Posted by Tod Michigan on June 26, 2011 at 20:51:08 from (174.252.229.9):
I have a 460 diesel that all was working fine and suddenly lost power steering(PS) and hydraulic lift on the tele-depth system. I replaced my hydraulic pump(HP) last year and everything was working fine before just fading and quitting altogether. Since the HP issue, with the help of Pete23 on this forum, I Have since fixed the HP problem. It was a missing o-ring in the check valve system. So, now I've moved on to determine what the problem is with the PS system as it failed around/at the same time. As I mentioned, I had replaced the HP last year and before I removed the HP, I performed a pressure test on the power steering pump/system by placing a valve on the return line and a gage in the test port to see the pressure produced by closing the valve. When I was closing the valve I remember feeling the flow of the fluid as the pressure went up and felt like if I closed the valve completely that something was going to blow. The pump then produced around 1000psi before I opened the valve back up. I never closed the valve completely. Now today, I did that same pressure test and did not get the same result. The pump only produced 100psi and I never felt that rush of flow under the valve. My primary question is should I check anything further before I drain the fluid and inspect the pump? And then, what should I look for or inspect on the PS pump itself once I Have it out? This PS pump has run flawlessly since the day I got the Tractor. It has also run well since I replaced the hydraulic pump up until now and I never heard a strange sound or felt anything strange while using the tractor. If anyone has any further questions please let me know. I am somewhat lost. I'm hoping that tomorrow I can see something obvious once I get the pump out. I do plan to do a flow test before I take The pump out but I don't expect to Have much flow. PLEASE HELP. Thanks, Tod.
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