super a blown hydraulic gasket

scott1953

Member
I recently rebuild the hydraulic pump on my Super A (with the help of this forum). Problem was the pump shaft was worn allowing hydraulic fluid (ISO 32) to leak into the engine oil. I did check to make sure the pressure release ball and spring looked ok...they seemed to be fine.

After reinstalling the pump back onto the tractor I decided to use motor oil in the hydraulics (10w 30). Thinking was if the pump shaft/seal still leaked into the crankcase, it could not contaminate the engine oil(could overfill it)

started the tractor...all is well till I increased the RPMs, lifted the plow...and pop...gasket blew out spraying oil out.

First pic here shows which gasket blew...second one is the gasket itself.

What I'm thinking so far...

The viscosity of the iso 32 oil and the 10w 30 don't seem that different...just sticking my finger in both....probably means nothing..but..
I'm pretty sure the pressure relief ball and spring in the pump were ok
I checked the bolts were tight, although I'm not sure of the torque.
I could have been more careful to clean the mating surfaces where the gasket goes.
In the pics attached, the gasket is the same orientation as when installed so you can see which one blew.

Any thoughts or advice?

As always...thanks for your help. I'd be even more lost without you guys :)

Scott




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You are right! Exactly.

I had the gasket end for end. Big hole where the little hole should have been...I didn't see the hole size difference...

Thank you for the quick reply.

One more question, I have some fiber type gasket material Felpro Karropak it says on the back. If I cut out a duplicate carefully, would that work for this application ok?

Funny, the hole size difference is so obvious now ! Where are those little icons with the guy hitting himself in the head?



Cheers
 
That material should be good to go. I would use aluminum paint on both sides (wait until it was near dry) then assemble and tighten. Jim
 
Imo, not good to contaminate the oil systems.

The engine oil is detergent and likes to entrain particles to carry them to the filter.

The hydraulic oil is non detergent and ideally lets particles settle out to quiet places in the flow. Also typically it has EP "extreme pressure" additives which are ideal for the steel-on-steel gearing in the pump. But the EP additives are not good for bronze.

I am not trying to say you lit a fuse on a firecracker, but I would not add any more engine oil to the hyd system. Once running and stable, I would drain and refill both oil systems with the original lubes.
 

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