Electric Pto Clutch Replacement - Toro Z MASTER 4000 Series Service Manual

PTO Switch Test (continued)

Electric PTO Clutch Replacement

Electric PTO Clutch Removal
4000 Series Z MASTER® Service Manual
3442-427 Rev A
g349741
3. Using a digital multi-meter set to the OHM or Continuity setting, verify the
following:
• Pin 2 and 4 should have continuity (closed)
• Pin 6 and 8 should have continuity (closed)
• Pin 2 and 1 should NOT have continuity (open)
• Pin 6 and 5 should NOT have continuity (open)
4. With the switch in the OFF position (button pushed IN):
• Pin 2 and 1 should have continuity (closed)
• Pin 6 and 5 should have continuity (closed)
The PTO clutch electronically controls the engagement and disengagement
of the PTO pulley (deck belt).
The PTO clutch is composed of three major components:
•
Field
•
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
pressed against the brake material opposite the clutch plate. When power is
applied, the friction plate is pulled toward the clutch plate and the two rotate as
one. When the clutch plate and the friction plate rotate as different speeds it
is known as clutch slipping.
1. Park the machine on a level surface and disengage the PTO. Stop the
engine, wait for all moving parts to stop and remove the key. Engage the
parking brake.
2. Disconnect the battery by removing the negative cable first, then the positive
cable from the battery.
Figure 85
Page 8–9 Electrical: Service and Repairs