On Thu, 12 Jun 2014 14:49:13 -0500, Ignoramus32163
wrote:

Lower power output of pumps does happen due to wear. Pay to have it
rebuilt.
If oil is leaking past the gears then the pressure should drop, right?
Danfoss, who make hydraulic gear pumps agree with me. They say if the
pump pressure plates wear the pressure output will bw lower. And lower
pressure is the problem I am having.
Eric
i

On 2014-06-12, 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