Mahindra 6500 4X4 transmission over-pressure problem

[Mike Breeze]

My 6500 has a transmission over-pressure problem, gear oil is leaking from the range selector boot. Looking for a vent or baffle but can't find one. I pulled the dipstick and tried to locate the using shop air (90 PSI) but just blew the air nozzle and rag from the dip stick opening with a lot of pressure. Thanks in advance for any help!

 

[SPYDERLK]

Doesnt the trans share sump with the hyd system and use hyd fluid for lube. Is the hyd level hi? Dont know how a pressurized situation would occur unless there is a plugged breather. On my 7520 the breathers are on top of the axle case. Maybe just a bad seal on the range selector ... or overfill.
larry

 

[Mike Breeze]

Not sure...I have 2 dip sticks. 1 is on the right rear of the seat (hyd sump good level) and the other is down by the PTO shaft/speed selector on the right (level aprox 1/4 from full). It uses the same type hyd fluid for both hyd and trans. I have researched both my manuals without any luck (not sure i trust them). I'm still looking for any breathers on the rear axle housing/trans. I'll keep ya in the loop, thanks!

 

[Mike Breeze]

SPYDERLK, Thanks for your post. I got in touch with the local dealer and they looked in their exploded breakdown for parts and located the rear axle/trans breather. It's located directly below the left rear corner of the seat on a block bolted to the housing above the left axle tube hidden by the remote hyd lines. I removed it and cleaned it with carb cleaner an got it working. It's a fitting with a small bolt, lock washer, thin metal cover (hat) and screen bolted the fitting. It has 2 holes in the bottom another screen inside, and 2 more holes in the top. After I cleaned I noticed after assembly it didn't work. I was going to drill more holes but came up with a better fix, added a flat washer between the hat and lock washer and it works great. Thanks again for the assistance!

 

[SPYDERLK]

Yeah, that breathers gotta work. Fluid levels change as hyd accessories are used. It needs to breathe. Glad for your success.
larry