the name of the pump ?

[hodinhtran]

Good day sir.

I got the problem with my PUMP. I don't know the name of manufacture or model code of the pump. But I am sure this is the piston axis pump, diameter of piston maybe 25 mm.the number of piston are 9. The inlet port is larger than outlet port. The rotation of pump is clockwise.

The swash plate is control by mean of hydarulic, but I don't know how exact it does. And the situation is:

At first, the pump done well

After, when the pressure is about 50 bar, oil has gone to tank by drain line.not go in the outlet line of the pump. So the pressure gradual decrease.

Please help me to tell the name, code of the pump.And what problem with my pump. Thanks you very much.
I see the orther pump, but they are the same kind. and i have some information:

- i see on the house of pump the word " MUUUFK 8J3887-2-" and " UNNROU"
This is some picture of pump :
CR4 - Thread: What is Name, Code of the Pump

Please tell me any information you know a bout this pump.

 

[wdchyd]

This pump comes from a CAT 225 Excavator.....proprietary to Caterpillar......call you local CAT dealer for info and parts avail......

If the pump is by-passing to the case drain, you need to rebuild the pump, your rotating group and valve plates are worn out......

This I mentioned on the "Hydraulicspneumatics.com" Forum......