Farmall M Hydraulics Questions

Melvin Ware · Feb 4, 2010

I have a 1951 Farmall M with a belly pump. I don't have any hydraulic implements but am considering adding a 3-point hitch. Is there an easy/inexpensive way to check if the pump is working properly before spending the money? I have little experience with hydraulics but was wondering if a gauge would tell me what I need to know or do I need to connect a cylinder?

As a side note, there is a short length of hydraulic hose connected to the left side pressure port and when I engage the hydraulic lever, the hose moves and appears to stiffen.

Also, the left side delayed pressure port is fitted with a plugged elbow that I noticed will swivel 360 degrees. I didn't know if this is normal or if there is a problem with the threads? Don't see any leaks. If this needs to be repaired, is it necessary to remove all hydraulic connections in order to drop the belly pump and if so, how would I best remove this connection assuming it's damaged?

Janicholson · Feb 4, 2010

A gauge that reads to 1000psi connected to that hose, or directly to the fitting will tell you the pressure it can produce. Early tractors were limited to about 500psi, (many were refit with higher pressure relief valve parts to make 800psi) later made 800 or so psi.
I believe that the lefdt pipe elbow should not swivel, it should be tightened (pipe threads).
The fact that the hose stiffens is a good sign. If the fitting will not tighten removal is turning them CCW! Good luck. JimN

mkirsch · Feb 4, 2010

The elbow on the delay port may be a swivel elbow. You can tighten them as much as you want but they will still swivel...

Oil would blow out when you pull the lever if that elbow were loose.

Does it look like a machined part or a water pipe elbow?

Janicholson · Feb 4, 2010

My experience (about 15 M, H, SM, and early SH tractors) I have not encountered a swivel Delay outlet. The on line manual indicated: 4-Elbow Welded 3 (retired)
Interesting idea, how was it done? Jim

Melvin Ware · Feb 4, 2010

Thanks for your comments & suggestions.
I should add that the fitting in the delayed pressure port appears to be a standard 1/2 inch galvanized pipe elbow with a threaded pipe plug in the end. It swivels 360+++ degrees CW and CCW when turned by hand. Turning it either way does not loosen or tighten but I don't see any leaks. The other two pressure port fittings (right and left) are both tight. Assuming it was designed to swivel, how would you get it out to remove the belly pump? I see no place to put a wrench.

D Slater · Feb 4, 2010

The 1/2 inch pipe elbows and nipples screw dirrectly into pump casting. Made to remove and install from the outside of tractor. If thats the regular fitting that turns without tighten or loosening, something is broke or stripped. If the pump has oil in it, can' understand why oil is not comming out the bottom of clutch housing when hydralic lever is pulled back. With all ports pluged a good pump will load engine enough to notice when pump is engaged.

Farmall M Hydraulics Questions

Melvin Ware

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Janicholson

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mkirsch

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Janicholson

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Melvin Ware

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D Slater

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