Ford 3930 pto problem

Rpclark88 · Dec 31, 2018

I just installed a pto into a 3930 that did not come from the factory with one. Clutch, output shaft, plumbing for hydraulics, the whole thing.

I got tractor put back together, filled with oil, and started. The pto shaft spun momentarily, maybe ten seconds, then stopped. With tractor running, and pto lever in any position, it feels like the pto brake is on, I can hardly move the pto shaft with short channel locks. Engine off, I can freely spin shaft by hand.

Thoughts?

RickB · Dec 31, 2018

I don?t know, but you can plan on a rear split to find out.

Bern · Dec 31, 2018

Sounds to me like a control valve issue. Does the handle feel like it has both on and off detent action? If not, maybe the
handle somehow got separated from the spool? If so, you could get to that from the 3-point cover opening.

Rpclark88 · Jan 1, 2019

It does feel like i have action on both detents. Does the engine mounted pump run the three point lift and lower, or the rear end mounted pump? How could i test if the rearend mounted pump is operating correctly, or at all?

Rpclark88 · Jan 1, 2019

(quoted from post at 16:36:25 12/31/18) I don?t know, but you can plan on a rear split to find out.

I'm sure I will have to split it again to remedy the problem, but diagnosis should be possible from the external symptoms.

There was only one way that all the plumbing for internal hydraulics could be hooked up, so that negates anything there

There was only one way for the pto clutch and output shaft to go in

There was only one way the clutch actuator could go in and fit

The only issue I had going back together was with getting the hydraulic pump drive gears to mesh together, so I am leaning towards maybe a broken sprocket on the rear mounted pump. Before taking it off to verify its issues, if any, I'd like to find out how to pressure test it to verify it is working.

Bern · Jan 1, 2019

Engine mounted pump supplies only to the remote valves. Pressure for the PTO comes from the rear pump "piggyback" section (#15 & 17 at the link below).

Pressure testing can be done through the top with the 3-point lift cover removed. Consult repair manual for the exact details.
Pump

Rpclark88 · Jan 3, 2019

Do you have a repair manual or know where I can find one online? I have the parts book but a service manual would
Sure be helpful.

Ford 3930 pto problem

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