Toro 315-8 User Manual page 149

This clutch electrically controls the engagement and
disengagement of the Power Take Off (PTO) pulley.
The PTO clutch is composed of three major
plate. The clutch plate always turns with the engine.
becomes an electromagnet when power is applied.
The friction plate 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.
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.
1. Disengage the PTO, set the parking brake, turn the
ignition key to OFF and remove the key.
2. Disconnect clutch wire connector.
3. Set the multimeter or volt/ohm meter to check
resistance (ohms).
4. Connect the meter lead wires to the wires in the
clutch connector (Figure 1).
5. The meter should read 2.84 ohms plus or minus
5%. If the reading is above or below these readings,
reading is within these limits, measure the clutch
current draw.
1. Disengage the PTO, set the parking brake, and turn
the ignition to OFF.
2. Disconnect the clutch wire connector.
3. Set the multimeter to check amps (10 amp scale).
4. Connect the positive meter lead to the tractor
terminal (1) of the clutch wire, (Figure 2).
5. Connect the negative meter lead to the
corresponding wire terminal (3), (Figure 2).
6. Connect a short jumper lead from terminal (2) to (4),
(Figure 2).
7. Turn the ignition switch to the "RUN" position and
the PTO switch to the "ON" position.
8. If the meter reading is 3.5 amps or above, the
system is functioning properly. If the meter reading
is below 3.5 amps, check the electrical system for
problems (i.e., the battery, ignition switch, PTO
switch, or wiring harness may be malfunctioning).
GLOSSARY
3-6