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John Deere Tractors Discussion Forum
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John Deere 4430 pto problem

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Jeff 4430

07-27-2005 13:48:34




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Problem: The pto lever disengages under normal light duty load conditions. I use this tractor for mowing occasionally and the condition occurs out of the blue. Sometimes I can run for hours with no occurances, other times within minutes.

Any ideas?




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WTW

07-27-2005 14:10:47




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 Re: John Deere 4430 pto problem in reply to Jeff 4430, 07-27-2005 13:48:34  
Jeff, This is a fairly common problem I have seen over the years. Two things can cause this. One is if the lever is resting hard at the end of the slot and rough terrain causes the cab to move working the lever out of position. The cab may need to be tightened up and lever linkage may need to be adjusted. If your tractor is a quad or synchro range model the most common cause for this condition is a aluminum lever / part in the clutch control valve that is broken / cracked causing the PTO latch piston and PTO control valve relationship to be wrong resulting in the latch not holding PTO lever in the ON position. To correct this condition the clutch control valve behind the left battery box will have to be removed. Failed arm will be on the opposite end of PTO valve control shaft where your PTO control rod connect to it. If you have repaired them before I would say it would take a arm, a couple of gaskets and a couple of hours to fix it. Arm works like a teeter totter with the control valve on one end and the latch piston on the other, in your case the plank of the teeter totter is broke / cracked in the middle, It don�t take much of a crack in this arm to cause this situation. Fairly common problem and fix matching your symptom. Good Luck, DW

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