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IH CUB LoBoy Series - 154, 184, 185 Forum -- Questions and answers to all of your LoBoy related issues.

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hydraulic control valve

Sun Feb 03, 2013 8:38 pm

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

Re: hydraulic control valve

Sun Feb 03, 2013 9:03 pm

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.

Re: hydraulic control valve

Mon Feb 04, 2013 7:33 pm

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

Re: hydraulic control valve

Wed Feb 06, 2013 4:33 am

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

Re: hydraulic control valve

Wed Feb 06, 2013 9:02 am

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.

Re: hydraulic control valve

Sun Feb 10, 2013 7:53 pm

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