2000/3000 hydraulic pump, new style / old style

rmissildine · Oct 8, 2017

I am wondering, can a 1969 - 1975 hydraulic pump be used on a 1965 - 1969? The difference is the hydraulic lines, 1965 - 1969 being the 3 bolt flange, and 1969 - 1975 being the compression nut style.
Can the lines be modified at the pump to work with the compression nut style pump, or will all the lines and the sump plate have to changed?
Anyone ever do this type of refit?

Thanks,
Roger

Ultradog MN · Oct 8, 2017

First of all what is wrong with your pump?
They are not difficult to rebuild and and
parts are available here at YT for a
reasonable price.
Rebuilding the pump you have would be my
first choice as it's easier (though not
cheaper) than swapping lines.
But to answer your question, yes the pumps
can be swapped. I did it once but opposite
of you. I used an early pump on a later
tractor. I went to a hydraulic shop and
bought about a 3" piece of rubber suction
hose to connect the suction lines
together. I used 2 hose clamps on each
side of the hose. I also bought a
hydraulic compression coupling to connect
the pressure lines together. I made both
connections under the foot board so they
were not noticeable.
I think the old style pump and lines with
3 bolts on each end was a better system.
The new style with compression fitting is
prone to failure.
Whenever I have to open one of those 3
bolt line setups I always buy new orings
from CNH dealer. The oem orings are
square cut and not regular round ones.
I have better luck with them.

rmissildine · Oct 9, 2017

Thanks for your reply Ultradog.
What's wrong with my pump? Well it appears there is a crack running around the pump body that someone repaired from the outside at one point. Didn't notice that until I pulled the pump off for the third or fourth time. Since it is in the suction cavity, I have attempted a repair. Using a tungsten/carbide cutter in my dremel, I ground around the crack and patched it up using JB Weld. Again, since it is not under pressure, that may perhaps hold. I didn't see any type of leak around the old repair, but since it is the suction side, unless the tractor is shut down, there wouldn't be a leak, just suck air.
I have a new rebuild kit for the pump, as well as a new pump shaft and bearing, which I bought before I noticed the crack, and a new pump body costs more than what I can get the new style pump for.
Can't find a good used pump body, hence my question about the modification. I agree with you that the bolt on flange probably seals better than the push-in style.
Any thoughts as to my attempted repair? I still have the pump apart waiting for the JB Weld to completely cure.

Thanks again,
Roger

2000/3000 hydraulic pump, new style / old style

rmissildine

Member

Ultradog MN

Well-known Member

rmissildine

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