Super 77 Hydraulics theory

[Rob Mo.]

Early in the summer I upgraded to a hydraulic setup. After everything was installed & tightened down I was eager to hook on to a tandem disc. After hooking to the hydraulic lift cylinder, it only moved stoked the cylinder 1" & stopped. I checked the fluid & it is nearly empty.

The fluid is dumping into the transmission somewhere, however I am not for certian. I am going to pull the unit out here in the next couple weeks & I am wanting some imput on what & where to look for. In theory, If I can get a power shaft, cut it down to where the splines that drive the pump & turn the shaft down to fit in a 1/2" drill. My thought is that if I can get the pump to turn fast enough to build up pressure, it should be able to spew out fluid where ever it is coming from.

Any thoughts or imput on how to test this system out of the tractor would be helpful.
 

[S.D.L.]

The fluid is most likely coming out of the middle piece on the pump. It is a common occurance among these pumps like that.
 

[dboll]

most likely pump needs seals, bearings and the end plates machined
 

[AB]

Centerplate could be cracked.
http://www.oliverhydraulicpump.com/

 

[Rob Mo.]

Anyway to test the flow while it is still on the tractor? ANybody got seal & bearing numbers?
 

[J. schwiebert]

There are four seals that seal the pump. In theory 2 (1 on each end) keep the gear oil out and the other 2 keep the hydraulic fluid in. When you install the new seals, install all 4 so that the lip of the seal is facing in toward the pump gears. This is a comon rpair. Also change the filter and if the pump end plaes are scored, disssemble the coplete unit and wash everything with good hot soapy water. The pump is designed backwards. There is from 20 to 25% more load on the idler gear than on the drive gear. So make sure to change those bearings as well and they can be a pain to change. If your cener plate is cracked the relief valve is set too high or water is getting in the unit and ice is causing the problem. We at one time probaly took care of 200 Olivers with that style pump and if we sold one centerplate a year we were doing good.
 

[Rob Mo.]

Do you by chance have the seal & bearing numbers?
 

[J. Schwiebert]

Are you talking original Oliver numbers? If so I still have them in my head: 4-K2053 oil seals, 2 KS 5041 bearings, 2 KS 5042 bearings, 1 K-682 gasket plus 2 O rings I don't remember the number to as it they were changed to a new number system and a filter.
 

[Rob Mo.]

Am I reading this right: need 2-k5041 & 2- k5042? Where can I find the seal #k682?