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John Deere Tractors Discussion Forum
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Re: no oil pressure

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Josh cartey

11-27-2012 07:56:56

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Ok here is the full story. I have had the tractor for eight years. I have ran it those eight years many of times at parades and tractor shows. It had an old oil pressure gauge on it that didn't work. I assume it was getting oil and had oil pressure those eight years because its never had any problems. I bought new gauges for it back in July. When I got those installed I noticed the oil pressure gauge said nothing. I quit working on it till now. Yesterday I decided to change the oil and filter cause it had never been done. It had lots of sludge in the bottom of crankcase. I cleaned it out and refilled with oil and new filter. I started it up and after running for a minute it started knocking. Shut it down immediately. I know that changing the oil and filter should not make it stop getting oil but it must of been getting oil previously since in never knocked before. That's where I'm at now.

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11-28-2012 07:40:20

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 Re: no oil pressure in reply to Josh cartey, 11-27-2012 07:56:56  
Now how did you get sludge out????? And did you use john deere oil filter?????now if you didnt use john deerer oil filter get one, and take oil line off turn engine by hand until oil comes out line.something is just not adding up, also you should never run a tractor without oil gauge, aftermarket oil gauges never read correctly either always way lower than the real ones.

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11-27-2012 10:34:54

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 Re: no oil pressure in reply to Josh cartey, 11-27-2012 07:56:56  
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Ok then. Here's where you start, from above post:

First, DON'T RUN THE ENGINE UNTIL YOU GET IT TO OIL! Next, remove the cover over the crankshaft so that you can see that the oil pump drive coupler is intact and that the oil pump shaft turns when you rotate the engine. Next, verify with air pressure or some other engine, that the gauge you have does indicate correctly. Turn off the gas, ground the plug wires so you don't start a fire, and remove the plugs so you can spin it over pretty fast. If it the pump drive is turning, if it is filled with oil, if the filter canister is not cracked so as to allow oil to vent out of the top of the canister without getting to the lines, if the screen is not clogged beyond imagination, oil should pump even when turning over by hand/starter.
Now...did you have the pressure adjusting spring/reed apart? Make sure is it intact and correctly assembled, but don't run it anymore until you get it to oil. That's one of the simplest little regulated pump systems you can find. It can only go wrong in a few places.

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Josh cartey

11-28-2012 11:21:41

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 Re: no oil pressure in reply to F-I-T, 11-27-2012 10:34:54  
I have looked at it and it appears to be a broken coupler. Looks to be cracked looking through the crankcase cover. Bout to tear it apart to fix. Thanks for the help everyone! It's been quite a few years since I worked on one. Just needed a little refreshing.

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11-28-2012 11:35:51

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 Re: no oil pressure in reply to Josh cartey, 11-28-2012 11:21:41  
no problem to drop pump and put another coupler on but you might need a helper.cant be under tractor and on top at samwe time.

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11-28-2012 11:27:04

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 Re: no oil pressure in reply to Josh cartey, 11-28-2012 11:21:41  
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Josh, depending on the temperature, it could have broken because excessive water in the oil. Ice can break those couplers which act as sort of a "fuse" so that you don't do other damage. Check for water/ice in that pump when you drain it.

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