Exmark hydro pump leaky front seal.

Discussion in 'Mechanic and Repair' started by MikeM99, Jul 25, 2011.

  1. MikeM99

    MikeM99 LawnSite Member
    Posts: 3

    The front seal (the #20 shaft seal) on one of my Hydro-Gear pumps is leaking a little. I have some new seals on order but the more I read, the problem may be deeper than just the front seal. I have the old seal out and the shaft isn’t scored or worn where the seal makes contact. What is the chance that this 40mm OD x 17mm ID x 7mm thick seal is my problem? Do I need to install a whole new seal kit and rebuild the pump? Should I save myself a headache and order a new pump?

    Thanks for your time.
  2. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,246

    Is the seal cooked ? rubber real hard ?
    If it is ...replace all the seals.
    If not , check for endplay on the shaft, output bearing might be going bad.
  3. MikeM99

    MikeM99 LawnSite Member
    Posts: 3

    I should add that this is a 2005 Turf Tracer, TT3615KAC, with around 800-900 hours on it.

    Thanks for your response, Piston Slapper. The existing seal doesn't seem to the burned, the sealing surface is still pliable. I also checked and the shaft doesn't have any play in it.
  4. razor1

    razor1 LawnSite Bronze Member
    Posts: 1,985

    Do you use Exmark hydro fluid?
  5. MoGreen

    MoGreen LawnSite Member
    Posts: 88

    That has nothing to do with a hydro-pump....
  6. joesmower

    joesmower LawnSite Member
    Posts: 2

    It could also be your trust bearing #34 in the break down. Put a magnet in the hydro tank, if you pull out metal I would do a rebuild and flush the system.
  7. razor1

    razor1 LawnSite Bronze Member
    Posts: 1,985

    I never said it did.
  8. razor1

    razor1 LawnSite Bronze Member
    Posts: 1,985

    Mike, make sure your return hydro lines are working properly. I had one collapse internally causing the shaft seal to fail.

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