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ELECTRICAL SYSTEMS
Purpose
This clutch electrically controls the engagement and
disengagement of the PTO pulley.
How It Works
The PTO clutch is composed of three major
components: the field, the clutch plate, and the friction
plate. The clutch plate always turns with the engine.
The field is a coil of wire on an iron core which
becomes an electro-magnet when power is applied.
The friction plate is the only piece that can slide up and
down on the crankshaft axis. It is normally spring
loaded so that it is not in contact with the clutch plate
and is pressed against the brake material opposite the
clutch. When power is applied, the friction plate is
drawn toward the clutch plate and the two rotate as
one.
Testing
1.
Disconnect the PTO clutch from the harness.
2.
Connect a charged 12 volt battery to the clutch
(polarity makes no difference.) You should hear a
click, the clutch should engage. If not, check the
wiring and connectors leading into the field. If no
problems can be found, replace the field.
3.
Resistance Check: The field should have a
resistance of 2.9 . ± 20% (2.4 to 3.5 .).
Mechanical Adjustment: The gap between the clutch
and friction plates should be set at .012-.015 inches.
Adjust by rotating the three nuts attached to the field.
7 - 22
Clutch
Electric
Mid-Mount Z Service Manual
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