JD 8640 oil pressure

lenco55 · Nov 20, 2021

I have a customer who just lost engine oil pressure & tach drive. First I thought it was pump, but when he said he lost his tach & I ckd the tach drive & it wasnt turning its got to be what drives them both. Ive never been in one of these. Any ideas? Thanks

caterpillar guy · Nov 20, 2021

Probably get more better information on the Deere board.

matthies · Nov 20, 2021

Teeth are gone from the camshaft and oil pump.

buickanddeere · Nov 20, 2021

free parts book on the JD web site . Both drive gears have to be replaced as a pair . Or you get to do this all over again soon .

wore out · Nov 20, 2021

To be more exact, oil pump gear is driven from a gear made as part of the camshaft.

Tach drive gear drives off of the opposite side of the oil pump gear.

When cam and oil pump gears wear and strip oil pump gear stops so the tach gear is no longer being turned.

lenco55 · Nov 20, 2021

(quoted from post at 20:00:31 11/20/21)

To be more exact, oil pump gear is driven from a gear made as part of the camshaft.

Tach drive gear drives off of the opposite side of the oil pump gear.

When cam and oil pump gears wear and strip oil pump gear stops so the tach gear is no longer being turned.

Thanks for the info guys

tim s · Nov 21, 2021

This is exactly what happened,,it's a wonder it didn't lock the engine up right then..

JD 8640 oil pressure

lenco55

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caterpillar guy

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matthies

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buickanddeere

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wore out

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lenco55

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tim s

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