On Thu, 12 Jun 2014 08:42:50 -0700, wrote:

I have a mid 70s Case CK780 backhoe. The thing had seen lots of abuse
before I bought it and I have used it pretty hard since. The power of
the hydraulics has gotten weaker over the years. I used to be able to
kill the engine by trying to push or pull too hard. Now this doesn't
happen. So I'm thinking that the pump has a lot of wear. Over 30 years
ago I used to repair gear pumps in a lumbermill I worked in by
grinding the end plates of the pumps to remove scoring. But I don't
know how much more pressure the pumps put out after this repair, it
was just what I was told to do and I did it a lot. Considering the age
of the tractor I'm wondering if I might just be better off buying a
new pump and also if there is somwhere else I should look for the
lowered power of the hydraulics. The power loss has been gradual over
the years so I'm thinking it's probably the pump.
Thanks,
Eric


Any filters in this system? Like others have said check with a gauge
first, maybe see if the regulator is out of adjustment.

Disassemble pump and look first, then decide how to go. Unless you
depend on this machine for a livng, then get parts on hand first. Your
post hints at this is an ocassional use machine.

On my Ford 4000 tractor/back-hoe the power steering pump was shot, a
grand for a new one, still available though.... I put on a Buick
power steering pump off a FWD car. The inlet pointed the right way on
it. I worked way better than the worn out one. The end plates were
scored over 1/16" deep.

If you do service the pump put in all new fluid and clean the
reservoir out.

Remove 333 to reply.
Randy

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