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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 350 diesel fuel in crankcase oil

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02-26-2007 13:12:36

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I have a 1974 JD 350 crawler with diesel fuel leaking into the crankcase oil. I changed the fuel tranfer pump, and it's still leaking. Can the Roosa master C injector pump leak? If so can the seals be replaced?
Thanks,
Charlie

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jdemaris

02-27-2007 05:40:40

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Re: JD 350 diesel fuel in crankcase oil in reply to CR, 02-26-2007 13:12:36

It takes a one piece seal - and it differs bewtween the CDC and the CBC pumps. If you cannot find the new seals, I probably have a few new ones laying around.

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vapet

02-26-2007 17:14:01

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Re: JD 350 diesel fuel in crankcase oil in reply to CR, 02-26-2007 13:12:36

Also when changing the seals, be sure and check condition of bushing in injector pump were seals ride. If bushing is worn, pump must be took apart to replace bushing.

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NC Wayne

02-26-2007 17:05:12

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Re: JD 350 diesel fuel in crankcase oil in reply to CR, 02-26-2007 13:12:36

If I'm not mistaking on that pump is one of the ones with the "umbrella" seals on the shaft. If so they are notorious to leak and can be a royal pain to change. If they are bad you might want to get someone that knows what their doing to change them or it's real easy to make the problem even worse of the new seals get rolled or otherwise don't go in right. Good luck.

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jdemaris

02-27-2007 05:38:06

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Re. One piece seal - not umbrella in reply to NC Wayne, 02-26-2007 17:05:12

No - there are no umbrellas seals on the C pumps. You're thinking about the DB and JDB series - which are totally different.

The pump will be either a CDC or a CBC. Both take one-piece lip-type seals that press in the front.

C series on early 350s can be CDC331-3DG, CDC331-4DG, CDC331-6DG, CBC331-1AL, CBC331-6AL, or CBC331-16AL.

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NC wayne

02-27-2007 17:37:05

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Re: Re. One piece seal - not umbrella in reply to jdemaris, 02-27-2007 05:38:06

Thanks for setting me straight. I see so many different kinds and brands of equipment on a regular basis they all tend to run together sometimes.

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