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Testing
1.
Disconnect the switch from the wiring harness.
2.
Verify that continuity exists between the terminals
listed for the switch position. Verify that there is
NO continuity between terminals not listed for the
switch position.
Figure 226
Electric (PTO) Clutch
Purpose
This clutch electrically controls the engagement and
disengagement of the Power Take Off (PTO) pulley.
400XT Series Tractor Service Manual
Location
The electric clutch is located on the PTO end of the
engine crankshaft (Figure 227).
How It Works
The PTO clutch is composed of three major
ignitionswitch2
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 electromagnet 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
If the electric PTO clutch is not engaging or is
suspected as a cause of electrical problems, use the
troubleshooting steps. These procedures will help you
determine if the clutch has failed or is the cause of the
electrical problem.
Coil Resistance Measurement
1.
Disengage the PTO, set the parking brake, turn
the ignition key to OFF and remove the key.
2.
Disconnect clutch wire connector.
ELECTRICAL SYSTEMS
Figure 227
MVC-838F
4 - 5
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