Posted by andyleonard on June 18, 2009 at 12:17:00 from (66.214.85.108):
I have a 300U with a loader and a car-style 3GPM 1400PSI Saginaw pump mounted in front that only runs the power steering. Everything is mechanically O.K., including the steering box and gears, power assist cylinder rings and rack, and front end steering parts, but there's something wrong in the control valve assembly-I think.
Yes, I know the loader is outside design specs and is very hard on parts and yes, I have spoken to the very kind Mr. Jackson about my problem and about his excellent $olution. He indicated my stock system should work reasonably well - as it has in the past - with the pump I have.
Yesterday the rebuilt pump tested at 1400 PSI on the bench at the rebuilder's. I brought it home, put the gauge in a T at the high pressure outlet with everything hooked up and got only 500PSI when steering either way and no real action at the wheels unless I lifted the front a little with the bucket, in which case you can spin the steering wheel with one finger from lock to lock and it feels great - full hydraulics - but no force.
I have had the assist cylinder apart and it seems fine - both rings and the bore are good. Not a lot to go wrong. The valve body in the steering wheel column has been cleaned and reassembled- per the parts book - but it seems there's something bypassing or leaking in there - to the tune of 900PSI.
My plan is to measure the output pressure from the valve body to the assist cylinder and if it's no good, to tear the valve body out again and put it back on the bench. But I don't have a clue what to do differently.
Does any one know where to look? My guess would be there's a bypass or overpressure valve in there somewhere and it's releasing too early, but I don't remember seeing one.
I have ordered the PS manual but this is making me crazy and I'm sure the manual won't show up for a week or so.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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