Any looking for a tractor DYNO???

Place about 4 miles from me has one for sale. Says it works but do not know. What is something like that worth and is it even worth owning??

The smaller M&W units will bring $1500-2500 in working order and twice that if real nice.

This is small unit 2 tires on it and a PTO shaft. I have not looked at it real close and have no idea how the even try to use one. Has a MPH gauge on it and another one but did not read what is did

Old most of the smaller units are just a tachometer to tell you the PTO shaft speed and then a pressure gauge that is marked in horsepower at certain PTO speeds. So the pressure gauge is measuring torque and the tachometer PTO shaft speed. The internals are a hydraulic pump with a valve to restrict the out put so the pressure goes up. That creates the torque/pressure the gauge reads.

They are accurate if you do not slow the PTO speed under the rated speed. Guys used to "cheat". Most farmers would watch the horsepower/pressure gauge and not the PTO speed so the operator would pull the PTO speed under the rated speed. This would make the torque be higher but not the actual horse power.

Example: Lets say a tractor was rated at 75 PTO horsepower. IF it has a 540 RPM PTO your reading would only be correct at 540 RPM. So if you pulled the PTO speed down to 500 then the gauge might show the tractor had 80 PTO horsepower.

A neighboring JD dealer here, had customers convinced he had JD set his ordered tractors at a HIGH horsepower. He would prove it to them by Dynoing the tractors for them. HE would stand with his hand over the PTO speed gauge. Not very many ever realized he was scamming them.

Surly a JOHN DEER dealer would not do something like that.. I thought they were all saints..LOL I knew one worse than that he would set the M&W on half scale then a 45 hp would read 90 , sure fooled a lot of folks.

When I went to farm mechanics school in 1969 we had a M&W that topped out at a little over 100 horses. We cranked a 1206 down on it and two of us had to sit on one side of the dyno to keep the wheel on the ground. I've always wanted one just to warm up the old tractors once a year but I've never wanted to spend the money for it.

please tell me how you set m&w at 1/2 scale i have run M & W dynos sense 1958 and i dont know how the set 1/2 scale

I know a guy who has one but the plumbing is partly rotted out.

I sold a 90hp M&w four years ago and got $200 for it. It was in fair condition.

I am looking for one, can you send pictures?

I do not have any picture of it. Guess if I remember I could take some next time I go to town

If it looks OK, I would be interested.

From what I saw it looks ok. Ya it looks used but it is used. Paint not real good but gauges etc look to be in good shape. Oil tank was full of oil also