help wiyh hydro pump please

swoods33

LawnSite Member
Location
louisville,ky
hope someone can help,I have been rebuilding a older exmark turf tracer and I have ran into a problem a wheel stopped turning.We found 2 stuck springs in the pump after freeing them and cleaning and a seal kit,proceeded to replace bearings in wheel motors.
ok now all was well for about a hour and noticed rt. wheel getting sluggish and slower to the point of at a low idle you can almost stop the wheel,not so much at a high idle. I have tried repeatedly to get any air out and now I have noticed more heat in the system than i care to feel.
Please help it's my only mower and i am just tring to get started with a small business.

I know most everyone says replace things but i can't afford the 600 for a new one and can't find anyone to rebuild or sale re mans,any other suggestions Thanks

sorry I knowmy grammer stinks
 

djagusch

LawnSite Platinum Member
Location
MN
Did you clean the lines and wheel motor out really well? If not the pump is probably gunked up. Doesn't take much.
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swoods33

swoods33

LawnSite Member
Location
louisville,ky
Did you clean the lines and wheel motor out really well? If not the pump is probably gunked up. Doesn't take much.
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I have flushed 4 quarts of oil through it and when it was apart cleaned both wheel motors and the one pump that had the stuck springs. I have also noticed that that the controls are very easy to squeeze,witch is nice buth the other side is normal feeling but a little more noisy. Makes no since to me. Could it be possible the springs in that cylinder block froze up again and creating a little cavition and the weak pressure like before. I only cleaned it up I did not replace it doing everything I can to spend as little as possible till I get more work and Mabey a new or at least a newer one and have this as a spare, but till then this is my only sorce of income. Thanks for any and all help
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djagusch

LawnSite Platinum Member
Location
MN
Most likely the springs are shot. The other thing is the piston to bore shouldn't be swapped between them.
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swoods33

swoods33

LawnSite Member
Location
louisville,ky
So each piston has its own home that it should go back in to.could this also be the creamy looking oil in the resivor or charge lines breaking down. If line are sucking closed couldn't this be part of the problem to. If so do they have to be replace with OEM or can I use other high pressure hose
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piston slapper

LawnSite Platinum Member
Location
Tampa Fl
If a line is sucking closed....that's bad
Did you replace the hydro filter?
Creamy oil is air in the system.
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swoods33

swoods33

LawnSite Member
Location
louisville,ky
I have replace filter twice and ran 4 qts. of oil through it trying to flush it. It's pulling strait just weak at the low idle. Someone told me its moisture. So that's why I have been flushing with new oil. I am just lost.
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swoods33

swoods33

LawnSite Member
Location
louisville,ky
New symptom - just noticed with machine turned off and in neutral the left wheel is real easy to turn not quite free wheel but not far from it. The rt one is hard to turn. Thought by pass screw was loose but it's not. Even swapped the screws and still the same. Wow what's next??
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djagusch

LawnSite Platinum Member
Location
MN
Does the wheel motor turn freely with the hoses disconnected? If so the problem is in the wheel motor. I would recommend not running it too much trying to figure out what is going on, its just moving crap/filings around which isn't good.
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piston slapper

LawnSite Platinum Member
Location
Tampa Fl
Is the left side pump the one that had the stuck pistons?
Sounds like they're stuck now, and pumping air into the left wheel motor.
Id look inside that pump again.
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