Front Hydraulic Pump 641/2000

Hi all. I just purchased a front hydraulic pump from a dismantled 2000 to use on my 1962 641. My pump could not be repaired. The pump will bolt up but there is an extra fitting on top of the pump the the 641 didn't have. What is this fitting for? Can I plug it without any issues? Thanks. Steve
a235045.jpg

a235047.jpg
 
Just taking and educated guess but that small line may well be a line for the pressure relief valve by pass so no I would not cap it off I would run it back into the supply line
 
I believe the port in question is a case drain. The case drain should be routed back to the hydraulic resevoir. Case drains provide a means of relieving internal pressure due to normal internal leakage of hydraulic pumps and motors. Plugging the case drain port would result in excessive internal pressure and could actually be catastrophic. Please research the pump you have and ensure that the port in question is actually a case drain.
 
Hi! After researching the pump, I found out that it is a Cross brand hydraulic motor not a pump and that small fitting IS a case drain. The local hydraulic shop says a motor can be used as a pump but not vise versa and that the case drain can safely be plugged on the motor but not so on a pump. He does want we to flip the pump (motor) 180? to let gravity assist in keeping the shaft gear in oil. Motor is bi- rotational so there shouldn't be a problem. Thought you would like to know. Thanks for your input. Steve
 
Old, I don't know if you read my reply but the pump is actually a motor, which can be used as a pump, but not vise/versa. Extra line is a case drain and can be safely plugged on a motor but not a pump, if I understood the man correctly. Thanks for your reply as usual. You are always helpful. Steve
 
Case drain I guess could also be as I said a relief valve set up. Yep many way many companies do things to make it harder to figure out LOL
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top