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  • #1

    hydro max VI

    Well guys I bought a bunch of hydro stuff this summer with the intentions of building my own 6x6 with hydrostatic drive. Well that all fell short.Any how to get to my point and question. I have just recently purchased a 1988 maxVI and have leaned towards gutting the entire tub, axles, bearings, tranny, engine. I have thought about building a sub frame under the max and attaching it to the inner frame through the axle/bearing holes in the tub. With in the sub frame I would have 6 hydraulic wheel motors with 5 lug wheel hubs. I figured (3) 4x4 square tubes for the axles with wheel motor attached to each end. Then those axles attached to a 3x5 angled sub frame to which the max tub would sit into and bolt down using the factory axle holes and bearing bolt holes. I would inturn mount the engine down in the tub rearward (were the tranny was) and have the dual stacked hydro pump just under the rear seat with a flex drive shaft connecting them (just to help balance).

    Now a question for any of you hydraulic guru's! How would 6 motors be run off a pump, straight through in a chain gang or 1 large line going to a bank to divert 3 seperate lines to each motor?

    I have no need for speed this thing is strictly a slow and steady hunting vehicle. I am not very concerned about floation either.

    If I decide to go this route I have the t20, axles, well lets just say everything in side the max short of the frame is got to go. So there could be a nice sale coming up!
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  • #2
    I'm not trying to change your idea but I'm just wondering why the need for six individual motors. Why not mount the hydro motors inside the Max and only use two?

    If you do decide to build a subframe and use six of them, being outside of the body you could easily add suspension to each wheel and still have the tires sit close to the body. Just a thought. Regardless of what you decide to do keep us updated!

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    • #3
      No Chains........ And Sprockets. Yah Hoo......

      kwick%20kut%20pump.jpg kut%20motor.jpg 3k13md3p15Qf5Tf5R49b326956f3131fc19b5.jpg
      Last edited by Mike; 11-23-2009, 10:39 PM. Reason: tried fixing attachments but the motor pics are actually that small

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      • #4
        gotcha. What size motors did you purchase? The attachment messed up in your previous post.

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        • #5
          Three motors per side would be run in series. You would have to case drain the motors to the tank or cooler/ filter. The pressure drop would be calculated across the three motors. The motors would have to be good for the max press even though the torque per motor would be one third. You will be adding allot more weight than the original Max4.
          A better design would be to run the pump from a CVT belt from the engine and chain drive from 2 motors. This is how the Mudox is set up.
          The CVT design also allows the engine to start easier as the load is eliminated during cranking.
          Acta non verba

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          • #6
            I have to look up the specs on them, They came off a kut kwick slope mower that ran dual 22" ag tires on each side. It;s top speed I believe was 15mph. and it was a 3klbs machine with a 24 hp onan running it.

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            • #7
              Originally posted by jerseybigfoot View Post
              Three motors per side would be run in series. You would have to case drain the motors to the tank or cooler/ filter. The pressure drop would be calculated across the three motors. The motors would have to be good for the max press even though the torque per motor would be one third. You will be adding allot more weight than the original Max4.
              A better design would be to run the pump from a CVT belt from the engine and chain drive from 2 motors. This is how the Mudox is set up.
              The CVT design also allows the engine to start easier as the load is eliminated during cranking.
              I am trying to eliminate running belts,clutches,chains, sprockets, bearings, simplify sort of speak. The pump I have was enabled with a electric pto clutch. I dont think of it as weight , It's just beefy!
              Last edited by SKYHOOKDUTCH; 11-23-2009, 10:50 PM.

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              • #8
                Originally posted by SKYHOOKDUTCH View Post
                No Chains........ And Sprockets. Yah Hoo......

                [ATTACH]3880[/ATTACH] [ATTACH]3881[/ATTACH] [ATTACH]3882[/ATTACH]
                What displacement Pump and motors do you have? They look larger than required and would require a large volume pump. Have you worked the Numbers? Do your calculations first.
                Acta non verba

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                • #9
                  I have to run the numbers to get all the specs. I have the pump and 2 motors from a slope mower, It's called a Kut Kwick slope mower. I actually have the entire mower. It had a onan 24hp engine on it. The engine gave up and Washigton dc public works sold for scrap. So I bought it. The pump has the swash plates in it for foward and reverse control.
                  Last edited by SKYHOOKDUTCH; 11-23-2009, 11:02 PM.

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                  • #10
                    Originally posted by SKYHOOKDUTCH View Post
                    I have to run the numbers to get all the specs. I have the pump and 2 motors from a slope mower, It's called a Kut Kwick slope mower. I actually have the entire mower. It had a onan 24hp engine on it. The engine gave up and Washigton dc public works sold for scrap. So I bought it. The pump has the swash plates in it for foward and reverse control.
                    The performance will be similar to the tractor with the same size tire as long as you add the wheel motors in series. I assume the pump was a tandem unit with an internal charge pump and aux pump. Two swashplate controls, cooler, filter and reservoir.
                    Acta non verba

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                    • #11
                      Originally posted by jerseybigfoot View Post
                      What displacement Pump and motors do you have? They look larger than required and would require a large volume pump. Have you worked the Numbers? Do your calculations first.
                      Ok here are some numbers for the motors, they are a trw ross wheel motor tg series, max psi is 2500, displacement is 32.6, max torque is 10735, max flow is 30, rpm with no load is 7, max continious psi is 2000 and at 5gpm max continous rpm is 31.75

                      The pump I think is a series 40 sundstrand pump. I am going to carry it to work tomorrow and let the hydro guys look it up.
                      Last edited by SKYHOOKDUTCH; 11-23-2009, 11:21 PM.

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                      • #12
                        One other design that crossed my mind is a track set up. I would just have to run 2 wheel motors at the rear to turn the drive sprocket. I am invisioning a cushman trackster looking machine. Still would go with a sub frame set up I would like to gain about 8-10 more inches of clearenss. I would set the tracks out a bit wider than factor tire width. I got to go go call Sunbelt rentals to see if they have any rubber tracks laying around !

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                        • #13
                          Cool....Go for it.Something different.Don't destroy anything and if your not happy with it you can go back to stock.Either way your a winner.Best of luck

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                          • #14
                            Still looking for snowmobile tracks but I am moving towards making this happen. I have a guy with a john deere 440 I am going to look at tomorrow. I'll keep yah posted

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                            • #15
                              updates on my HYDROMAX

                              Updated pics, I revised my build and moved the drive axle to the front. I am now splicing 2 snowmobile tracks together per side.
                              Attached Files
                              Last edited by SKYHOOKDUTCH; 01-20-2010, 10:32 PM.

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