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Your tractor has what we call "hiccups". The lift arms drop until they actuate the lift mechanism and the pressure raises the arms again. You have an internal leak (obviously) and this is what you have to find. Ask the dealer about known problems with your particular model. Ask the mechanic what hydraulic parts they replace most often. Ask the parts man what parts he sells most often to cure leaks similar to yours. Start with the adjustments. Make sure that all linkages are set properly and have no wear in the connections. Hopefuly this will take care of it. If not you are going to have to dig much deeper into your hydraulic system. Check the O-rings on the lift cylinder and make sure the bore and piston isn't scratched. Hone or polish as needed. Check the O-rings in and around the control valve. Replace all even if they don't look bad. While you are in there, check the the condition of the spool valve. Make sure it is not worn beyond specs as this will allow fluid to leak past and cause the cylinder to drop. Check the drop poppet valve and the pressure relief valve as they will start leaking after some time. Rule of thumb: Anything between the control valve and the cylinder can cause this problem. Check everything for possible leaks. Depending on how difficult things are to remove and reinstall, you may want to do a "shotgun" repair on it. REPLACE EVERY O-RING, SEAL, VALVE AND SEAT. Expensive yes, time consuming, no. You can have a tractor back in operation quicker by not trying to work each piece individualy, but replacing any and all parts that could contribute to the problem. When doing this for a customer, it is most often cheaper for them in the long run.
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