Hydro Gear Pump problems after servicing

Discussion in 'Mechanic and Repair' started by SKresse, Mar 28, 2010.

  1. SKresse

    SKresse LawnSite Member
    Posts: 10

    I have a Hydro Gear BDP-10L-117P on a Lesco walk behind mower. It was leaking fluid at the trunnion seal so I decided I would replace the seal. I got a seal kit and took it apart and replaced all the seals in the pump. Put it all back together and now the wheel will not turn. I tried to bleed the system many times by opening the release valve and moving the controls back and forth. When I look in the fluid tank the fluid going back in looks foamy and has bubbles. So I assume air is getting into the system somewhere. Where exactly can air get in? There is one suction hose going to the pump in between the two hoses going to the motor. How do I check to find where air is getting in? Any advise would be great cause i dont want to spent $500 on a new pump.
     
  2. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    Close the release or dump valve while bleeding the system. You are correct that the middle fitting is the suction line make sure that it(or any of the fittings) is not loose. Especially where it mounts to the pump. I would usually remove one of the larger fittings to get a wrench on it since really no space.
     
  3. SKresse

    SKresse LawnSite Member
    Posts: 10

    I tightened the suction line really tight and I cleaned the fitting out. Is it possible for air to enter between the top mounting plate and the lower housing of the pump? There is a gasket there that I replaced. This is driving my crazy, i checked all the fittings and cleaned everything and it still doesnt work.
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Try as MM stated above, And do it with the wheels blocked up off the ground if you haven't done that.
     
  5. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    Any chance you put the top charge pump on incorrectly? Its the small oval housing ontop of the head and if installed wrong your pump will not work.
     
  6. SKresse

    SKresse LawnSite Member
    Posts: 10

    I have the mower up on blocks, I opened the release valve and moved the controls back and forth about 5 times. Then I closed the release valve and the wheel turns very slow for a few seconds then it comes to a stop. I have tried that numerous times with the same result. And as I pull the controls to move the wheel forward i see foam appearing in the fluid tank.
     
  7. SKresse

    SKresse LawnSite Member
    Posts: 10

    I dont know if I put it on correct or not. Are you talking about the block that is held on with two allen screws. It is oval and I remember looking at it when I put it on and it looked the same if i turned it one way or the other. Is there a difference on wich way it is turned?
     
  8. ricky86

    ricky86 LawnSite Bronze Member
    Posts: 1,723

    Yes, a huge difference. The hsg is actually eccentric. Also, did the put the charge pump relief spring and ball in the correct place and in the correct orientation? The ball goes in the pump, and the spring goes in the hsg. The correct gasket or o-ring for the cover is critical also. If you didn't pre-fill the pump, you could have created a dry start situation, possible internal damage and it will take forever to bleed (if at all)
     
  9. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    If the wheels barely spin when hydros engaged, spin the wheel by hand while lever is engaged.You may be able to manually remove the airlock. Let go of the wheel when it takes off. Hope you didnt have any pieces left over after assembly.
     
  10. SKresse

    SKresse LawnSite Member
    Posts: 10

    I did put the ball and spring in the way you stated. And I did replace the gasket for the cover with a brand new one. I DID NOT pre fill the pump when I initially put it back together. I took the cover back off a second time and it is now filled with oil. Do you think I damaged the pump by not pre-filling it?
     

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