Exmark hydro probs?

Discussion in 'Mechanic and Repair' started by lasher66, Aug 29, 2009.

  1. lasher66

    lasher66 LawnSite Senior Member
    Posts: 395

    HI,
    Alright, I blew a hyro pump while cutting the other day. It started making alot of clinging noise inside the pump then started shooting fluid out of the shaft seal where the pulley is mounted. I bought a new parker pump (which is the aftermarket replacement for hydro gear). Anyways put the pump on and changed the filter and fluid. Started mower up and everything worked fine with no leaks for about five minutes. Now the other pump decided to start shooting fluid out of the same spot as the old pump on other side through the shaft seal where the pulley is mounted. Is this just a coincidence. So I guess I will buy another pump and see what happens. Any ideas? Thanks

    Jason
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Sounds like you have my kind of luck.... :(


    Little advise, Clean/flush the hydro tank-all hoses and both wheel motors well. You don't want any metal shavings from the blown pumps entering the new ones.....


    Good Luck
     
  3. lasher66

    lasher66 LawnSite Senior Member
    Posts: 395

    Whats the best method to clean wheel motors,hoses,tank ect..
    Thanks

    Jason
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    It's a little time consuming and requires a few quarts of oil but is cheaper than replacing components.

    Compressed air is most helpful....

    Remove the tank and flush with mineral spirits then blow the inside dry.

    Remove both wheel motor hoses from the pumps, Hold the hoses over a drain pan and rotate the wheel hub. Wheel motors are in a sense pumps as well so what oil is in them most will be pushed out the hose. Then blow a continuous SMALL amount of air through one hose while slowly rotating the wheel hub until all excess oil is out of the motor.

    Now put a quart of oil in a clean container or cut a hole in the top large enough for the hose to fit inside, Rotate the wheel hub and the motor should pull the oil into it and push it out the other hose over the drain pan.

    Repeat the blow out while rotating procedure again, Once done swap hoses and repeat the pulling in of new oil procedure turning the wheel hub the opposite direction followed by the blow-out.

    Continue the process until you get clean non-contaminated oil through the motors, Once clean pull new oil into the motors (pre-fill) then everything can be re-connected and the system filled and purged of air.
     
  5. lasher66

    lasher66 LawnSite Senior Member
    Posts: 395

    thanks for the help
     
  6. Mrplowcjc

    Mrplowcjc LawnSite Member
    Posts: 81

    I also have a laser with hydro troubles. I replaced the left hydro pump over the winter on a spare machine. The machine has about 20 hours on the new pump this year and all of a sudden it is very hard to get any motion out of that wheel.. When you jack up the machine the wheel run fine. Any suggestions?
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Sure, Click HERE......
     
  8. lasher66

    lasher66 LawnSite Senior Member
    Posts: 395

    Does the oil have to be the 15w50 expensive stuff or can I use cheap oil to flush wheel motors out?

    Jason
     
  9. lasher66

    lasher66 LawnSite Senior Member
    Posts: 395

    Alright, last question hopefully. As stated in first post, after I replaced old pump with new one, thats when my other pump went bad. I am in the process of cleaning all components as you states before I put the second new pump in. Anyways, I did notice metal shavings in reservoir. Now I am wondering if this stuff contaminated my first new pump I put in and is there a way to flush it so it doesnt keep circulating? Thanks for your help again.

    Jason
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Sorry I missed your post #8, You really don't have to use the high dollar oil for flushing but use the same weight. But, For the final (pre-fill) use the same oil your going to run.


    You can flush the new pump in the same manor as the wheel motors (turning the drive pulley by hand). Just install the hoses back on the pump then remove the other end from the wheel motor.
     

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