Posted by Aric Datesman on January 28, 2013 at 16:03:25 from (188.8.131.52):
Picked up a JI Case 310 TLB a couple weeks ago, and am close to having it sorted out well enough to start digging. Having a devil of a time with the power steering though, and could use some guidance. Kindly pardon any ignorance on my part, as I know little about tractors. I'm quite mechanically minded though, and have spent quite a lot of time wrenching on old British cars.
Anyway, the power steering is the type that has the G45056 cylinder along the front axle with an integrated spool valve, which is actuated by a link off the steering lever. This is fed from a G45055 pump mounted on the side with the intake/exhaust, with the G45054 remote reservoir. When the engine is running I'm getting a lot of foaming in the reservoir no matter how many times I purge the system, and seemingly a lot of fluid flow even with the spool valve on the cylinder centered. I'm also getting absolutely *no* power assist.
I've had the pump apart and it looks like it had been rebuilt sometime in the past, and clearance between the lobes of the ring and star-shaped piece in the pump (part A11024) looks to vary between 0.002" and 0.006". I haven't yet done a pressure test on it, so don't actually know if it builds any pressure. It will definitely move fluid though, and with the hose capped off it will stall the pump and the belt will slip (it's driven by double groove pulley on an alternator conversion).
I took the cylinder apart today to take a look at the spool valve, and have a new set of seals for it coming from Messick's on Wednesday.
At this point I'm kind of at a loss what to poke at, as I don't understand spool valves well enough to tell if that's the problem or the pump is. Any thoughts or advice?
Another thought I had is I think I saw mention in a thread here somewhere about the possibility of simply ditching the separate power steering pump and instead splicing it into the main hydraulics that run the loader and backhoe. I know for a fact that pump works, as both the loader and backhoe work just fine. Would cost a not small amount for fittings and new hoses, but compared to a pump rebuild for the separate pump it might be a better option.
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