Burned out pump?

YukonKing · Jan 12, 2009

Little Help?

Ok So, Jinma 254LE main tractor pump/gear type. So I started her up on boxing day and let the tractor warm up. However I put her on high idle fairly soon (cold oil). When I came to move the tractor 1/2 hour later there were no hydraulics nothing. The pump was hot to the touch, starved for oil? So I took it apart it all looks ok?

thoughts

john_bud · Jan 13, 2009

You have a classic case of water in the oil. Ice is blocking the flow of hydraulic fluid to the pump. You should mic the clearances to determine the wear. That 1/2 hour with no lubrication is like 1000 to 5000 hours of normal operation.

YukonKing · Jan 13, 2009

So opinions on pump condition based on pictures? Good/Bad usable?

Soundguy · Jan 13, 2009

Post the specs from the book, then the observed clearances.

Also.. find your blockage.. sometimes QD's get cocked apart and won't pass oil.. Jinma tractors have a bad habit of placing QD's in line with pumps... Kinda of a 'designed to fail' sort of situation... Like putting you in the center of a 3ac mine field with only one safe path out.. oh yeah.. and you are blindfolded!

soundguy

Farmerford · Jan 13, 2009

Can you separate the side plates from the gears and send pictures of the sides (ends) of the gears and the inside surface of the side plates? I suspect the most scoring occurred where the sides of the gears rub on the side plates. I also suspect the plain bearings in each side plate for the end of each shaft scored. If the side plates are stuck on the gear shafts, that is a pretty good sign that the bearings are scored. I am surprised that the pump did not seize and shear the key in the input shaft.