2) PTO DRIVE SYSTEM
problem Causes Counter measures
PTO does not spin with PTO
shifted to ON
PTO shift lever is in neutral Shift lever positively to
ON
Defective PTO switch replace
Clogged PTO valve Wash clean
Poor Pump Replace
Defective solenoid valve Replace
PTO spins but does not
produce sufficient torque.
Worn clutch disc Replace
Broken or fatigues seal ring at clutch sleeve Replace
Loose joint or broken O-ring of delivery
valve
Retighten or replace
Poor pump Replace
Clogged PTO valve Wash clean
PTO does not stop when PTO
switch is shifted to OFF
Defective PTO valve solenoid Replace
Broken clutch piston return spring Replace
Poor switch Replace
PTO follows too much when
PTO switch is shifted to OFF
Improper oil Replace
Insufficient warming up Let tractor warm up
sufficiently
Poor PTO clutch brake Replace
Weak or broken piston return spring Replace
Poor PTO valve (contamination) Wash clean
Deflected clutch plate Replace
5-35
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