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HydroGear Tech advice BDP10A

Discussion in 'Mechanic and Repair' started by piston slapper, Mar 5, 2012.

  1. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    I've got a hydrogear bdp10A pump on a Dixie Chopper that is weak under load.
    I disassembled and inspected the parts, and found a warped valve plate.
    Not a very common failure. The pump has no vibration or noise and all other parts look OK.
    My question is : Did something cause this plate to warp? Factory defect?
    Did the aluminun head warp, allowing the plate to shift off flat?
    Cylinder block springs are good and piston are free and snug.
    All bearings are good, no signs of wear to the sides of bearing seats or shaft.

    Anyone else seen this.........

  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I would say defect/mis-assembled, Put a straight edge on the head before re-assembly..... :waving:
  3. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

    I almost never work on them but first thought is possible bad dampner allowing the rotor/piston block to slap back and forth against the plate?
    Posted via Mobile Device
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    These dixie choppers are in full race trim...no dampners...no safeties...etc....
    There is something not fitting squarely. Its hard to think that its a defect, as
    The pump already has a few years of service. I guess I really need to take a good look at the locator pins that hold the plate in place.
    Posted via Mobile Device
  5. ricky86

    ricky86 LawnSite Silver Member
    Messages: 2,074

    Iv'e never seen a valve plate in a 10cc pump. They are in 12cc and up. (I thought)
    They can and do lift off the end cap when they get beat. Hi pressure oil coming from the cylinder block and hi pressure returning from the wheel motor can bend them. As fixer said, they need dampeners. They are getting away from the plates in newer production.
  6. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    I was really hoping that someone that was familiar with the Bdp10A pumps would offer some insight to the problem.
    The tension of the piston springs should never allow the valve plate to budge.
    Some Dixie Choppers were made without dampner springs. The larger bypass hoses and high pressure hoses dampen the initial engagement of the pumps.
    The spring setup on the pumps is more of a deadband adjustment than a dampner.
    The newer pumps were designed without a serviceable valve plate so that they would wear out and be replaced intead of repaired.
    Posted via Mobile Device
  7. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,066

    I would take a close look at the check valves, ya might want to install shock valve kits. Peruse the Hydro-Gear site for details.
  8. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Just got the pump re installed...
    Plenty of power in reverse.... still soft in forward.....bypassing somewhere.
    Installed new valve plate.....check valves looked real good...seating areas had light grey circles similar to valve seats in heads.

    Could the wheel motor have directional problems?
    When I put the mower against a tree to check the power, the wheel almost stops and about a second later the wheel starts digging in.
    Only happens in forward position....reverse is solid...
  9. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Guess I"ll bring my flow gauge to work tomorrow....only way to know for sure...
    Thanx for the help.....
  10. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Messages: 314

    I have a 2009 dixie that does the same thing . The left side is real week on a slope and barely noticeable on a straight run , reverse is normal . It started about a year after I bought it from cutter power brand new . Wonder if it was some kind of defect . The pumps on mine are both connected to a (tarnsaxle ? ) I think .Keep us informed

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