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_CY_
03-27-2009, 04:05 AM
anyone using a Kubota W5021 walk behind mower?

this mower is built like a tank... shaft driven rear wheel drive...

http://home.tulsaconnect.com/toug/cpf/kubota2.JPG

WH401
03-27-2009, 08:55 AM
I have one and you are correct, they are definitely built like tanks. Mine isn't the self propelled version so it can get pretty heavy to push when the bag is full. It runs great though and never fails to start no matter how long it has sat for. Too bad Kubota doesn't market them in the US anymore, but the parts for them are readily available. If you ever find another don't let it go, these things are indestructible, a true commercial mower if there ever was one.

_CY_
03-28-2009, 09:47 PM
thanks for the feedback... can't seem to find anyone local that's even heard of a Kubota push mower... including the Kubota dealer.

mine starts very easy too... shaft rear drive is the bomb!
peels out... everything about W5021 is overbuilt.

just about done taking care of all the maintenance items. should be good to go for several more seasons!

how's the grass bagger... any good?
didn't get one with mower... can order one for $81...

WH401
03-29-2009, 02:08 PM
The bagger works well picking up clippings and also piles of leaves. It's almost a necessity with these mowers since they don't have a side discharge.

d22butler
03-29-2009, 03:02 PM
I have one and you are correct, they are definitely built like tanks. Mine isn't the self propelled version so it can get pretty heavy to push when the bag is full. It runs great though and never fails to start no matter how long it has sat for. Too bad Kubota doesn't market them in the US anymore, but the parts for them are readily available. If you ever find another don't let it go, these things are indestructible, a true commercial mower if there ever was one.

I have this model and cannot find an air filter or spark plug designed for this model ANYWHERE! Thanks in advance for your help!
Mike
doogielangley@yahoo.com

WH401
03-29-2009, 05:14 PM
I have this model and cannot find an air filter or spark plug designed for this model ANYWHERE! Thanks in advance for your help!
Mike
doogielangley@yahoo.com

Have you checked the Kubota dealer?, I know they can order the parts, at least mine can.

lilweeds
03-29-2009, 08:28 PM
Yes and if you can't get them I will buy it from you.

silver_fox
05-26-2009, 04:45 PM
I bought a new Kubota W5021 about 15 years ago, best walk behind mower ever built! Still works like new, never given me a lick of trouble. The turbo fan really assists in throwing the grass which in turn packs it in tighter to fit more in the bag. The curved handle makes it the most ergonomically comfortable mower.

So far this thing is bullet proof, but I did recently buy extra blades, air filters and another bag just in case Kubota stops stocking parts for it.

I still have the full color brochure from when I bought it, I'll try to scan it and post it. The W series came in two sizes the W5019 (19") or the W5021 (21"), and you could get it with or without the blade clutch and with or without self propelled. Mine has self propelled and the blade clutch. The "residential" version is what I have and it's better built and engineered than other commercial mowers, Kubota also had the "commercial version which had steel wheels that were also taller than the plastic residential model. The commercial model also had a larger fuel tank and the catcher bag was black instead of white.

It's a shame that Kubota never sold enough of these to warrant a continued production of them, not only are they build tough they also look good (if a mower can look good).

silver_fox
05-26-2009, 07:49 PM
Found the brochure and manual from when I bought it, May 1996. These are scans, sorry for the poor quality.

http://i2.photobucket.com/albums/y21/1silver_fox/Kubotabrochurepg1.jpg

http://i2.photobucket.com/albums/y21/1silver_fox/kubotabrochurepg2.png

http://i2.photobucket.com/albums/y21/1silver_fox/kubotabrochurepg3.jpg

http://i2.photobucket.com/albums/y21/1silver_fox/kubotabrochurepg4.jpg

http://i2.photobucket.com/albums/y21/1silver_fox/kubotaspecs.jpg

Benji
06-24-2009, 10:26 AM
Hi, all the Kubota owners. I have recently found the following web sites to order tires, blade, and handle lock bolts. It was so easy to find every part I was looking for. After more than 15 years of use, I had changed the oil only once. But I finally made the second oil change this summer.

Good luck you all!!

1. Go to the following website to download the parts list for W5021-PC:
http://www.box.net/shared/re8xraul55

2. Enter the part number(s) at the following website address:
http://www.tractorsmart.com/PartsBooksKubota/KubotaPriceList.asp

3. Type in the part number, and follow the instructions to order.

4. Manuals -- Parts manual number: 97898-40020; Shop manual number: 97897-10485; and, Owner's manual number: 65651-62912 – Type them in to order.

ParkerGray
06-30-2009, 08:09 AM
Benji, SilverFox, et al. Based largely on your positive comments and all the helpful info you provided, I just bought a W5021 push commercial model in very good condition and joined this forum. My question is whether or not there is a blade - such as the gator-type - that would improve mulching action? Thanks in advance. Parker

tjski
08-31-2009, 01:41 AM
I need to find out the compression ratio of the motor is. Mine smokes sometimes but it more of a white smoke.

kabrac
08-31-2009, 03:04 PM
Benji, SilverFox, et al. Based largely on your positive comments and all the helpful info you provided, I just bought a W5021 push commercial model in very good condition and joined this forum. My question is whether or not there is a blade - such as the gator-type - that would improve mulching action? Thanks in advance. Parker

Where did you get it and how much was it?

ParkerGray
08-31-2009, 05:39 PM
I bought it here in New Brunswick, Canada, from a mechanic who worked for a lawn mower dealer - it had been traded in. The mower is great - and in virtually new shape - but I wish it was self propelled. I would be willing to buy an old self-propelled to scavenge the parts or possibly sell this one for $325. Parker

kabrac
08-31-2009, 09:24 PM
I bought it here in New Brunswick, Canada, from a mechanic who worked for a lawn mower dealer - it had been traded in. The mower is great - and in virtually new shape - but I wish it was self propelled. I would be willing to buy an old self-propelled to scavenge the parts or possibly sell this one for $325. Parker

Is it the 19" or 21"? Does it have the bagger? Got any pictures? I might be interested. PM me with any info. How much would you say it weighs?

grassman177
08-31-2009, 11:20 PM
tha brochure is the worst i have ever seen, that lady is horrible looking. wow! i am a kubota fan and i do remember these at the dealer long ago and wish i had one as good as the other equipment is

sr20det
06-10-2010, 11:34 PM
i just received a Kubota W5019 ( blade clutch, but no self-propel) and its missing the grass catcher bag. Does anyone know the Kubota part number for this?! Parts are extremely hard to find.. thanks.

lalawn
07-26-2010, 02:03 AM
I recently found parts listed for my W5021SC @ searspartsdirect.com. I simply entered the model number and looked through all of the different parts groups.

erobinson32
08-01-2010, 11:05 PM
Just got a W5021-SC. Had been sitting in my grand father-in-law's storage shed, untouched for at least 5 years. He still has the original receipt, sales brochure, and operators manual in pristine condition. He purchased it in April of 1989. Has a brand new carb and new wheels, but still needs a bit of work. I'm taking it to the Kubota dealer this week for some service. Working pretty well, but wants to cut off when I engage the auto-drive.

I can scan the manual or brochure if anyone would like a copy. I also have a bunch more pictures if anyone is interested.

http://imgur.com/Dql05.jpg

http://imgur.com/Obk7P.jpg

http://imgur.com/imiEw.jpg

http://imgur.com/8HThn.jpg

93Chevy
08-01-2010, 11:26 PM
Man, I'd love to get my hands on one of those.

erobinson32
08-01-2010, 11:49 PM
Man, I'd love to get my hands on one of those.

could be in luck.

http://pittsburgh.craigslist.org/grd/1814960016.html

What are the chances, I just searched all of craigslist and there were only about 3 that came up, but one was in Pittsburgh

93Chevy
08-01-2010, 11:57 PM
could be in luck.

http://pittsburgh.craigslist.org/grd/1814960016.html

What are the chances, I just searched all of craigslist and there were only about 3 that came up, but one was in Pittsburgh

Holy crap, I may sell my Snapper 21" and get that...Thanks for the link.

erobinson32
08-03-2010, 10:12 AM
Holy crap, I may sell my Snapper 21" and get that...Thanks for the link.

Any luck with that craigslist post?

erobinson32
08-03-2010, 10:20 AM
Here's the sales brochure I got the other day. I also have the operators manual if anyone is interested, but I'm not going to take the time to scan it unless someone is interested. It looks to be about 20 pages.

W5021 Sales Brochure (http://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxlcm9iaW5zb24zMnxneDoyOTM5NjdhZjUwMDJkNmY0)

RIGGZY8
08-04-2010, 07:39 PM
IF YOU COULD SEND ME A PDF OR POST THE MANUAL THAT WOULD BE AMAZING. i CANT FIND ONE ANYWHERE.

93Chevy
08-04-2010, 07:52 PM
Any luck with that craigslist post?

No, I should be content with my current Snapper 21.

Yard-Dawg
08-04-2010, 09:57 PM
For those fellows looking for a bagger for this mower, I think it is the same bag as what Ariens uses on the 911 and PRO-21 mowers.

The deck design where the bag mounts looks the very same as my PRO-21 Ariens....might be worth looking into an Ariens bag for your Kabota mower?

erobinson32
08-11-2010, 05:35 PM
So my W5021's been in the shop for about a week. (local kubota dealer) I am being told that I might need to have a complete rebuild of the engine. Anyone have any clue what this is (or should) cost me? Is is worth it for a 21 yr old mower?

This all started because the mower would cut off when the auto-drive was engaged. It'll mow just fine, but it chokes up and loses power with auto-drive engages.

tjski
08-25-2010, 10:35 PM
I just bought another kubota w5021 sc. What a great lawn mower its a shame they don't build mowers like this anymore. I paid $50 for it, the machine was missing the bagger. *trucewhiteflag*

stevehunter
09-19-2010, 01:49 PM
Hi I would be interested in any manuals you have on the kubota mower. If you could send post them or email me them I would be grateful. Thanks stevehunter121@yahoo.com

cs9530
09-21-2010, 09:46 PM
Hi I would be interested in any manuals you have on the kubota mower. If you could send post them or email me them I would be grateful. Thanks stevehunter121@yahoo.com

Are you looking for the owners manual or the shop manual? I bought the shop manual years ago Ė itís in paper. Is there anything in particular youíre looking for? I could email/post scanned pages.

stevehunter
09-21-2010, 11:02 PM
I am looking for the shop manual. If its not to much to ask. I was looking for a parts list / break down or anything you could send me would be great. Thank you

erobinson32
09-22-2010, 09:47 AM
This isn't the shop manual, but it's a pretty detailed parts list for the W5021. There's also one for the W5019 if you search for it.

http://www.searspartsdirect.com/partsdirect/part-model/Kubota-Parts/Walk-behind-lawn-mower-Parts/Model-W5021SC/1320/1500600?searchedModel=W5021&blt=

cs9530
09-22-2010, 10:30 AM
I am looking for the shop manual. If its not to much to ask. I was looking for a parts list / break down or anything you could send me would be great. Thank you

I will take a look tonight. Its been a while since I looked through it bit I remember following pictorial on valve adjustment. The first page of this thread has links to a great parts site. I believe they have some parts breakdowns.

I'll see what the shop manual has in it.
Posted via Mobile Device

cs9530
09-22-2010, 09:10 PM
I dug out the manual tonight. It's really more procedural/specification oriented. Their are parts blowups but they're split up by mechanism.

The strength of the manual is that it gives procedures for disassembly, torque specs, etc.

I scanned the first few pages including the TOC. If there's a specific section you need, I'm more than happy to scan and post...just let me know.

tjski
09-23-2010, 12:23 AM
cs9530 could you scan the pages that give the specs on the head bolt torque values. I'm replacing the head and any pages that pertain to the removal and installation of the head would be great.

Thanks Todd

stevehunter
09-23-2010, 10:31 PM
If its not to much to ask could you scan the engine, transmission, and the troubleshooting sections? I would really appreciate it. No hurry if you are busy. Thanks again







I dug out the manual tonight. It's really more procedural/specification oriented. Their are parts blowups but they're split up by mechanism.

The strength of the manual is that it gives procedures for disassembly, torque specs, etc.

I scanned the first few pages including the TOC. If there's a specific section you need, I'm more than happy to scan and post...just let me know.

cs9530
09-23-2010, 10:45 PM
I scanned the Disassembling and Reassembling sections of the Engine chapter. I didn't do the Servicing section but if you need it, let me know. It basically covers checking the serviceability (tolerances) of the main engine parts.

Another note - the manual is in three languages - I copied only English which is why the pages skip.

I'll get the transmission section uploaded shortly.

Chris

cs9530
09-23-2010, 11:00 PM
Here are the Transmission and Troubleshooting sections.

auslk
04-04-2011, 02:49 PM
Has anybody came up with a better way to drain the oil from the mower, rather than tipping the mower up on 2 wheels and removing the drain plug? I always get oil all over the deck when I try this. We need some kind of drain connection extension with an inline valve and hose barb for tubing to attach to.

erobinson32
04-04-2011, 05:30 PM
I have one of these bad boys that I don't know what to do with. See Pictures Here (http://www.lawnsite.com/showpost.php?p=3664222&postcount=19)
I had issues with the auto-drive working towards the end of last year, and then it wouldn't crank at all. I took it to the Kubota service shop here in town (I'm about certain they are crooks) and they took several full months just to tell me that they were positive it'd cost me well over the $300 I told them I wanted to spend on it. So, they haven't even touched it yet.

Any suggestions? I'm about ready to post it for sale, and just buy a new Honda. However, I'm in love with this thing and don't want to give up on it quite yet.

Chevy z71
04-04-2011, 06:03 PM
These are tanks just like the silver decks.

erobinson32
04-04-2011, 09:41 PM
Went ahead and pulled the trigger this evening. Got a Honda HRX217HXA. Looking forward to testing it out tomorrow if the weather holds up. Now, what to do with the Kubota. I'm weighing putting it on Craigslist vs making it a hobby project for me to take on over the summer. I'd love to get it back up and running again.

However, if anyone is interested in purchasing let me know. I'd consider reasonable offers for it. Again, I don't know what's exactly is wrong with it, but it won't start at all. Has a fresh Carb (<1yr) and new wheels. Comes with a bag, side discharge and spare air filter. Still have the manual too.

kubotaw5021
05-06-2011, 12:20 PM
This message is for erobinson32...
Still have the kubota w 5021?? if you do . do you want to sale it for parts??
i need the cylinder head, and carburator.
let me know

Mikegyver
05-06-2011, 07:28 PM
For some reason it reminds me of a older honda hrc 216 I have...
mike

_CY_
05-15-2011, 09:22 PM
CS9530 ... many thanks for all the scans of the manual.

my Kubota has been running great with no issues.

not counting leaving gas in tank over the season. took carb apart and cleaned out all orifices...
runs good again. next season I'm shutting fuel, then idling dry.

hawkeye56
05-30-2011, 12:52 AM
I recently bought a used 21 inch self propelled model the engine runs good and the transmission is strong but the blade will not engage any suggestions diagrams info etc. would be greatly appreciated. could the blade clutch be converted to direcf drive?

DejaVu
07-03-2011, 01:10 AM
My uncle has two of these (a W5021 and a W5019), he is working on rebuilding the engine and asked if I could find the service manual for him. After a fruitless search online, I contacted our local Kubota dealer and they were very helpful, providing me with the manuals in PDF format.

I figured the manuals might be helpful to many others as well that own these aging workhorse mowers so I decided to share them.

Operator's Manual - W5019/W5021 (http://www.qooy.com/files/6RXZYTNEDR/Operator_s_Manual_-_W5019_W5021.pdf)
Parts List - W5019 (http://www.qooy.com/files/F0DMUDAKEK/Parts_List_-_W5019.pdf)
Parts List - W5021 (http://www.qooy.com/files/0JKYJ9PUSP/Parts_List_-_W5021.pdf)
Workshop Manual - W5019/W5021 (Mirror #1) (http://www.qooy.com/files/FAKFS2K4GS/Workshop_Manual_-_W5019_W5021.pdf)
Workshop Manual - W5019/W5021 (Mirror #2) (http://hotfile.com/dl/122868453/a68376f/Workshop_Manual_-_W5019_W5021.pdf.html)

Long live these mowers, they were a great product and it's too bad that Kubota no longer carries them in the North American market.

*trucewhiteflag*

Jedward
07-06-2011, 08:41 PM
Went ahead and pulled the trigger this evening. Got a Honda HRX217HXA. Looking forward to testing it out tomorrow if the weather holds up. Now, what to do with the Kubota. I'm weighing putting it on Craigslist vs making it a hobby project for me to take on over the summer. I'd love to get it back up and running again.

However, if anyone is interested in purchasing let me know. I'd consider reasonable offers for it. Again, I don't know what's exactly is wrong with it, but it won't start at all. Has a fresh Carb (<1yr) and new wheels. Comes with a bag, side discharge and spare air filter. Still have the manual too.
Posted via Mobile Device

Jedward
07-06-2011, 10:26 PM
Would you be willing to sell the bag and frame only?

Thanks
Posted via Mobile Device

Peter_R
07-07-2011, 10:07 PM
This Messaghe is for erobinson32

Would you be willing to sell the transmission assembly and tires?

Peter_R
07-08-2011, 08:11 PM
Having been the proud owner of a hard working Kubota 5021SC for about 20 years...the drive bar from the transmission to the left rear tire snapped. I needed to either fix or replace quickly...have replaced with a Toro 50197. Let me know if anyone is in need of Kubota parts...I am willing to part out my faithful old mower to good homes.

JeepZJ
07-25-2011, 11:41 PM
Peter

What is the condition of the tires on that old war horse. I've worn mine out and am in need of some fresh rubber.

Peter_R
07-26-2011, 08:54 AM
Hello,

The tires are aftermarket (not Kubota), I think I paid $9 a piece 4 or 5 years ago at a mower shop. I recall the guy saying they were interchangeable with Honda. They are aftermarket and they look it but they worked.

Anything else on the mower you may be interested in? The engine is very strong, I have taken good care of the mower over the years.

PEIMike
07-30-2011, 10:04 AM
Peter, would you be willing to sell the tranny?
mine is slipping in and out of gear, and i could probably make a good one out of the two.

Peter_R
08-01-2011, 08:46 AM
Hello Mike,

I am willing to sell the transmission.

Peter
281-610-8932

Fire/Grass
11-17-2011, 08:18 AM
Guys. I hate to bring up an old post. I found one of these on Craigslist. Guy says it needs a tune up and the throttle cable is bad. He says the tranny will still pull a car up a hill. I offered him $40 dollars and he accepted. He says that he left it outside in the rain in the spring and since it has ran ruff. He thought it might of got water in the gas? He claims he is original owner, but not sure which year he purchased.

What do you think?

W&Wlawncare
11-17-2011, 03:35 PM
Fire/Grass- Are you buying for parts or to use? It sounds like it needs a lot of work and the repair bill will add up quickly. Does it come with a bag? If it doesn't have the bag it's pretty much worthless

tinkerman
11-19-2011, 02:10 PM
Hey I'm new to the site I went and got that mower 40 bucks.It needed a good cleaning it didn't have the bag but it did have the mulch plug.I got it to run but it needs the carb cleaned and could use a blade clutch cable and some tires but it all works.I have a old honda hr214 that looks almost the same with the shaft drive rear end the same tires and a few other things. I will get it back in shape just need to find a bag and some other parts maybe I will find them here.

tinkerman
11-19-2011, 02:13 PM
I'm new to the site.Do you have the bag? and what do you want for the motor.Thanks Jeff

dublinohio
05-14-2012, 05:49 PM
Looking for wheels and berrings for w5021 anyone have suggestions other than buy new for 96.00 each? Cant justify spending 400 on new wheels for something I still have to push event though it runs like a tank and is the best mower I have ever had!!

Peter_R
05-14-2012, 08:58 PM
Hello,

I got rid of the faithful Kubota a couple of months back...I sold the bag and frame for $100 (I think)...sounds like you got a heck of a find.

fumblefingers
08-15-2012, 11:49 PM
I dug out the manual tonight. It's really more procedural/specification oriented. Their are parts blowups but they're split up by mechanism.

The strength of the manual is that it gives procedures for disassembly, torque specs, etc.

I scanned the first few pages including the TOC. If there's a specific section you need, I'm more than happy to scan and post...just let me know.

I would like to have pages S 93 and S 105 if it would not be too much trouble.
Thanks

fumblefingers
08-16-2012, 04:41 PM
Hey guys, I am rehabing a Kubota W5021 which I gave to my daughter 15 years ago. She abused this tank of a mower. The carb was in miserable shape but I may be able to find a replacement. It is a Mikuni and I have tried cleaning but no luck (yet). She also let the mower sit outside and the blade clutch is semi frozen so I want to disassemble and work the parts. I see on another post about the service manual that page 93 covers the carb and page 105 covers disassembling of the blade clutch. I note on the bottom that there is 2 14mm bolts holding on to the blade and 4 10 mm bolts that hold the housing in place, but don't want to go further without knowing what I am doing. Any help would be appreciated

treysoucie
08-16-2012, 05:45 PM
After today I will have 3 of these gems sitting in my garage. I need to buy a service manual asap.

Fumble- I wish I had your patience... My philosophy entails tearing down first, hoping I can put it back together afterwards. ha

fumblefingers
08-16-2012, 06:55 PM
The Carb is held on with 2 10mm nuts and one 10 mm bolt that also serves to hold the air filter in place. One also needs a 8mm wrench to loosen the throttle lever but the choke lever simply detaches from the governor. Be sure to cut off the fuel flow from the tank before pulling off the fuel line. A little WD40 helps slide it off. There also is a tube that attaches to the air filter with a finger clamp.
After removal the bottom bowl can be removed with a 14mm wrench exposing the float, float pin and main jet. The float and valve pin are held in place with a cross pin that can be pressed out. be careful as the cross pin has an almost invisible retaining wire clip so I suggest that the carb be pulled apart in a bucket. The main jet can be unscrewed from the nozzle. Further disassembly is not advised but soaking the parts and carb in a bucket of cleaner and then run a tiny wire through the main jet can be done. If one is careful and not break the bowl O ring seal, it can be reused.

treysoucie
08-18-2012, 02:32 AM
Do you know the model of the mikuni Carb on these things? I just got my 5021 I was using for parts to fire up and run... it had a swapped craptsman cheapo Carb on it. I would rather try to find one based on the model number rather than pay a premium for the kubota specific mikuni at Sears parts.
Posted via Mobile Device

fumblefingers
08-18-2012, 09:57 AM
no there is no model number and I only have the replacement part number from Sears. My carb is still clogged (I think). I did clean the main jet and the fuel inlet and float valve and also polished the bottom of the float bowl with emory cloth. The engine still won't start. Since the blade clutch brake is so stiff, I am wondering if there is a hidden cut off switch that is preventing fire to the spark (although I did run a wire from the spark cable to the frame and observed a spark). I am stubborn though and will, if necessary, remove all plastic then soak the carb in cleaner completely immersed. I did notice a rubber tube that comes out of the top of the carb that is not attached to anything. I don't see where the other end is supposed to go.....any ideas?
No one as of yet has offered the pages of the service manual that deals with the carb and the brake clutch. I see one member has scanned and posted before but don't know how to contact him through this forum???:cry: Pages 93 and 105 would be a big help

fumblefingers
08-18-2012, 03:04 PM
Since I had a little time today I again looked at the carb. There is a vacuum line that comes out of the top of the carb and there is also a hose that comes off of the side of the engine.......but that line looks like it goes to the bottom nipple on the air filter housing.
When I insert the vacuum line from the carb into the line from the engine and then remove the spark plug, I get a huge spray of raw gas that comes through the spark pug hole. This leads me to believe that the float in the carb is foo bar and the float level for gas is way too high.
To my way of thinking, the carb vacuum line and the air intake barb are some how screwed up. Can any one verify how these are supposed to be by looking at your W5021? thanks

treysoucie
08-18-2012, 07:50 PM
If I can find a service manual in pdf. I'll buy it and share. There are no tubes on my carbs other than the fuel line in... I see that the mikuni m21zmr carbs look very similar to ours
Posted via Mobile Device

treysoucie
08-18-2012, 07:51 PM
I believe the crank breather tube gets plumbed into the air box intake.
Posted via Mobile Device

treysoucie
08-18-2012, 08:11 PM
http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120817_135421.jpg

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120817_135348.jpg
http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120817_135238.jpg

I do not see any vacuum lines running to my carbs

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_175415.jpg

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_175342.jpg


Here is my 30 dollar find. W5021pc. It has a cheapo muffler retrofit. I managed to get it running. No smoke so I think it can be saved nicely. I'll strip and repaint the deck. Get a new OEM Carb and fix the pull start. It will also need new cables.

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_180311.jpg

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_180254.jpg

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_180234.jpg


http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_180330.jpg

http://i530.photobucket.com/albums/dd342/p0opstlnksal0t/20120818_180400.jpg
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TriCountyLawn
08-18-2012, 08:26 PM
I didnt know Kubota walk behind mowers even existed.

treysoucie
08-18-2012, 08:55 PM
I was unaware as well. That was until I started searching for reviews on the Honda commercial walk behind. I was led onto these little gems and now I have a bit of an addiction with them. I fired up my 5021 walk behind today for the first time. I let my parents yard get pretty bad due to being mowerless the last . It was 1-2 feet in length and this kubota with side discharge mowed through it without so much as a hiccup. It's about 2/3 of an acre and took me roughly 3 hours to mow. It was actually a fun chore with this little tank. Huge weeds and baby pines trees were no match for this fine piece of Japanese machinery. I may turn this 5021 pc into a yard vacuum. It's amazing what this Turbo suction mower picks up!
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treysoucie
08-18-2012, 08:57 PM
Sorry for the humongous pictures. I thought they would resize.
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fumblefingers
08-18-2012, 09:18 PM
Thanks for the nice pictures. It appears that the carb are similiar but I see on one a tube to no where that comes out of the top of the carb and hangs down (up) that is not on your carb. Also the air filter on yours has been replaced with a yellow contraption and the line from the engine is not attached to anything.
My W5021 has an extra handle and cable that is used to engage the blade and is listed as a brake clutch. Yours has the transmission drive handle.

I believe I bought this mower in 1991 new from Sears and it was at a close out price of about $375. I gave it to my daughter as I do my heavy mowing with my Kubota 7610 bush hog, and my John Deer 345 both HST drives. I could use the W5021 for tight places. The 2 speed transmission is still good.

Sears list a replacement part number for the float but their web site says call for availability. I did not notice any gas in the float when I took it off to clean the valve but then since it is plastic, it may have swelled slightly and binding as it tries to push the valve pin into it's seat. I did scrape the varnish away from the rectangular sides of the valve pin but maybe there is still some residue that is keeping the pin from seating firmly.

fumblefingers
08-18-2012, 09:40 PM
I will have the carb and clutch brake pages from the Service manual soon and will share. Will also look at the Mikuni M21zmr

fumblefingers
08-18-2012, 09:52 PM
woops, I ment to say you have the blade clutch but I don't see the self propel transmission handle and cable :o

fumblefingers
08-18-2012, 09:57 PM
I didnt know Kubota walk behind mowers even existed.

Mine is a 1991 and I believe they made them for only 2 years as they were expensive. In 91 they cost retail for over $500 which was a lot of $ in '91 terms. I got mine on sale.

TriCountyLawn
08-18-2012, 10:06 PM
Upon searching for these mowers I ended up on kubotas europe site or something and they had some mowers and options not available in the states. There was a bad azz front mount with a big catcher on the back that was like a walker power dump.

treysoucie
08-18-2012, 10:26 PM
Fumble the last 5 pics show the 5021 pc which is not self propelled. I pucked it up for 30 bucks locally and it had some no name brand Carb swapped on it. The first pics are of the other self propelled 5021 which is the original mikuni. That Carb does not have a hose coming off the top either. Can you post a pic of your carburetor? Also did you run a thin wire through the pilot jet as well as the main jet? The pilot is what controls the fuel through the low speed circuit( startup and idle) the main jet isn't usually activated until about 1/8 throttle and up. With a clogged pilot it may not start or idle.

Minors also made a cw1336 which was a 36" commercial walk behind. A true beauty and bullet proof machine
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treysoucie
08-18-2012, 10:39 PM
Kubota I mean

Fumble do you have the manual on PDF?

kubota makes the w521 w621 and w721 overseas I believe

fumblefingers
08-19-2012, 11:38 AM
Kubota I mean

Fumble do you have the manual on PDF?

kubota makes the w521 w621 and w721 overseas I believe

no but some of the members here do have service manuals and are willing to scan and share pages. The manual is too big for them to be bothered by scanning the whole thing at once so some of the pages and the index have been previously been this thread. I would suggest anyone interested to down load these pages.

fumblefingers
08-19-2012, 12:58 PM
http://s1264.photobucket.com/albums/jj485/fumblefingers/

treysoucie
08-19-2012, 01:04 PM
I purchased a paper back manual on eBay last night. I could not find a PDF.
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fumblefingers
08-19-2012, 01:05 PM
http://i1264.photobucket.com/albums/jj485/fumblefingers/4c9546e2.jpg http://i1264.photobucket.com/albums/jj485/fumblefingers/4c9546e2.jpg How do you post picture. I put on photobucket but it does not show up?????

fumblefingers
08-19-2012, 01:16 PM
http://i1264.photobucket.com/albums/jj485/fumblefingers/818eec11.jpg

treysoucie
08-19-2012, 01:21 PM
I see. Neither of my current mowers have this line. It is probably a bowl overflow. It does not appear to be a vacuum line. I think that line is meant to dangle down only. Without a shop manual I can only guess
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fumblefingers
08-19-2012, 01:21 PM
finally got 2 pix to post. The tube I am talking about does not appear to attach to anything that I can find unless something is broken off. The tube that comes down from the air filter provides a suction and it would seem that the tube from the top back of the carb would also be used to draw fuel into a dry carb at start. The usage of the tube has me puzzled.

fumblefingers
08-19-2012, 01:26 PM
http://i1264.photobucket.com/albums/jj485/fumblefingers/58f1feb6.jpg
Here is a better picture

fumblefingers
08-19-2012, 01:32 PM
I want to set the throttle lever in the proper position. Please put your mower in the run position and let me know where the 8mm linkage nut is in in the slide position. The nut I am referring to is best seen in picture 1

fumblefingers
08-19-2012, 02:05 PM
http://i1264.photobucket.com/albums/jj485/fumblefingers/098534d6.jpgTop view with air filter out

cs9530
08-19-2012, 03:35 PM
I would like to have pages S 93 and S 105 if it would not be too much trouble.
Thanks

Here are pages 93 and 105 - hope this helps...

fumblefingers
08-19-2012, 03:58 PM
Here are pages 93 and 105 - hope this helps...

Thanks a lot. I also see page 51 is mentioned about the blade clutch. Could you add.

treysoucie
08-19-2012, 04:02 PM
OK I'll snap a pic of the linkage in choke, low throttle and high throttle
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treysoucie
08-19-2012, 04:05 PM
My non self propelled bogs down and dies if I apply the clutch too fast. If I apply the clutch very slowly it stays running. I may need to rip the clutch apart and check for corrosion or improper bearing wear
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fumblefingers
08-19-2012, 04:25 PM
I pulled the carb and cleaned again. This time I pulled the pilot jet and sprayed the hell out of it because I did not have a tiny wire. Then I put carb back, put the throttle in run and pulled the starter. the mower started and ran for15 seconds then ran out of gas (empty tank):0
It is too ot to mess with this any more today :)

cs9530
08-19-2012, 04:26 PM
Thanks a lot. I also see page 51 is mentioned about the blade clutch. Could you add.

Here's page 51.

treysoucie
08-19-2012, 04:35 PM
Sounds promising. Usually when people have starting and idling issues 9times out of ten it's the pilot that's gunked up.
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cs9530
08-19-2012, 07:58 PM
Here's page 51.

Here's the S.2 Mower Blade Clutch and Blade (all three pages).

fumblefingers
08-19-2012, 09:33 PM
Sounds promising. Usually when people have starting and idling issues 9times out of ten it's the pilot that's gunked up.
Posted via Mobile Device The service manual sure helps. After viewing the pages from CS95 I see I put the float spring in wrong. Tomorrow, I will pull the carb apart again.

I am glad I have a air wrench to remove the blade. When I am sure the engine runs correctly, I will overhaul the blade clutch then check the valve clearance.

treysoucie
08-19-2012, 10:12 PM
I just picked up a paper manual. I'll have to check the clearances and such on the clutch. I have a feeling it not gonna be cheap to get my non propelled 5021 back to OEM specs. I may strip it down entirely. Repair t it. Sandblast what I can and put her back together. It will make a nice yard vacuum I think
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fumblefingers
08-20-2012, 09:47 AM
If you are careful a ot of times you can rehab parts. Don't forget to send a pix of your throttle settings :)

fumblefingers
08-20-2012, 06:37 PM
Got some gas today and engine started with one pull but ran too fast and flooded. Pulled spark plug and confirmed so guess I will try to find a float and needle valve. Grrr. Would not start again even after drying plug. I did not change any of the carb adjustments as they were ok 15 months ago.

treysoucie
08-20-2012, 06:45 PM
I will try to get you pics tonight... Does the float and needle valve look bad? are the floats set to OEM Spec? Have you messed with the idle air screw at all (it may me a fuel screw, if the adj. screw is upstream of the pilot circuit it is an air screw, if its downstream its a fuel screw)?

fumblefingers
08-20-2012, 07:08 PM
I will try to get you pics tonight... Does the float and needle valve look bad? are the floats set to OEM Spec? Have you messed with the idle air screw at all (it may me a fuel screw, if the adj. screw is upstream of the pilot circuit it is an air screw, if its downstream its a fuel screw)? The float is plastic and has no adjustment. I did not mess with any of the screws. I do not hhave any of the adjustment procedures for the sccrews but assume they were ok as when the unit was running they had been set (unless someone turned them when trying to start mower for my daughter)
The only parts I removed were the pilot jet, main jet, plastic choke pickup tube, float, float pin, float spring. Then carb cleaner. Since the engine ran so fast for 5 seconds before shutting down, I assume the governor had something to do with it.

If the float pin is not adequately sealing the carb, the chamber level will be too high causing flooding. I have just one page about the carb and it deals only with cleaning jets and float chamber. If you have more I would appreciate it

treysoucie
08-20-2012, 07:20 PM
See if this link works...

http://www.tradebit.com/softlinks/9858950-Kubota_W5019_W5021_Walk_Behind_Mower_Workshop_Service_Manual.pdf


or...

http://www.fileswap.com/dl/0J7JbBgrjk/

treysoucie
08-20-2012, 07:43 PM
http://dl12.fileswap.com/download/?id=oIDPdprIvSNsApTdYnC%2F3zUbcte5NEvFGmzeYBKOf1ZLaujLu9S5x295%2BpJgys8UIUz6F4Q%2B%2BjDAKFryyh%2Fr6f mlwgHsnh%2BNtWooEGhsn3fY6N2PSfWLGlQTrstwkFRAwPF4XurwKqBRTdbvMWNn5dUV2DagpGlbOQBoSWG5bS37JW3GOaDmLrn4 85TlDJ6qptq4FeNbXA%2FmJfMwdIRmGQ%3D%3D&h=f93d52a5f7279881a9dfbd5a91b7e39c&t=5032c478

fumblefingers
08-20-2012, 08:00 PM
See if this link works...

http://www.tradebit.com/softlinks/9858950-Kubota_W5019_W5021_Walk_Behind_Mower_Workshop_Service_Manual.pdf


or...

http://www.fileswap.com/dl/0J7JbBgrjk/

Thank you I see how to set the choke now but have not found the adjustment screws setting yet. Not sure which screw is which.

fumblefingers
08-20-2012, 08:20 PM
http://dl12.fileswap.com/download/?id=oIDPdprIvSNsApTdYnC%2F3zUbcte5NEvFGmzeYBKOf1ZLaujLu9S5x295%2BpJgys8UIUz6F4Q%2B%2BjDAKFryyh%2Fr6f mlwgHsnh%2BNtWooEGhsn3fY6N2PSfWLGlQTrstwkFRAwPF4XurwKqBRTdbvMWNn5dUV2DagpGlbOQBoSWG5bS37JW3GOaDmLrn4 85TlDJ6qptq4FeNbXA%2FmJfMwdIRmGQ%3D%3D&h=f93d52a5f7279881a9dfbd5a91b7e39c&t=5032c478 This download gives me a "forbidden" and will not load???

treysoucie
08-20-2012, 08:24 PM
Try my later link
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treysoucie
08-20-2012, 09:30 PM
Did you try this one? http://www.fileswap.com/dl/0J7JbBgrjk/
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fumblefingers
08-20-2012, 09:37 PM
Try my later link
Posted via Mobile DeviceThey both work Got the service manual. What is not listed in SM is the adjustment screws on the carb. I see the choke is set 2mm back from the edge on the govenor.

As I mentioned the carb was in really bad condition. I did not remove the nozzle that the main jet screws into so maybe I should try doing that but right now I think that the adjustment screws may be foo bar. Possibly the owners manual (which i don't have) identifies which screw is which and how to adjust. Do you have any idea's?

fumblefingers
08-20-2012, 09:40 PM
Did you try this one? http://www.fileswap.com/dl/0J7JbBgrjk/
Posted via Mobile Device That works also

fumblefingers
08-21-2012, 02:15 PM
pulled carb again today and had mower repair shop look at it. Since it is flooding, they say only float will cause this. The float shows no leakage and vacuum gauge shows closing against vacuum so they suggested, since the needle is steel and the seat is not changable, that I use q tip in drill and toothpaste on tip and try to polish the seat to remove varnish build up. At this point I will give it a try. The carb does NOT have a high speed adjustment but does have a low speed adjustment and a idle adjustment. They suggest that the low speed adjustent be started at 2 full turns then turned down in 1/8 increments when running.

treysoucie
08-21-2012, 05:54 PM
Keep me posted. I am out of town until Friday. When I get back I'll take some pics of the linkages
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fumblefingers
08-21-2012, 09:34 PM
The butterfly on this carb has a very weak spring and I noticed that the butterfly would snap closed when observed from the side as gravety helped pull the flap closed but when in the mounted position the butterfly did not move to closed. This was missed in the cleaning and the varnish could be heard with a squeek when manually working the flap. After another soaking in carb cleaner and manual manipulation at least 100 times the flap was better but not perfect. I guess 21 years of abuse has taken it's toll and varnish will come off in layers. It is easy to see why some give up and buy a new carb :dizzy:

treysoucie
08-21-2012, 10:36 PM
the best way to clean a carb is the old pine sol trick... soak the disassembled carb in pine sol over night... even better if you place a fish tank air stone in to agitate it... it will eat all varnish. google "pine sol carburetor"

fumblefingers
08-21-2012, 10:53 PM
the best way to clean a carb is the old pine sol trick... soak the disassembled carb in pine sol over night... even better if you place a fish tank air stone in to agitate it... it will eat all varnish. google "pine sol carburetor"

Thanks for the tip.

fumblefingers
08-22-2012, 03:08 PM
I got the butterfly to operate as it should then put the carb on and set the choke to specs. Engine started on first pull in choke and ran for a minute but when I put lever in run engine would run with surging fast then slow. When back in choke engine running without surge I did not try to remove the nozzle but that is the only thing that I can try to do now. I see on the Sears parts list that the nozzle is repaceable. Does it press out or screw out. I see nothing in the SM about this.

fumblefingers
08-22-2012, 04:01 PM
Woops......I uninstalled Adobe Reader X and installed Adobe Reader 9 then updated it to remove vulnerabiliities because it has a Find function. The Find found nozzle on the SM which gives a screw torque. So the answer is the nozzle screwss out.
I should have started this project when the grass quit growing :) With the mower running the transmission worked like a charm but not the blade clutch.

The next part of the project will be to remove the blade, disconnect the cables and pull the engine from the mower housing to overhaul the blade clutch. I want the engine running right first. This beast should be good for another 21 years

treysoucie
08-22-2012, 10:35 PM
Lol I found out this Carb on my 30 dollar w5021 is a walbro poulan weedeater Carb. I'm surprised it runs asgood as it does
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fumblefingers
08-23-2012, 08:00 PM
took carb apart again today but could not unscrew nozzle to clean as frozen in place and I would have to drill and use easy out to remove. Decided to try running before ordering parts so I Reassembled, and mower started on first pull on choke then afte 10 seconds switched to run. mower continued to run smoothly for 15 seconds then started the surging.

As soon as I engaged transmission, the mower took off and surging quit.

Tried to engage blade but no rotation. Shut down and pulled blade actuator against return spring with pinch bar (more leverage than cable) and worked back and forth a few times spraying with penetrating oil. Started up again but blade did not engage. Tightened cable and blade tried to engage but no luck. Shut down and rotated blade by hand. Very stiff turning.

Before, tearing down clutch system, I viewed SM which says actuator plates are forced togeather engaging lining on break holder. I assume this is something like a brake shoe material on an auto. When I looked this part up on Searsparts it says no longer available. RATS. Maybe, it would be worth a try to tear down and see if parts can be rehabed. This mower is too good to part out :wall:cry:

treysoucie
08-23-2012, 11:56 PM
Indeed. let me know how things turn out. You may be able to rig something for the friction clutch material
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fumblefingers
08-24-2012, 10:01 AM
hurricane on the way so need to put this away until fall. In meantime will search for parts.

One question though, When the engin starts it runs in choke with the normal putt putt and also for first 15 seconds then starts the surge, but when the transmission drive is engaged the engine powers up and the wheels turn so powerfully it takes off and engin runs normally, almost jerking the mower out of my hands. I am tempted to replace the pilot jet as I believe that it controls both low speed and mid range. Could the governor also need adjustment? It has never been altered from factory setting. Is the surge when sitting normal?

The engine does not quit.:confused:

D-Ray23
09-13-2012, 03:25 PM
I'm new to here, but I bought a W5021PC from Craigslist for $40.00. It looks almost new with no rust. The guy said it’s been setting for 2 years so I drained the very black oil out and drained the gas and replaced the sparkplug. I put Sea Foam in with the fresh gas and it started on the first pull. I was amazed! It smoked a little at first, but stopped after a few seconds. The only issue is the blade clutch. I pulled it apart and saw there is no pad left on the blade holding plate and Sears no longer carries that part. I bit the bullet and ordered the whole clutch assembly (167.00) but I think I made a good decision. $207.00 for a tank and several envious neighbors isn’t too bad. I’ll use it to vacuum leaves in the fall because this thing will suck the grubs right out of the ground. I am looking for a side discharge chute if anyone has one.

fumblefingers
09-13-2012, 03:59 PM
I got my 5021 running but waiting for cool weather to pull the clutch. Was there no way you could have had the clutch repaired? $200 is an ouch in this economy. Got any pictures of how hard it was to pull the clutch? I have a copy of the shop manual but it appears that after blade removal the whole engine needs to be pulled which means the transmission drive chain has to be pulled. Is their an easier way?

Right now if I start the engine it sort of hunts from slow to fast then slow but when I engage the transmission the mower jerks the handle out of my hand (almost) and drags me around the yard. When under load the engine smooths out. I am guessing that the fast slow fast engine speed has something to do with the govenor because the idle adjustment has no effect. What say you?

D-Ray23
09-19-2012, 06:24 PM
I was surprised how easy it was to pull the motor, but my mower isnít self propelled. I squirted WD40 on the mower shaft 3 or 4 times over several days and follow the instructions in the manual. The first plate that comes off is the one that has the brake pad type material and mine was completely down to the metal. Sears sold it for $67.00, but itís a discontinued item, so I bought the whole clutch assembly. Again, I was surprised how easy it was to put on, and it worked w/o any adjustment.
My experience is somewhat limited, but engine surging is usually caused by limited gas flow such as clogged jets in the carb, air filter, gas filter, gas cap ext.

fumblefingers
09-19-2012, 06:40 PM
I have cleaned the carb but I may order a pilot jet. The nozzel would have to be removed with an easyout as the brass tits are foobar so for now I will leave it alone. As I mentioned the governor slows the engin down. When I pulled the carb I noticed the governor butterfly not too smooth in operation but when I put some air wrench oil on the shaft it moved much better. The spring is tiny on the butterfy so that may be the problem, but as mentioned the engine starts on first pull and runs strong under load so I don't want to mess with the governor.

To get to the clutch, after blade removal I guess I could pull the 4 bolts on the housing. If I try to turn the blade by hand it is very stiff. The clutch cable is on the top side of the housing and the top of the clutch is splined so I guess you did not pull that part. I was hoping I could rivet some brake lining because I suspect that the lining is gone.

D-Ray23
09-23-2012, 10:05 PM
I have cleaned the carb but I may order a pilot jet. The nozzel would have to be removed with an easyout as the brass tits are foobar so for now I will leave it alone. As I mentioned the governor slows the engin down. When I pulled the carb I noticed the governor butterfly not too smooth in operation but when I put some air wrench oil on the shaft it moved much better. The spring is tiny on the butterfy so that may be the problem, but as mentioned the engine starts on first pull and runs strong under load so I don't want to mess with the governor.

To get to the clutch, after blade removal I guess I could pull the 4 bolts on the housing. If I try to turn the blade by hand it is very stiff. The clutch cable is on the top side of the housing and the top of the clutch is splined so I guess you did not pull that part. I was hoping I could rivet some brake lining because I suspect that the lining is gone.
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fumblefingers
06-13-2013, 05:43 PM
can you post pages S105. I have the clutch apart and I need to know if there is a feeler gauge setting between clutch plate and disc.
Thank you

fumblefingers
06-13-2013, 05:51 PM
I purchased a paper back manual on eBay last night. I could not find a PDF.
Posted via Mobile Device my computer crashed and I need page s105

jmartin919
06-27-2013, 10:46 AM
Just picked this up and am now going through it. Does anybody know how to tell the manufacture date?Is it coded into the serial number? The in-tank fuel filter seems like it will be a pain to maintain. Was thinking about doing away with it and just putting a filter in the fuel line. Any opinions on that? Also, does anybody have one that they are parting out?

charlesdjones1
07-22-2014, 11:26 PM
I bought a new Kubota W5021 about 15 years ago, best walk behind mower ever built! Still works like new, never given me a lick of trouble. The turbo fan really assists in throwing the grass which in turn packs it in tighter to fit more in the bag. The curved handle makes it the most ergonomically comfortable mower.

So far this thing is bullet proof, but I did recently buy extra blades, air filters and another bag just in case Kubota stops stocking parts for it.

I still have the full color brochure from when I bought it, I'll try to scan it and post it. The W series came in two sizes the W5019 (19") or the W5021 (21"), and you could get it with or without the blade clutch and with or without self propelled. Mine has self propelled and the blade clutch. The "residential" version is what I have and it's better built and engineered than other commercial mowers, Kubota also had the "commercial version which had steel wheels that were also taller than the plastic residential model. The commercial model also had a larger fuel tank and the catcher bag was black instead of white.

It's a shame that Kubota never sold enough of these to warrant a continued production of them, not only are they build tough they also look good (if a mower can look good).

Own the 5021 Commercial, has everything you mentioned but has the white Commercial catcher also. Built like a tank but handles like a Paladin, better handling newer and cheaper mowers out there, but still awesome for a 25 year old mower.
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