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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oliver/Hart Parr 18-27 high oil pressure

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Doug Vose

05-10-2007 18:51:46




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I found an 18-27 (1934) in a field last year. It had been there for some time and was seized up. After some time and penetrant we got her turning over. We cleaned the mag and the carb (and failed once at rebuilding the floats) and put fresh oil and filter in it. It took a couple cranks and fired up. The guage showed 80 pounds of oil pressure. I have since pulled the relief apart to make sure it was clean and free and replaced the oil guage. It still has 80 pounds of presure, Is this OK or bad, and what can I do to fix it? Thanks in advance

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Ken L.

05-12-2007 16:29:34




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 Re: Oliver/Hart Parr 18-27 high oil pressure in reply to Doug Vose, 05-10-2007 18:51:46  
My 80 & 18-28 run at about 20lbs.



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RAB

05-11-2007 13:50:13




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 Re: Oliver/Hart Parr 18-27 high oil pressure in reply to Doug Vose, 05-10-2007 18:51:46  
Its bad. 1) You are more than doubling the load on the pump and drive etc. 2)You are driving far too much oil into the bearings and that may eventually erode the bearings - especially as the 80 has a bypass filter system. 3) Economy will suffer - just wasting energy. You can fix it by sorting out the pressure relief valve, setting it back to design by backing off the spring pressure or fitting the correct spring, most likely.
Regards, RAB

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red80

05-12-2007 13:06:26




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 Re: Oliver/Hart Parr 18-27 high oil pressure in reply to RAB, 05-11-2007 13:50:13  
what is the correct oil pressure for an 18-27 or 80.



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RAB

05-13-2007 15:21:12




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 Re: Oliver/Hart Parr 18-27 high oil pressure in reply to red80, 05-12-2007 13:06:26  
Hi red80, back home. Manual says recommended pressure is 25-30 psi for models 80,90 and 99. So 80 psi is nearly two times higher than it should be, or is that 3 times? Well once higher would be 5o-60..... .what the heck, who cares :). It should be 30. Now red 80? so you are a Cockshutt? Canada? where? I get to Ottawa occasionally.
Regards, RAB



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RAB

05-12-2007 14:39:30




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 Re: Oliver/Hart Parr 18-27 high oil pressure in reply to red80, 05-12-2007 13:06:26  
red80, I am away from home at the moment, but if memory serves me correct, the guage pegs at 40psi. So am guessing the reading should be good at 30 psi allowing some accuracy when pressure is low at tick over and hot. It should not exceed full scale deflection at any time. I would think that 20psi (engine hot) is more than enough for safe operation.
Regards, RAB



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