300U Hydraulics Mystery - HELP!

Posted by Bob Kirk on August 07, 2002 at 14:55:00 from (170.215.145.26):

I have an IH 300 utility with power steering, Fast-Hitch and a dual hydraulic loader — and some hydraulic problems to go along with all this. I've only had this tractor about a year. Here are the symptoms:

1. From the beginning, the hydraulic pump would make a metal-on-metal type "buzzing" sound ever 5 or 10 seconds when the tractor was running -- kind of a "bees nest" sound that lasts only a second or so. Seemed to vary depending on whether the nose was pointed up or down hill. I thought it might be indicating low oil level since the loader cylinders leaked pretty good, so I just made sure to keep the hydraulic fluid topped off.

All systems, including the loader, worked OK for most of the first year — until just after the only day when I used the loader and back blade hard moving fill for a new building.

2. Shortly after that, every once in a while the loader would not go up. Sometimes it would, but sometimes nothing. This was intermittent until one day when it stopped moving at all. During all this there was no change in the hydraulic pump noise.

3. At about the same time the loader quit, I noticed that hydraulic fluid was leaking quite heavily out of the top of the "Safety and Flow Control Regulator Valve" mounted between the reservoir and the 3- point control valve. The oil is coming out where there is a snap ring holding in the flow control valve. When the tractor is running, oil flows out. When the tractor is shut off, it sounds like air spits out of the same place.

4. This is the current status. Power steering is working and so is the 3-point, which has no problem holding up a heavily loaded trailer tongue. But no lift at all from the loader, even with the bucket off. "Rythmic" hydraulic pump noise is the same.

For a long time, I thought this was the hydraulic pump giving up. But then I realized that the PS and hitch would probably not be working if that was the case. Made me think that maybe the pump is "starving" for oil because of crud in the system, and that maybe I should take the reservoir and valves apart and clean them out.

Do you have any thoughts on this? Is there any trick to disassembly/reassembly of the reservoir and valves (assuming I can get "O"-rings and gaskets from the dealer)? Should I take everything apart, or do these symptoms point to one particular thing? (I have a good Case/IH parts manual with "exploded" diagrams of the valves.)

Many, many thanks for your help.

Bob Kirk

Follow Ups:

• Re: 300U Hydraulics Mystery - HELP! Ernie Bob 22:46:05 08/07/02 (0)
• Re: 300U Hydraulics Mystery - HELP! dick 21:16:03 08/07/02 (0)
• Re: 300U Hydraulics Mystery - HELP! joe 16:55:17 08/07/02 (2)
  • Re: Re: 300U Hydraulics Mystery - HELP! Kilian 20:07:19 08/07/02 (1)
    • Re: Re: Re: 300U Hydraulics Mystery - HELP! big fred 20:24:37 08/07/02 (0)

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