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70 oil pump

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donwisc

11-14-2001 07:36:15




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My buddy ran his 70 LP accidently on low or no oil pressure. Its not seized but we will do the basics to find the cause such as checking the gage, relief valve spring and pump drive shaft.

Removing the pump looks like a nightmare going thru the top of the gearcase and unhooking lines. Hopefully we dont have to pull the pump but Im looking for any words of wisdom in case we do. Thanks in advance for any help. Don

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donwisc

11-14-2001 20:01:29




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 Re: 70 oil pump in reply to donwisc, 11-14-2001 07:36:15  
Thanks for all your comments, it was a nice day in Wis so we got into the problem. The gage tested ok with air pressure, the pump shaft and coupling and shaft key was ok. Cant tell for sure the pressure regulator is good because the oil was drained. Took off the case cover and by feel may be able to disconnect lines from pump as suggested but hope we dont have to. Checked the rod bearings and found excessive clearance which may have caused the drop in oil pressure.

We'll mike the crankshaft and see what size bearings will be needed and after we reinstall determine if we really have a problem with the pump or regulator.

Will update results Don

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Clooney

11-15-2001 03:44:01




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 Re: Re: 70 oil pump in reply to donwisc, 11-14-2001 20:01:29  
Donwisc, while you are in there check the oil filter head to top of filter can for sealing & gasket contact as it is a REAL COMMON problem on that type of oil filter to have the nut on the filter cover overtightened at one time & distort the filter can top, if the top of the filter can is distorted you will have almost no oil pressure with the oil hot. A good indicator is a filter cover stud that is crooked or not centered, but if the top is pulled straight down the stud could be straight & still have a distorted top. Another thing to look for is a double "O" ring in the filter cover groove in the crankcase, if you find 2 "O" rings the cover was probably overtightened to stop the resulting oil leak.

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Phil

11-14-2001 13:25:00




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 Re: 70 oil pump in reply to donwisc, 11-14-2001 07:36:15  
Believe it or not, removing the oil pump & re-installing it is not too big of a project. The oil lines that Deere supplied were all pre-formed such that there won't be any deflection that could make loosening the threads difficult. It is advisable to use a set of 'stubby' end wrenches or line wrenches, but with a little patience, it can be accomplished with regular-sized equipment. It will also be a great time to clear the screen of years worth of sludge & grit.

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Todd

11-14-2001 11:15:42




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 Re: 70 oil pump in reply to donwisc, 11-14-2001 07:36:15  
The older deeres have a shaft that is driven off the cam that goes down and drives the oil pump. At the top of the shaft is a square coupling that somtimes get loose or breaks. Check that. How long did it run without oil pressure? If not long you shouldn't have hurt anything. Also, take the plug out of the side of the crankcase by the belt pulley. That is where your oil pressure is adjusted. You may can screw it in and increase your pressure to specs.

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