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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
Show Parts for Model:

Super 77 Hydraulics theory

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Rob Mo.

11-07-2012 15:18:07
99.1.128.150



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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.

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J. schwiebert

11-07-2012 18:02:29
209.143.33.150



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-07-2012 15:18:07  
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.

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Rob Mo.

11-08-2012 09:15:12
99.1.128.150



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 Re: Super 77 Hydraulics theory in reply to J. schwiebert, 11-07-2012 18:02:29  
Do you by chance have the seal & bearing numbers?



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J. Schwiebert

11-10-2012 04:26:10
209.143.33.150



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-08-2012 09:15:12  
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.



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Rob Mo.

11-13-2012 10:13:50
166.147.104.20



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 Re: Super 77 Hydraulics theory in reply to J. Schwiebert, 11-10-2012 04:26:10  
Am I reading this right: need 2-k5041 & 2- k5042? Where can I find the seal #k682?



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Rob Mo.

11-07-2012 17:56:09
99.1.128.150



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-07-2012 15:18:07  
Anyway to test the flow while it is still on the tractor? ANybody got seal & bearing numbers?



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AB

11-07-2012 17:37:07
96.29.79.35



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-07-2012 15:18:07  
Centerplate could be cracked.



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dboll

11-07-2012 17:02:35
209.23.168.21



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-07-2012 15:18:07  
most likely pump needs seals, bearings and the end plates machined



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S.D.L.

11-07-2012 16:37:11
12.189.32.54



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 Re: Super 77 Hydraulics theory in reply to Rob Mo., 11-07-2012 15:18:07  
The fluid is most likely coming out of the middle piece on the pump. It is a common occurance among these pumps like that.



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