A Little Guidance Needed - M Hydraulics

Bryce Frazier

Well-known Member
Hi all! Need some help! I have a Farmall M that just got out of the shop. Picking up a 3 point hitch tomorrow for an M, and made the call this morning that I am going to put it on this tractor, rather than my Super M.

The Super has a wide front, and a canopy, and is better suited to field work. This other M is a narrow front, and it is a little more maneuverable.

Anyways, back to the question. I have an aftermarket, "Mag Pump" that I am going to take off of a parts tractor and put on this M. My plan is to use the belly pump as a reservoir, that should work right?

On the Super, the lines go as follows:

From pump, pressure to the Valve (two way), over flow into the Belly Pump, and then out the bottom back to the pump. The previous owner drilled a hole in the bottom of the belly pump so that they could put the exit line on, to go to the pull side of the mag pump.

Does anyone see anything wrong with doing it this way? Is there a better way I should go about doing it? Thanks! Bryce
 
Make sure you have a pressure relief valve somewhere on that pressure line. Your valve may have one built in. If not, add one.
 
I don't know about a pressure relief valve, but I know it has a bypass valve, so that if you aren't actually using the hydraulics, it just circulates fluid.
 
That is not the same thing. Pressure relief valve is plumbed into pressure side after fluid leaves pump. Need to protect whole system in case of too big aload for any reason.
 
Ahhh, I see. So I need to put one of those valves in BEFORE pressurized fluid gets to the Spool Valve? Then run an additional line into the return?
 
You are 'plumbing' it right. However,your spool valve probably has a built in relief. Post a pic of the valve,we can advise.BTW,unhook the drive from the bewlly pump. Strip out the pump parts.You wont need em.
 
I went out and looked at the SM System, and they ran the "out" from the valve into the right side pressure line from the pump?! They must have removed all the guts from the pump in order to be able to do this huh? I will separate the pump and see whats in there. I have it on the floor of the shop now.
 
have to pull the timing gear (front engine) cover to replace.

not sure on breakage(someone more smart will help here) but I think the gear for diving pump distributors is stronger then the distributor only gear...or putting it another way the extra load of the pump could shatter the gear that's in it because its too brittle to transfer the torque needed to run pump and ign(????)
 
Interesting?? I will look in the engine that the pump is coming off of, and see if it is a different gear. I could see cold, thick oil, on a -10 degree morning causing some breakage!
 
If the M is newer than 1951 and a half, the cam gear will be OK. if older it will likely be easily broken from the strain of driving the pump. Any SM,SMTA or 400/450 gear will be much stronger. If the front housing has the pattern for the later SMTA style pump in place it likely has the better gear. Jim
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top