How It Works; Testing - Toro Z580 DFI Z Master Service Manual

ELECTRICAL
How It Works
The PTO clutch is composed of three major compon-
ents; the field, the clutch plate, and the friction plate.
The clutch plate always turns with the engine. The
field is a coil of wire wound around an iron core, which
acts like an electromagnet when power is applied. The
friction plate is the only piece that can slide inward and
outward on the crankshaft axis. It is spring loaded away
from contact with the clutch plate. When the clutch is
not energized, the clutch plate rests against the brake
material opposite the clutch plate. When energized the
friction plate is drawn into the clutch plate magnetically
and the two rotate as one component.
6
6-18

Testing

1. Disengage the PTO, set the parking brake, turn the
ignition to the "off" position and remove the ignition
key. Disconnect negative battery cable.
2. Disconnect the clutch harness from the main
harness.
3. Set the multimeter or volt/ohm meter to check
resistance (ohms).
4. Connect the meter lead wires to the clutch wires as
shown (Fig. 543).
Fig 543
5. The meter should read:
Warner clutch: 1.0 – 2.7 ohms,
Ogura clutch: 2.4 ohms
If the reading is above or below these readings, the
field has failed and needs to be replaced. If the reading
falls within the specified resistance, measure clutch coil
continuity (see next).
Z580/Z589 DFI Z Master Service Manual
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