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JD 420 oil pressure problems

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Wayne Kachmar

08-25-2002 17:39:36




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I changed the oil on a 420C crawler I purchased and noticed that the old oil was a little thick and dirty. I put in new oil and filter. Now I can not get any oil pressure. The gauge works and dark oil comes out the oil gauge port. But at nearly no pressure. The manual states that I need to look in a series forty manuel to find info out on the oiul lubrication system. Any ideas or help appreciated. (presently and before the oil change the engine starts on the first turn and shows no signs of oil starvation)

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Wayne Kachmar

08-26-2002 18:52:33




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 Re: JD 420 oil pressure problems in reply to Wayne Kachmar, 08-25-2002 17:39:36  
I have checked and the lower washer (plate) is missing. However with the filter removed and the engine running only a small amount of oil comes up the oil feed port at the filter base. Is it possible that the pump in the oil pan is showing significant wear or could the pump plate have come loose?



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Clooney

08-27-2002 15:25:51




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 Re: Re: JD 420 oil pressure problems in reply to Wayne Kachmar, 08-26-2002 18:52:33  
Wayne, you could have pump wear & or a pump problem but more than likely you either have bearing wear or the pump inlet screen is plugged with crud.....



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Henry J

08-26-2002 05:15:00




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 Re: JD 420 oil pressure problems in reply to Wayne Kachmar, 08-25-2002 17:39:36  
Wayne

I have been known to use 10W40 in my 420 W, whether that be good, bad, or indifferent. Anyway, I thought I would let you know that the oil pressure stays in the high side of the green when cold and low side of the green when at normal running temp.



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Clooney

08-25-2002 18:14:26




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 Re: JD 420 oil pressure problems in reply to Wayne Kachmar, 08-25-2002 17:39:36  
Wayne, if your oil pressure problem started after an oil change it might be oil viscosity related. What weight oil did you use? Do you have the M88T washer under the oil filter? It is easy to loose as it sticks to the bottom of the old oil filter & gets thrown out with the old filter [some of the later 420's have that washer staked in so it won't get lost].
~I have an oil system diagram in my 40 manual but don't have the manual here where I'm at now. If you don't get one, or the problem figured out, E-Mail me in a day or so & I will scan the oil diagram & send it to you.
~I posted a short rundown on the M-88T oil filter washer & it's effect on oil pressure a few days ago on another site so see link to read that, the 40 & 420 use the same type of oil filter....

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Wayne Kachmar

08-25-2002 19:18:17




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 Re: Re: JD 420 oil pressure problems in reply to Clooney, 08-25-2002 18:14:26  
Thanks I will follow up on the m88t washer. I don't believe that a washer was at the bottom of the filter. However the 420c is a late model with five rollers and a straight upper support. Therefore I will need to check if the washer is staked down as you indicated. The oilsl is a normal 10W - 40W automotive oil (Penzoil). If that's not the problem I will take you up on the offer and e-mail more particulars.

Wayne

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Wayne in Tn.

08-26-2002 08:14:12




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 Re: Re: Re: JD 420 oil pressure problems in reply to Wayne Kachmar, 08-25-2002 19:18:17  
Wayne, I had that problem once on a 430. You mentioned the old oil was dirty, If the sealing washer don't fix it...remove the 3 bolts that hold the filter base to the block. Then use a wire and compressed air to clean out the return holes in the block. If these are plugged, your gage will not show any pressure. Wayne in Tn.



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