Testing; Electric (Pto) Clutch; Purpose; Location - Toro 260 Series Service Manual

ELECTRICAL SYSTEMS

Testing

1. Before replacing the low voltage module, test the
battery to make sure it is fully charged and is in
good shape.
2. Next check the charging system of the engine;
follow the procedure in the Kohler Engine Service
Manual.
3. If the battery checks out and is in good condition
and the charging system checks out and is
charging properly and the battery light on the dash
is on, replace the low voltage module. Without
specialized test equipment, it is not practical to
test the low voltage module in the field.

Electric (PTO) Clutch

Purpose

This clutch electrically controls the engagement and
disengagement of the Power Take Off (PTO) pulley.

Location

The electric clutch is located on the PTO end of the
engine crankshaft (Figure 229).
Figure 229

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 electromagnet when power is applied.
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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.
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 230).
MVC-209X
5. The meter should read between 2.40 ohms and
3.40 ohms. If the reading is above or below these
readings, the field has failed and needs to be
replaced. If the reading is between these two
limits, measure the clutch current draw.
Figure 230
260 Series Tractor Service Manual
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