856 hydraulics

Pilot199 · Nov 10, 2017

I've got a '69 model IH 856 with the 361D engine located on pasture land we have out of state. When I put the tractor in the shed on our last visit all worked fine. On this most recent trip there the tractor fired right up, after checking all fluids, but when I went to drive it out I found that I had no steering & no brakes.

The 3 pt worked fine & I was able to operate the implement on the remote valves too. My time there was short so all I had time to do was to look for oil on the ground but there was none. The only thing that stood out was there was a slight amount of oily film on the area where the brake pedals attach.

I believe that there are two hydraulic pumps on this tractor, so other than filters, what should I look for? Any help is appreciated.

Gary

rustyfarmall · Nov 10, 2017

May have just lost its prime, and allowing the tractor to set and run for awhile might cure it. Over-filling the trans by 5 gallons or more might also fix it.

Pilot199 · Nov 10, 2017

Thanks Rusty, I'll give it a try when I get there next month. The tractor usually sits for about 60 days between our trips up there.

Gary

IHTimmy · Nov 10, 2017

Be low on mcv were there a sending unit below it is plug take a 5/8 wrench to remove take plug out Crank it or start it until all shoot out Install plug started up you should have steering and a mess

Pilot199 · Nov 10, 2017

Thanks IHtimmy, so are you thinking that I've got sludge build up in this thing?

IHTimmy · Nov 10, 2017

Maybe but I think you have a weak mcv in pump

Pilot199 · Nov 11, 2017

OK, I'll check it out next trip to the farm. Thanks again,

Gary

caterpillar guy · Nov 11, 2017

Lost prime. Probably will ultimately need a new pump. NOw how does an 856 have a D-361 in it. They came with a D-407 So did somebody change it out in the past?

Pilot199 · Nov 11, 2017

Caterpillar guy,
When you say the pump may need changing do you mean the MCV assembly? If so is this something that I can do under the shed with basic tools?

As for the D361 engine, I bought this tractor from a 91 yr. old WWII vet who's small business rebuilt & sold the larger, used IH tractors. (roughly 706 & above). He had an extra D361, maybe from a salvaged tractor, on his lot & used it to replace the engine in this 856 since it had apparently been run with little oil resulting in a cracked block, or so I was told.

I talked with several on this site about the D361 change & most spoke very highly of it & a couple of guys preferred the D361 over the D407, so I went with it.

I've had the tractor for 2 yrs. now & it's worked great up until this problem.

My big issue will be whether to attempt changing it out at the farm or having it done by a professional.

Thanks,

Gary

856 hydraulics

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