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870 pto

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Eddie 7295

06-18-2013 17:50:32

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Baling hay with a 5800 hesston baler and pto would stop for a split second when the bale was almost full did it twice rebuilt with new new clutchs last year approx 150 hours on rebuild. Any body have any thoughts what might be going on.

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06-20-2013 04:34:27

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 Re: 870 pto in reply to Eddie 7295, 06-18-2013 17:50:32  
Early 70 series tractors had the PTO surge problem because of the amount of oil it took to charge C4 clutch upon clutch being pushed to stop drive. Back in the day there was a "suppression kit" that required some extra plumbing, a new fitting to reduce the flow to the powershift so the flo divider did'nt see the pressure drop. There was a tube that hung down by the right brake with a tight fitting ball inside that held oil that was transferred to the system by oncoming clutch pressure that forced the oil in that tube to suppliment pump flow to maintain the clutch application. We had to remove the top cover of the valve, drill and tap two of the test ports to 1/4" and install the new plumbing. I installed a few of them, worked well.

The pto pin shearing problem was caused by the momentary pressure loss to the pto as C4 filled upon clutch depression. The kit solved that by regenerating oil within the Powershift system. An ingenious fix but good.
There were some changes to the valve and better piston sealing later on and that surge in the pto was eliminated and the add on kit need was eliminated..
This post was edited by mEl at 04:36:04 06/20/13.

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Eddie 7295

06-19-2013 05:27:13

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 Re: 870 pto in reply to Eddie 7295, 06-18-2013 17:50:32  
Yes it is a powershift, and it will start back without doing anything. When you depress the inching pedal you can feel and hear it thru the pto drive line.

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06-19-2013 11:47:59

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 Re: 870 pto in reply to Eddie 7295, 06-19-2013 05:27:13  
Make sure when the PTO lever is in the engaged position that the spool in the flowdivider valve has been moved a the way. Some earlier 70 series did not have the locking ahead feature on the PTO lever to insure they stayed in the engaged position. Make sure your lever remains forward when in use and completely OFF when OFF. Also make sure the trans pressure or flowdivider press, call it what you want, is 180-200 psi. Set it to 200 if you have to adjust it. A service manual will show and describe that process. Being this only stops when the bale is about full, things can't be to bad or it would never start again under load. Rod.

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06-18-2013 20:58:33

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 Re: 870 pto in reply to Eddie 7295, 06-18-2013 17:50:32  
Power shift tractor? Was it when you pushed the clutch (inching pedal)?The hydraulic, and PTO drive through the torque limiter on the early 70 series tractors. When you push the clutch and hear the grunt the torque limiter slips momentarily. When I have my 870 on the chopper in heavy pulling it will shear the shear pins and plug the whole machine.

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06-18-2013 19:55:16

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 Re: 870 pto in reply to Eddie 7295, 06-18-2013 17:50:32  
After it stops for a split second will it restart under load by itself or do you have to shut down the PTO and then restart again?

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