BH80-X Hydraulic Cylinder Leak By

[RocFire]

I'm new to tractors and Hydraulics but a long time mechanic and off roader.
My BH80-X with an independent Hydraulic Pump (PTO) has a really weak bucket cylinder both curl and uncurl. I bought and threw on a in line pressure tester. I get about 750 PSI. Then I fully extended the cylinder (curled), disconnected the line to the retract (uncurl) and starter the pto and used the curl and got a continuous flow out of the retract (uncurl) port on the cylinder.
This should mean I have fluid bypassing the seal inside right?
And that the cylinder needs to be rebuilt?
Anything else I should do before ordering the rebuild kit?
I have id'd the kit as 1024760 from Messicks as the cylinder ends in J.
Looking forward to playing with this but can't dig with a curl this weak.
Thanks.

 

[TheOldHokie]

I'm new to tractors and Hydraulics but a long time mechanic and off roader.
My BH80-X with an independent Hydraulic Pump (PTO) has a really weak bucket cylinder both curl and uncurl. I bought and threw on a in line pressure tester. I get about 750 PSI. Then I fully extended the cylinder (curled), disconnected the line to the retract (uncurl) and starter the pto and used the curl and got a continuous flow out of the retract (uncurl) port on the cylinder.
This should mean I have fluid bypassing the seal inside right?
And that the cylinder needs to be rebuilt?
Anything else I should do before ordering the rebuild kit?
I have id'd the kit as 1024760 from Messicks as the cylinder ends in J.
Looking forward to playing with this but can't dig with a curl this weak. Lop
Thanks.

Yes but it would be easier to understand your description if you stuck to just curl/dump or retract/extend Mixing in both had me doing mental gymnastics to follow your description

Here is a simple way to test a double acting cylinder

1. Fully retract the cylinder
2. Remove the hose from base end of cylinder and plug the port in the cylinder.
3. Set engine RPM to max/high speed, operate conttol valve to retract cylinder, and hold it there

If the cylinder extends the piston seals are leaking.

Dan

 

[RocFire]

I definitely found the leak by. There was no seal at all on he piston, just the O ring that belongs under the seal. I replaced the o ring and seal on the piston left the rest of the seals alone as I didn't have any leaks and it seems to be working great. No trace of the seal at all only thing I can come up with is that the PO took it apart to repair and then put it back together while waiting for part and never finished it. Pretty easy fix for my first hydraulic work.