Hydro pump leaks on exmark

Discussion in 'Mechanic and Repair' started by siets, Jun 17, 2012.

  1. siets

    siets LawnSite Member
    Posts: 3

    I recently bought a 60 inch exmark that needed work. One thing that needed to be fixed was the right side hydro pump, because it was missing. (Previous owner used this mower as a parts vehicle) i purchased a brand new one and installed it, it worked perect for about 10 hours and all of a sudden i lost all hydraulic pressure. After looking I found my entire pulley compartment full of fluid. And i found that it was all coming from around the shaft. Being the pump was under warranty the local dealer replaced it out for a new one. However after installing the second new one it did the same thing with less than an hour on it. Anyone have an idea where i can start? It seems that it happens when the mower is running but not moving.
     
  2. Kelly's Landscaping

    Kelly's Landscaping LawnSite Platinum Member
    Posts: 4,262

    I doubt hes going to cover the second pump for you. Something took out 2 pumps in a few hours assuming you serviced the hydraulic fluid and flushed out the hoses changed the filter and made sure that was all good that leaves one thing. You likely got a bad wheel motor and they cost more then the pumps. The wheel motors when they break up send metal up the hoses and bye bye pump.
     
  3. orangemower

    orangemower LawnSite Silver Member
    from pa
    Posts: 2,773

    Let me get this straight. You bought a junkyard mower and expect it to work by just putting a pump on it?
     
  4. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    This may have been why it didn't have the wheel motor to begin with. Remember:

    [​IMG]
     
  5. Kelly's Landscaping

    Kelly's Landscaping LawnSite Platinum Member
    Posts: 4,262

    And when House is proven wrong and the person didn't lie he gets really pissed and becomes even more obnoxious.
     
  6. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Something doesn't add here...
    For the pto seal to fail...
    It is either external damage...something wrapped around or contacting the shaft..
    Shaft seal overheating from bad bearing...or years of use...
    Or..an improperly installed seal..
    Was there any metal in the hydro tank...
    It is possible that 2 defective pumps could come from the same vendor..
    They are still assembled by people...however if that's the case...they probably have more than 2 pumps being returned...
    Posted via Mobile Device
     
  7. siets

    siets LawnSite Member
    Posts: 3

    I have changed all fluids and checked the hoses, the wheel motor is working fine with no metal shavings at all in the lines or anywhere else.
     
  8. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    With no shavings present...its plausible that the seal is defective..
    There should never be enough pressure in the fluid inside the pump to blow out the seal...all the pressure should be isolated between the pump rotor and the head..
    Only a teardown by a trained technician...will show the reason of the failure..
    Do not take it apart if you expect to exchange it for a new one...
    Posted via Mobile Device
     
  9. BigFish

    BigFish LawnSite Silver Member
    Posts: 2,919

    Did you check the pump to tank return line/s for an obstruction/partial ?
    Hey, them hoses are cheap, I'd replace em.
     
  10. siets

    siets LawnSite Member
    Posts: 3

    That is one hose i have not checked. Could that cause enough back pressure to be giving me problems. I will check it out and let you know. Thanks
     

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