John Deere 2750 Clutch Reservoir Overflowing

North Farm Boy · Feb 7, 2015

I have John Deere 2750 tractor with a cab and it has a Hi-Lo shift unit. I was using it this afternoon to clear the snow with a front loader and a snow blower powered by a PTO. Outside temperature was -18C or 0 Fahrenheit.
After about an hour's use, at idle RPM there was a stream of oil that came through the opening around the steering column. I shut the engine down and investigated. The clutch reservoir was covered with oil. After cleaning the area, I started the engine again and the oil came gushing out from the reservoir along with a hissing sound. The oil was milky with air bubbles in it. It had gear oil (hydraulic) consistency and smell, not brake fluid.
About a year ago I replaced the seals on the clutch slave cylinder and I used the correct fluid which is DOT4 brake fluid.

It is not making sense to me so I am hoping you will able to help.

Tx Jim · Feb 8, 2015

The clutch master & slave cylinders are independent from hyd hyd system. Are you positive master cylinder is overflowing? Have you checked hyd oil in trans for milky colored oil?

Cliff Nelson · Feb 8, 2015

Does the slave cylinder have a second line on it that goes up to the shift cover? If so, the hi-lo interlock is probably leaking the oil into the clutch system. Try disconnecting that line (it is the one on the end of the slave cyl) and plug the cylinder. Run the tractor and see if fluid comes out of the open line. I think there was a service bulletin to eliminate the interlock system but I don't remember the reason why. Someone with access to Deere service bulletins from that era could look it up for you.

Tx Jim · Feb 8, 2015

Thanks Cliff as I forgot about the hi-lo interlock.

North Farm Boy · Feb 8, 2015

(quoted from post at 07:15:11 02/08/15) Does the slave cylinder have a second line on it that goes up to the shift cover? If so, the hi-lo interlock is probably leaking the oil into the clutch system. Try disconnecting that line (it is the one on the end of the slave cyl) and plug the cylinder. Run the tractor and see if fluid comes out of the open line. I think there was a service bulletin to eliminate the interlock system but I don't remember the reason why. Someone with access to Deere service bulletins from that era could look it up for you.

Thank you Cliff. i appreciate your explanation. It does make sense. Now the challenge finding this Service Bulletin begins. I will disconnect the line and check as you suggested but not today. It is still cold, -23C. It is certain that oil comes from somewhere and that is the only possible source. Thank you again!

North Farm Boy · Feb 8, 2015

Thank you Jim for your input.

Tx Jim · Feb 8, 2015

This is the parts photo of the interlock line.

Here's the part number of the interlock parts key 47 L40340

North Farm Boy · Feb 8, 2015

Thanks Jim! This parts illustration really helps. I do have a "2750 Tractor Parts Catalog" (12-Apr-85) but it does not have the illustration you posted. Thanks.
Based on the picture, replacing all the seals in the "Item 47" assembly should take care of the problem. (?).
Correction: My parts book does show it on page 52-22. Thanks again Jim!

JD Seller · Feb 8, 2015

I think Cliff is correct. If I remember correctly you just remove the line and cap both ends. I never had many of the smaller Mannheim tractors with cabs around here. The interlock was to shift the Hi-Lo to Lo when you pushed the clutch in IFC.

North Farm Boy · Feb 13, 2015

Thank you all for your ideas and suggestions! Seals replaced..all is well. Operational again!

John Deere 2750 Clutch Reservoir Overflowing

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Tx Jim

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