hydraulic control valve

[wagonmaster]

My hydraulics leak down on both of my 154's. Anyone had any luck rebuilding them ?

[Eugene]

I have rebuilt hydraulic control valves. You need to remove the valve, disassemble, inspect to determine bore, spool valve and o-ring condition. Problem is probably a damaged o-ring, but one never knows until the valve is inspected.

Just checked the service manual. Tractor serial number U018709 and below has a circuit relief valve. Might be the problem.

Service manual contains instructions for repairing the control valve.

[BigBill]

Are you sure there is no water in your hydraulic system?

[SONNY]

The mowers on mine go down after a week or so,but I think the lift cylinder has worn piston in them! thanks; sonny

[Eugene]

The hydraulic system is single action. If you are not losing oil externally, then the leak down is occurring at/in the hydraulic control valve.

[wagonmaster]

No water in the system. No external leaks. One tractor leaks down in about 5 min. the other tractor in 5 seconds.