350B Hydraulic oil in crankcase

jdbart · Post by **jdbart** » Mon May 19, 2014 9:40 am

My 350B loader blew oil out the engine breather. I stopped and checked the dipstick which indicated way overfull. The main hydraulic reservoir was very low so I suspect that hyd fluid is somehow getting into the engine. I rebuilt the steering pump (which I now think is only connected to the reverser) and still have the problem. Does anyone have an idea on what is wrong and how to fix it?

Thanks, jim

Tigerhaze · Post by **Tigerhaze** » Mon May 19, 2014 11:00 am

Are you sure what you saw in the crankcase is hydraulic oil? I would suspect it is actually diesel fuel that has leaked past the seals on the injection pump, and the fact that the hydraulic reservoir is low is just a coincidence.

jdbart · Post by **jdbart** » Mon May 19, 2014 11:32 am

Tigerhaze wrote:Are you sure what you saw in the crankcase is hydraulic oil? I would suspect it is actually diesel fuel that has leaked past the seals on the injection pump, and the fact that the hydraulic reservoir is low is just a coincidence.

Thanks for the reply, I'm not positive and have considered that possibility. My hydraulic system is very tight and I never have to add fluid (I have owned the machine for 30 years). We did put a new (rebuilt) injection pump on it a few operating hours before this problem surfaced and I would hope that that rebuild and installation was proper. I just can't figure out any way that hydraulic oil could get into the engine. Are there any pathways you can think of?

Thanks again,

jim

DrLoch · Post by **DrLoch** » Mon May 19, 2014 12:41 pm

Is that a Roosa Injector pump?

jdbart · Post by **jdbart** » Mon May 19, 2014 2:23 pm

DrLoch wrote:Is that a Roosa Injector pump?

No, its a Standyne model JDB 2797

Stan Disbrow · Post by **Stan Disbrow** » Mon May 19, 2014 2:40 pm

Hi,

Well, the 350 hydraulic pump is in front of the crankshaft. So, it is a separate system, unlike the older machines. I don't see how that oil would get into the engine.

Stan

jtrichard · Post by **jtrichard** » Mon May 19, 2014 2:42 pm

A Stanadyne is a roosa master and the shaft seals are very easy to screw up and will leak fuel in the crankcase a re builder did that on mine once

jdbart · Post by **jdbart** » Mon May 19, 2014 2:48 pm

Thanks to all......I guess it has to be diesel fuel and I'll start on that repair, hopefully it is just the seals.

This was my 1st experience on this message board and I must say that I'm impressed...its great to have access to such a broad and friendly knowledge base.

DrLoch · Post by **DrLoch** » Mon May 19, 2014 2:51 pm

jtrichard wrote:A Stanadyne is a roosa master

Sorry don't know that much about the 350 series. I do know a little about the injector pump having rebuilt a number of them now. If the seal on the shaft got ripped when the injector pump was being installed that would solve the engine oil overfull issue. I'm making a couple of assumptions here... Did you change the shaft seals before installing the rebuilt pump? Did you use or make the little tool the compresses the umbrella seals on the shaft when you were installing the pump?

Tigerhaze · Post by **Tigerhaze** » Mon May 19, 2014 2:52 pm

The JDB pumps have umbrella seals on the shaft they are very easy to damage when installing them. if you didn't use the proper tools or method to keep them from flipping on you, I would suspect they could leak in short order.

EDIT: Sorry for the repeat DrLoch, you beat me to it!

DrLoch · Post by **DrLoch** » Mon May 19, 2014 2:54 pm

Tigerhaze wrote:The JDB pumps have umbrella seals on the shaft they are very easy to damage when installing them. if you didn't use the proper tools or method to keep them from flipping on you, I would suspect they could leak in short order.

Sorry DrLoch, you beat me to it!

Been there, done that... got eh dirty tee shirts to prove it.

jtrichard · Post by **jtrichard** » Mon May 19, 2014 6:21 pm

The rebuilder put the shaft in on my pump and rolled one one the seals next thing i know i have a pan full of fuel took the pump back to the rebuilder he pulls the shaft and says you screwed up the seal when you put the shaft in i had to tell him i did not even know that the shaft came out like that ....you guys put the shaft in so YOU screwed the seals up.......... he replaced them

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350B Hydraulic oil in crankcase

350B Hydraulic oil in crankcase

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