Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 06-26-2000, 08:27 PM
ddg ddg is offline
LawnSite Member
 
Join Date: Jun 2000
Location: Kansas City
Posts: 11
Still ZTR shopping, Had about decided on something with a shaft & gearbox driven deck, (Scag Turf Tiger) but have been hearing some negative stuff about it here. The anti-drive shaft people say go with an all belt drive, like Exmark Lazer. I've heard mechanical effeciency suffers with an all belt drive, and I've heard shaft drive sap horsepower too. Who do you believe? Is there a mechanical advantage with shafts over belts? I've used a super A farmall with an all belt drive Woods L-59 belly mower for 20 years with no problem, so I know a little about belt drives.
Reply With Quote
  #2  
Old 06-26-2000, 09:18 PM
osc osc is offline
LawnSite Senior Member
 
Join Date: Mar 2000
Location: southern ohio
Posts: 502
What is an ATR?
Reply With Quote
  #3  
Old 06-26-2000, 09:36 PM
Eric ELM Eric ELM is offline
Husband, Father, Friend, Angel
 
Join Date: Dec 1999
Location: Chicago, IL USA
Posts: 4,831
ddg: I've got a 430 20 HP diesel JD with shaft drive mid mount 60&quot; deck and it's noisy compared to belt drive. I've got an all belt drive (mule type drive)26 HP diesel Chopper with a 60&quot; deck. I think the all belt drive is nicer. <p>----------<br>&lt;a href=&quot;http://pages.prodigy.net/eric.erickson/&quot;&gt;Eric@ELM&lt;/a&gt;<br>The Grass is always Greener on the other side of my competitors fence
Reply With Quote
  #4  
Old 06-26-2000, 09:38 PM
Lazer Lazer is offline
LawnSite Bronze Member
 
Join Date: Jan 2000
Posts: 1,446
I think a shaft drive makes more sense, myself. I don't like the looks of the Lazer/Z-Master twisted, turning mower belt.<p>But they're almost trouble-free, so go figure.<p>I don't think I'd let it be the deciding factor.
Reply With Quote
  #5  
Old 06-26-2000, 10:23 PM
ddg ddg is offline
LawnSite Member
 
Join Date: Jun 2000
Location: Kansas City
Posts: 11
I guess my finger decided to use an A instead of a &quot;Z&quot;. Anyway I'm trying to figure out the selling points of both designs, and I think this is the place! I want a good, commercial grade mower to handle about 3 1/2 acres in MY OWN YARD,for the next 20 years. I'm looking at the Scag & the Exmark 61&quot; 23-25 HP machines. I like Scag's single 10 gal. gas tank, shaft drive, & large drive fluid capacity, but want to give Exmark's belts, Mobile 1 & twin 5 gal. tanks every chance before I decide.
Reply With Quote
  #6  
Old 06-26-2000, 10:31 PM
fdew fdew is offline
LawnSite Member
 
Join Date: Mar 2000
Location: Upstate NY
Posts: 147
OK. I have all these books so I looked it up. <br>Drive shaft efficiency goes down as the angle goes up. So a drive shaft coupling will be somewhere between 97 and 98% at the end of every drive shaft on a mower there needs to be a set of gears. Spur gear including bearings are 93-96% depending on the polish on the teeth. <p>Belts are about 96 to 98 %. But need no gears at the spindle. SO the answer is the belt from a vertical shaft engine to a mower spindle is probably a little more efficient. But it is close. Probably to close to call with out spending a couple of days with design drawings of the mower and a computer. I think the bottom line is complexity/ maintenance/ cost. If a mower could not be serviced I would want a drive shaft. (Automobile drive shafts don't fail often but when they do it is expensive to fix them.) Because a mower is easy to service and belts are not to expensive I would vote for a belt.<p>Frank
Reply With Quote
  #7  
Old 06-26-2000, 10:35 PM
Alan Alan is offline
Member
 
Join Date: Mar 2000
Location: NW Vermont (Milton)
Posts: 1,185
For what it's worth I had almost 500 hours on the first belt on the mule drive on my Exmark. Pretty reliable in my opinion.
Reply With Quote
  #8  
Old 06-26-2000, 11:09 PM
fdew fdew is offline
LawnSite Member
 
Join Date: Mar 2000
Location: Upstate NY
Posts: 147
With 3.5 acres either machine should last between 50 and 80 YEARS depending on mowing speed. But hay, I bought a 61 in Ferris (used) so I only get 30 to 50 years. Then I got hooked on this forum.<p>Frank
Reply With Quote
  #9  
Old 06-26-2000, 11:21 PM
Eric ELM Eric ELM is offline
Husband, Father, Friend, Angel
 
Join Date: Dec 1999
Location: Chicago, IL USA
Posts: 4,831
It's easy to do Frank, I've been hooked for a year now.<p>----------<br>&lt;a href=&quot;http://pages.prodigy.net/eric.erickson/&quot;&gt;Eric@ELM&lt;/a&gt;<br>The Grass is always Greener on the other side of my competitors fence
Reply With Quote
  #10  
Old 06-27-2000, 03:50 AM
Keith's Avatar
Keith Keith is offline
LawnSite Gold Member
 
Join Date: Dec 1999
Location: Central Florida
Posts: 3,777
My thoughts on Belt vs. shaft<p>I have a Grasshopper (shaftdrive) and a Kees ZTMax (almost an Exmark). If you look at them, you say &quot;that shaft drive sure is complex, it must be better&quot; You're half right, it is more complex, but I see no benefit. To me the Kees with it's mule drive transfers power better. With the shaft, you still have belts, you have just thrown a shaft and gearbox into the mix. When I first looked at the mule drive, I thought to myself, &quot;you must be kidding, that belt will slip and break too easily.&quot; It doesn't!<p>Now I really decided the belt was better recently. One day while going down a hill with the Grasshopper tractor and up a hill with the deck (like a V), the driveshaft slip yoke came apart and the driveshaft seperated. These two pieces seperated and flopped around out of control. I took it back to the shop and determined I needed to replace a couple of parts. First I needed to replace the PTO belts (about $30) and the two slip portions of the driveshaft (about $100) They were worn and had a lot of slop in them. While doing this you would have to replace a couple of U-joints ($40). When I pulled the QD off the powershaft I noticed it had play in it, probably the pillowblocks (they are about $60 for two). Yep, and it had managed to groove the powershaft (about $70) too. While attempting to take the pto pulley off the powershaft, I proceeded to break to pulley (about $45). Total damage: about $350 + tax if you fix it yourself. The gearbox would add another $150+ I would imagine. And that is not all, there are a couple more pieces that can go bad (the QD section of the shaft and deck yoke). You will also, most likely need access to a hydraulic press. Now what does this complex belt-shaft-gearbox system do? The exact same thing as one belt and a couple of idler pulleys on the Kees. <p>While other shaft drive decks may be less complex, it seems to be a waste, at best for this application. <p><br>&lt;font size=&quot;1&quot;&gt;Edited by: Keith<br><p><font size="1">Edited by: Keith
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 10:35 PM.

Page generated in 0.09911 seconds with 9 queries