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.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
