Farmall Hydrauic Problems

Scott Schotz · Jan 21, 2009

Hi,
I just had my H restored and decided to put a original loader on. The owner of the loader said the cylinders were in good shape. I mounted it, refilled the belly pump w/oil, and hooked it up. When I lifted the loader it ------ out oil in both cylinder vents. People advised me that it was a cylinder problem. Rather than paying a lot of money for a rebuild job, I picked up 2 more cylinders off a simliar loader and when I tried it, the same thing happened, oil spewed out of the cylinders vents again. Do I have 4 wore out cylinders or is there another problem? possibly the belly pump? frustrated.
any advice would be great!
Thanks
Scott

mkirsch · Jan 21, 2009

Did the loader go up?

If so, the vents should be plumbed to the fill pipe on the belly pump, because they act as auxiliary reservoirs for the hydraulic system.

This is common on older straight-arm loaders with one-way hydraulics. Without the extra oil from the tops of the cylinders, the system would not have enough to lift the loader all the way up.

the tractor vet · Jan 21, 2009

No if memory serves me correctly what you are calling vents they should be hooked to the fill tube as since a old H or M does not have a large capacity hyd. system the upper ends of the cylinders held the extra oil . as the loader went up the oil in the cylinders would flow back to the sump in the belly pump . So there should be a hose off the top side of each cyl. that tee's into the fill neck .

Scott Schotz · Jan 22, 2009

Yes, the loader did go up, and when it reached a certain height is started to leak.
Plumbing back to the fill line makes sense. Do I still use the breather/fill/vent cap on the very top of the fill line?
Thanks

Janicholson · Jan 22, 2009

Two options the easiest is to put a hose on the vent ports and put the hose end into a bucket run the loader up and continue until all the oil is out of the top half of the cylinder. (one side at a time, with the top of the cylinder off of the loader, or both at once with two hoses. and two buckets.) Then (making sure the resivoir is full) try it. Cylinders can and do bypass oil as they sit and you could be looking at a non issue. We ran an H with 2.5"X40" rams W/O extra reservoir.
If you choose to go with the upper cylinder as reservoirs, plumb the top cylinders into the bottom of the reservoir with a pair of "T"s into the drain plug hole. It is neater, and prevents some of the mess. It may be necessary to use a cap instead of the vented cap to keep oil in. No issue with the top of the cylinders putting back what the bottoms use up. JimN

Farmall Hydrauic Problems

Scott Schotz

New User

mkirsch

Well-known Member

the tractor vet

Well-known Member

Scott Schotz

New User

Janicholson

Well-known Member

Similar threads