Re: Re: Re: Re: M Farmall Hydraulics

Posted by john d on August 23, 2002 at 19:21:12 from (205.188.209.109):

In Reply to: Re: Re: Re: M Farmall Hydraulics posted by Larry on August 22, 2002 at 21:32:53:

The drive coupler is to the rear of the pump. The pump is driven by the transmission countershaft, which is below the drive shaft coming back from the clutch. The entire pump assembly goes from that cast portion on the bottom with the hole and keyway through it, all the way to the upper regions of the housing, barely clearing the back of the clutch.

There is a sheet-metal access plate behind the pump assembly. Remove it, get a good light and look up behind the pump. You'll find the drive coupler. There are at least two different styles, and they are both pretty simple. Remove the cotter pin, and things will be ready to slide apart as the pump is lowered.

Lowering the pump is an adventure if you haven't done it before! After removing the drive coupler pin and as much of the coupler as may decide to be free for removal, remove the control lever arm on the right side of the tractor. Remove the pipe outlet port on the right side of the tractor. Remove the two pipe outlet ports on the left side of the tractor. Remove the cap from the filler pipe above the control lever. Now the only things that hold the pump in the frame are the 4 bolts on the corners of the pump at the bottom.

DO NOT REMOVE THOSE BOLTS UNTIL YOU HAVE A PLAN WORKED OUT FOR EXACTLY WHAT YOU'RE GOING TO DO WITH THAT PUMP WHEN IT STARTS TOWARD THE GROUND!

Some people use a transmission jack to support the pump. Others use a couple of strong friends and a rod or pipe through the hole across the bottom casting to support it. A piece of all-thread rod can be put in two DIAGONNALY OPPOSITE corners of the pump after removing ONLY those two bolts, and then using hex nuts on the rod to let the pump down. (This may be a little slow, but it DOES work, and you can control the descent!) I have a jack off an early 1950's IH mower that has been modified with a rod to fit the lower part of the pump and a key welded to the rod that keeps the pump from turning on it. That works GREAT, but you likely won't have something like that laying around. I saw my Dad put one up in place and start two bolts by himself when I was a kid. Don't try that unless you are one strong guy!

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