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Allison transmission with electrically shifted PTO?  If so, most have overspeed control which will kick the PTO out if engine r.p.m.'s go over a certain speed.  Usually, there is an 'overspeed' warning light and if it's on the PTO will not engage.  On most of them as soon as the engine R.P.M. comes down the light will go off and you can shift the P.T.O. again.  Could be something is wrong with the P.T.O. control or the TCM.  Is the 'Check Transmission' light on?   

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7 hours ago, C/K Man said:

Allison transmission with electrically shifted PTO?  If so, most have overspeed control which will kick the PTO out if engine r.p.m.'s go over a certain speed.  Usually, there is an 'overspeed' warning light and if it's on the PTO will not engage.  On most of them as soon as the engine R.P.M. comes down the light will go off and you can shift the P.T.O. again.  Could be something is wrong with the P.T.O. control or the TCM.  Is the 'Check Transmission' light on?   

No, It is a manual 4ish speed. No warning lights. THe PTO is just a big in/out lever. and then a raise/ lower stick.

Nothing as fancy as you secribed. 

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O.K., is the hoist pump mounted directly to the P.T.O.?  If not and there is a shaft, see if the shaft is turning when the P.T.O. is angaged.  Sometimes there is a shear pin in the shaft coupling, it might be broken..

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