JD Z925A 60" Demo unit----Way under powered!

Discussion in 'Lawn Mowing' started by ProStreetCamaro, Jun 11, 2011.

  1. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Posts: 4,103

    This thing cuts absolutely awesome! BUT it is WAYYYYYYY under powered! I mean way way under powered. It was struggling to come up this hill in my back yard.



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    That picture was cut with my Gravely 160Z with 25hp kohler and that hill barely phases my mower. This Z925A on the other hand wants to come to a stop mid way up the same hill and I was barely cutting anything off because I just cut it this past tuesday. If it was super deep like it was all spring Im not sure this Z925A would be able to cut it with out going at a snails pace.




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  2. weeze

    weeze LawnSite Fanatic
    Posts: 7,815

    if you wanna go with a 60" deck i would step up to the z930a at least...it has the 29hp kawi

    i have the z920a with 54" deck and it has 26hp...not underpowered at all on mine...i think with the 60" deck the 27hp on the z925a might be a little underpowered....a z925a with a 54" would be fine.
     
  3. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Posts: 510

    How many hours on demo? I agree you need at least a 930 or 950 for the 60" deck. It feels like the hydros on these really suck the power. It would be better to back the top speed off to 10 or 11 mph and have more torque. Lets hear some more of your thoughts compared to the Gravely.
     
  4. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 12,884

    I have a new Z720A with the 25 HP Kohler and 60" deck, and that hill would be nothing for it. I have one very similar in my back yard, and I have a nice thick yard like the one in the pic. It doesn't change sound or speed whatsoever, and cuts it like it's nothing.

    I am always suprised at the comments on here about mowers being underpowered, especially when someone asks if a 24 Kawi will be a big enough engine for a 52" deck.

    Good freakin greif! I may only be a part time LCO, but I have been doing it for a very long time, and cut lots of different properties with varying types of turf.

    I have yet to find one I can't cut cleanly and with beautiful stripes with my 21 year old John Deere garden tractor with a 46" deck and a 14 HP Kawi, let alone a dedicated ZTR mower.


    How many hours are on that Deere? Maybe it stil needs to get broken in a bit yet.
     
  5. SouthSide Cutter

    SouthSide Cutter LawnSite Bronze Member
    Posts: 1,333

    What you dont understand is how much power the pps take. I used to mow with a old Cub Cadet with a 10hp motor. But it was a gear trans. I going to demo a 930 Monday or Tuesday with a 60 Mod deck. I thought he said it had a 30 Kaw on it.
    I have two Scags both with 61 decks. One is a 25 Kohler TC and the other is a 29DFI Kaw 61 TT. I can kill the 25 and bog the 29 in some places.
     
  6. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 12,884

    No, I get it regarding the Hydros. Like I said, I have been doing this a long time, even if only part time, with a lot of different tractors before the ZTR's. I have owned a couple a of JD 445's with 22HP LC EFI engines, and 60" decks. They ate anything for breakfast- long, short, thick, or thin, and they'll go 8.5 MPH. My 4110 with a 21 hp diesel and 60" deck would do it even better, and my 4115 better still. My JD GX335 w/54" would too, so I just don't get it when guys are worried about being under powered. These are all hydros.
    BTW, I still use that 21 year old JD, and it runs the powered bagger just fine in all the thick leaves I have in the fall.
     
    Last edited: Jun 11, 2011
  7. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Posts: 4,103


    When I picked it up it had 16.7 hours. I agree it is the hydros that drain most of the power. I was kind of shocked with the way it bogged down to be honest. With my Gravely only having 25hp and being a beast I figured this 27hp would just plow through anything. Im not sure it makes sense to switch to JD and have to get a huge fuel sucking engine when other mowers can do the same with smaller more fuel efficient engines.

    To compare it to my gravely I will need a few days to get a feel for it. I have it all week so later this week I will compare them. So far I can say it cuts just as good and I LOVE the seat. It does seem to ride kind of firm and I attribute that to the flat free front tires. The sticks are very stiff and I am not sure I like that yet or not. I do like the easy height adjustment. Im not sure I like the idea of this machine being 1400 pounds compared to my 1000 pound gravely. I am 260 so this machine is only 340 pounds shy of 1 full ton which is crazy for a mower like this.
     
  8. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Posts: 4,103


    Ahhh ha! I just looked and the Z720A has 10cc pumps and wheel motors! That is what my Gravely has and that is why yours does not bog at all. THAT might be my next mower! I prefer the kohler over the kawi and I like the 10cc setup better to reduce power draw. HMMMMMM I might have to see if they have a 720A for me to demo next.
     
  9. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 12,884

    Check the position of the stick mounting bolts. They are 3 position adjustable on the 900 series, 2 on the 700's. Maybe you can make it a bit lighter to the touch.

    Also, the 700's have gear reduction in the hydros like the 900's and they do seem to have lots of torque. I like the fact that they are enclosed units too.
     
  10. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Posts: 4,103

    HUGE power draw difference between 13cc pumps and motors and 10cc pumps and motors. Honest to god the engine bogged down to at least half speed coming up that small hill in my own back yard. I just might take a video of it to show everybody some time this week before I return the mower.
     

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