Electric Pto Clutch - Toro TITAN Service Manual

PTO Switch Testing

Electric PTO Clutch

Titan Service Manual
3438-774 Rev A
Note: NOTE: The engine will not crank over when the PTO switch is in the
ON position.
The PTO switch provides battery voltage from the ignition switch to the parking
brake switch and the neutral switches as part of the safety interlock system.
1. Remove the control panel from the right console.
2. Disconnect the PTO switch from the wire harness.
3. With the switch in the ON position (button pulled OUT).
4. Using a digital multi-meter set to the OHM or Continuity setting, verify the
following:
• Pin 2 and 5 should have continuity (closed)
• Pin 1 and 4 should have continuity (closed)
• Pin 1 and 7 should NOT have continuity (open)
• Pin 2 and 8 should NOT have continuity (open)
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5. With the switch in the OFF position (button pushed IN)
• Pin 1 and 7 should have continuity (closed)
• Pin 2 and 8 should have continuity (closed)
• Pin 1 and 4 should NOT have continuity (open)
• Pin 2 and 5 should NOT have continuity (open)
The PTO clutch electronically controls the engagement and disengagement
of the PTO pulley (deck belt).
The PTO clutch is composed of three major components:
•
Coil
•
Clutch plate
•
Friction plate
The clutch plate always turns with the engine (crankshaft). 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 moves vertically on the crankshaft. It is
normally spring loaded so that it is not in contact with the clutch plate and is
Figure 93
Page 8–9 Electrical: Service and Repairs