View Full Version : Exmark hydro pump leaky front seal.

07-25-2011, 10:08 AM
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 isnít 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.

piston slapper
07-25-2011, 12:13 PM
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.

07-25-2011, 01:52 PM
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.

09-05-2011, 10:06 PM
Do you use Exmark hydro fluid?

09-06-2011, 09:11 AM
That has nothing to do with a hydro-pump....

09-06-2011, 08:44 PM
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.

09-22-2011, 09:56 AM
That has nothing to do with a hydro-pump....

I never said it did.

09-22-2011, 10:03 AM
Mike, make sure your return hydro lines are working properly. I had one collapse internally causing the shaft seal to fail.