Hydraulic Issues

farmall706 · Feb 18, 2011

There was a post about a 856 having issue when first starting about brakes, TA, and Steering not working for a while.

I have a similar problem on my 706, I only notice the steering not working for a few minutes. I usually start the tractor and let it warm up, so I may have issues with the TA and brakes just have not noticed it. Then it works fine after a few minutes.

There was comment to add aditional oil to cover the seal.
What does it take to fix this issue? Is it a big job? Can it be repaired without spliting tractor?

The other comment said just add oil and it will be fine, will there be any longer term issues?

Thanks for your comments.

Travis Atkinson · Feb 22, 2011

I posted about the 856. I added 5 gallons xtra oil and few minutes later it worked. As for fixing I can't see a way to fix it without splitting tractor.I don't think there would be any issues with to much oil due to large cavity oil sits in. I'm no mechanic, wished I knew about this long ago,burned lot of expensive diesel letting in run till things worked right. My tractor was purchased new by my great grandfather & has never been split for any reason.

james Ashcraft · Feb 23, 2011

This may be just a shot in the dark. A few years I purchased a 686 and had the same problems as you described. I don''t know how close the 707 hudraulic pump is to the 686. So I drained the fluid from the belly of the tractor and cleaned the left side where you remove the pump. I removed the outside plate that the pump is bolted to and removed the plate with the pump attached to it. I discovered at the back of the pump is tube with o rings that attaches to filter on the right side of the tractor. The o rings were shot on the tube and that would let air be sucked until the fluid gradually built up pressure. I looked on the caseIH web sight under 706 hydraulic pump and found listed on the exploded view #12 - TUBE ASSY, pump section and this appears to be close to what I have on the 686. I got the part from CASEIH and reinstalled the pump and filled the hydraulic sump with the correct amount of fluid and there was a big time difference in the sound and the way the ps and other hydraulic worked. Hope this helps. Before I started I ordered a manual from the wed sight so help me along.
James

mkirsch · Feb 24, 2011

686 and 706 are completely different.

The issue with the 706 and other large frame tractors is an O-ring that seals between two separate housings for the oil pickup. You have to split the two housings apart to replace the O-ring, which means most of the tractor has to come apart.

Would overfilling as a standard course of action be advisable as a preventative maintenance measure? Keeping the O-ring submerged in oil would slow its decay.

Hydraulic Issues

farmall706

Member

Travis Atkinson

New User

james Ashcraft

Member

mkirsch

Well-known Member

Similar threads