M hydraulic pump

My son found a M forsale at a used car lot. Serial number FBK 7315. The saleman said the hydraulic pump had been added. Did they first come out without a hyd pump, or could you get them either way. My book says its the first year M's were made. Thank You

That is a 39 serial number,the hydralic was optional like the electrical system

That is a 39 serial number,the hydralic was optional like the electrical system

There is an optional (but rarely omitted) hydraulic pump standard on all M Farmalls. The system is located in the torque tube, Chassis, and is called a Liftall. The pump is only operational when the clutch is engaged (not pushed in) this means it stops when the tractor's clutch is pushed. Non-Live hydraulics. It is very useful, and very rarely gives any problems. (of course it is almost 70 years old!)
There is also a Live Pump system is used on late 1953 Super Ms and later tractors. including SMTA, 400, and 450. This pump is retrofitted to older tractors (with front cover, and drive gear changes to improve reliability). It is located in front of the distributoe, and takes the place of a cast distributor drive housing. It is a live pump, and works all the time. Another pump was provided by M&W corp. and fits on the earlier bolt pattern of the drive mount. They work well, but replacement of the drive gears are recommended for strength. (most have been)
The Liftall is a single acting system, (but can be modified by piping and valves to operate two way cylinders. The Live pump can be found in many configurations. from single acting, to multiple outlet dual acting. More info is in the archives, and by asking , JimN

Belly pump was used, but no live hydraulics on your M.

If this is the same tractor I saw at a lot at 21st and KS in Topeka and you are thinking of buying it I would ask lots and lots of questions before I went very far with it. Maybe a fine tractor for $3800, but the dealer didn't impress me to too much. Check out my post from a few days back.