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Ford Tractors Discussion Forum
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Ford 3930 pto problem

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Rpclark88

12-31-2018 10:57:24




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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?

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Rpclark88

01-01-2019 06:23:49




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 Re: Ford 3930 pto problem in reply to Rpclark88, 12-31-2018 10:57:24  
Quoting Removed, click Modern View to see

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.

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Bern

12-31-2018 16:04:51




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 Re: Ford 3930 pto problem in reply to Rpclark88, 12-31-2018 10:57:24  
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.



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rpclark88

01-01-2019 06:16:59




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 Re: Ford 3930 pto problem in reply to Bern, 12-31-2018 16:04:51  
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?



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Bern

01-01-2019 08:21:07




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 Re: Ford 3930 pto problem in reply to rpclark88, 01-01-2019 06:16:59  
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.

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rpclark88

01-03-2019 06:59:17




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 Re: Ford 3930 pto problem in reply to Bern, 01-01-2019 08:21:07  
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.



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RickB

12-31-2018 15:36:25




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 Re: Ford 3930 pto problem in reply to Rpclark88, 12-31-2018 10:57:24  
I donít know, but you can plan on a rear split to find out.



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