Case CC high engine oil pressure

Basil Greenleaf · Jan 26, 2013

Has any one had an experience with a Case CC high engine oil pressure? If so what can correct it? I cannot find a relief valve anywhere in the engine. My CC engine oil pressure is 125 PSI (checked several times) with different gauges. I"m afraid to drive it. I have removed the oil pump several times and it looks original. Two small gears. Thanks for any info you can provide. Basil

Christopher Mikesell · Jan 26, 2013

I had a problem with high oil pressure in my SC this past summer. The pressure relief valve was stuck closed and the oil pressure gauge pegged. It was a 60 psi gauge.
I checked my IT manual and it said that the pressure relief valve was contained within the oil pump casting on all C tractors. The illustration in the manual showed a large hex bolt on the side of the casting. This bolt held a spring and plunger within the pump body. However, the text said that there were two types of relief valves, the older one (before SN 4209666) was an adjustable ball type, and the newer one was the non-adjustable plunger type as shown in the illustration. Thus, the illustration might not match what you have. The proper oil pressure should be 30-35 psi.
I doubt that your oil pressure would get that high unless your pressure relief valve is stuck or blocked.

Basil Greenleaf · Jan 26, 2013

My CC has a plunger type oil PSI gauge on the block. It pops all the way out to show I have oil pressure. I have taken this pop out plunger apart several times. No relief valve on it. The pump consists of two small gears with no casting holes or other means of relief. And for the life of me I cannot find a oil pressure relief valve anywhere in the system. Thanks for the info. Basil

Anonymous-0 · Jan 26, 2013

that's the oil pressure indicator not the system relief, relief valve is located in the pump body and adjustable on all of the C series except the late ones and should be set for 30-35psi

Basil Greenleaf · Jan 26, 2013

I have dropped the engine oil pan and took the pump out several times and cannot find a relief valve anywhere on the pump body. When I remove the cover there are two small gears (aprox. 1" in diameter)in the body but nothing else. Thanks for your info. Basil

Christopher Mikesell · Jan 26, 2013

Personally, I would go looking for a different oil pump. It is always possible that someone adapted a pump from another engine that had the pressure relief valve located in a different place. It takes torque to make that much pressure, which is probably hard on the pump drive gear on your camshaft, as well as on the pump itself. The last thing that you need is for somthing to fail and the oil pressure to drop to zero while you are running the tractor. Also, make sure that your gauge is accurate, and is calibrated in psi, not kpa (125 kpa = 18.1 psi).

Christopher Mikesell · Jan 26, 2013

Sorry about the pressure comment, I just re-read your first post and noticed that you already checked with multiple gauges.

Anonymous-0 · Jan 27, 2013

it should be in the T shapped fitting screwed into the pump body which the oil line attaches to, if it's not there someone deleted it

Case CC high engine oil pressure

Basil Greenleaf

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Christopher Mikesell

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Basil Greenleaf

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Anonymous-0

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Basil Greenleaf

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Christopher Mikesell

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Christopher Mikesell

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Anonymous-0

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