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JD 420c Oil pressure

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Wayne Kachmar

08-25-2002 17:20:28

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I purchased a 420C that I just finished a final drive and track system rebuild on. Along with that work I changed all fluids including the engine oil and filter. Old oil looked a little thick, I presumed that the previous owner didn't change it regularly. However when I now start the engine (which turns over immediately) I can get no oil pressure I checked the gauge it works and I noticed that oil will pour out the pressure gauge port but at nearly no pressure. Since it is dark and looks like the used oil that I replaced, I am concerned that the crankcase oil still looks new and does not seem to be picked up by the pump. Is there any pressure regulation devices outside the oil pump itself anddoes anyone know the correct trouble shooting procedure for this.
I'm concerned whether the problem is the oil system or the engine itself. (presently I have run the engine for over thirty minutes with no significant effect visible) Any help is appreciated.

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Bur Oak

12-22-2003 17:14:11

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Re: JD 420c Oil pressure in reply to Wayne Kachmar, 08-25-2002 17:20:28

Drop the oil pan and clean the pump screen, probably has an inch of sludge that doesn't like moving.

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possum

08-27-2002 15:39:38

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Re: JD 420c Oil pressure in reply to Wayne Kachmar, 08-25-2002 17:20:28

If the oil was that thick, your screen is probably plugged and sucked into the pump. Try flushing with kerosene (check the operator's manual) and you may rescue it.

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Rob J

08-26-2002 12:20:50

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Re: JD 420c Oil pressure in reply to Wayne Kachmar, 08-25-2002 17:20:28

You can remove the oil filter (assuming a spin on type, or just open up the container) and crank the engine over. You may have to start it (just for a few seconds) to get oil pumping through the galley. This oil should be fresh oil. Generally the first stop for the oil after the pump is the oil filter. Some old oil could have clogged the new filter so you might try changing the oil filter. You can also run the engine a short while with the oil pressure gauge removed. Your looking for a good stream of oil. Again...don;t run the engine all day with an open galley.

The only kicker you threw in is that you've run the engine for 30 minutes. This should have been long enough to heat up the old and new oil and loosen up things and get the oil flowing.

To answer you other question, most oil pumps have a bypass valve built into them. Usually pretty high pressure. You may want to drop the pan to have a look. Could be full of crud.

Good Luck,
Rob

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TonyK

09-04-2002 18:25:30

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Re: Re: JD 420c Oil pressure in reply to Rob J, 08-26-2002 12:20:50

Hi Rob,

Don't fool around with little or no oil presure.

The galley could be plugged. Remove the oil pressure plug and blow compressed air through it. Check the bottom of the filter housing. You will see a plug, remove it. If no oil comes out heavy carbon and dirt is pluging something. That plug is what you remove when you change the oil filter. Also is the large washer that goes under the filter there? Next bit of information, the filter only cleans the over pressure not all of the flow. If you remove the distributer, make up an adapter (flaten rod) and turn the pump with a drill. At least you will be driving the pump without destroying the bearings in your engine.

Any other questions just email me.

TonyK

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