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Case Tractors Discussion Forum

Follow-up re Hydraulic Leaks on 311

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Author  [Modern View]

11-19-2011 04:38:14

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Thanks for the replies to my previous post.

I pulled the dust cover on the timing hole and probably a pint of hydraulic oil poured out. So, if I understood your comments correctly, this means the leak is probably from the hydraulic control valve. 1. Is this correct? 2. How do I best get to it? Does the tractor have to be split or can I get access by removing sheet metal? (Have learned that parts diagrams don't show where individual units actually are mounted!)

Thanks again: hope to get this fixed before snow blocks the barn, so will be able to get going promptly when vegetable season starts in the spring.


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11-20-2011 14:10:03

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 Re: Follow-up re Hydraulic Leaks on 311 in reply to MapleSprings, 11-19-2011 04:38:14  
THANKS very much -- again!

My mechanic is VERY good but much more familiar with Olivers and Farmalls: not too many older Case farm tractors right around here.

Now we're in good shape and I'll be sure to report after the repairs are finished. I have new plans for how to use the 311 next year and i appreciate your help in getting her ready.

Happy Thanksgiving to all.


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11-19-2011 11:05:22

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 Re: Follow-up re Hydraulic Leaks on 311 in reply to gusbratz, 11-19-2011 04:38:14  
The only problem area might be removing the steering u joint from the steering gearbox input shaft, mostly a matter of taking the time to do the whole thing. Check the clutch disc for being covered in oil. I soaked mine in stanisol and then sprayed with brake cleaner and it has worked well.

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Joe (Wa)

11-19-2011 08:18:45

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 Re: Follow-up re Hydraulic Leaks on 311 in reply to MapleSprings, 11-19-2011 04:38:14  
third party image

third party image

third party image

Hyd oil from the engine timing hole indicates the hyd pump drive shaft seal and/or main drive shaft seal is leaking oil into the flywheel/clutch area.

The shaft seals reside in the tachometer & hyd pump drive housing. You will have to split the the tractor the same as doing a clutch job as in pic #1.

Pic 2 is what you see as split. The leaking seals are in the assembly marked "Tachometer drive housing". Slide the bearing and spring off the shaft. Remove the clutch yoke. Unscrew the tachometer drive at the top of torque tube. Remove the 4 cap screws on the drive housing assembly and slide it out.

Pic 3 is a breakdown of the tachometer/drive housing assembly. Shaft seal G10422 is the hyd pump drive shaft seal. The main drive shaft seal is G10421 for tractors before serial nr 6097696 and G13816 after. 310 will be the former p/n unless the hyd pump has been replaced with the later style.

Shaft seals are avail from Case or crossed to Chicage Rawhide p/n and avail at Napa.


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Joe (Wa)

11-19-2011 08:41:51

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 Re: Follow-up re Hydraulic Leaks on 311 in reply to Joe (Wa), 11-19-2011 08:18:45  
third party image

There are only 3 bolts in the cover not 4. Here is another view. The shifter plunger pulled out to the front of the tractor disengages the drive gear in the pic above from the hyd pump driven gear. The spring in this pic must be reinstalled with the small diameter end toward the rear of the tractor.


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