ELECTRICAL
8-6
36” & 40” Toro GrandStand Service Manual
8
Operator Presence Control (OPC)
Switch
Purpose
How It Works
The Operator Presence Control (OPC) Switch is part
of the safety circuit. If the PTO is engaged and the
operator vacates the machine, the PTO will shut down
(Fig. 733).
This is a “Normally Closed (NC)” switch. The letters “NC”
will be stamped on the terminals. When the RH control
lever is in the “UP” position, the switch is open and there
is no continuity between the switch terminals.
Fig. 733
IMG-0001a
Testing
Turn the ignition key to the run position (do not start the
machine). While observing the black triangle for the OPC
indicator on the hour meter, move the RH control lever
up and down. If the black triangle turns on and off, the
switch is good.
If the black triangle for the OPC indicator fails to turn on
when the RH control lever is moved up and down, the
switch needs to be checked for continuity.
1. Disconnect the switch from the wire harness.
2. With a multimeter set to the “Ohms” setting or a
continuity light, verify that there is continuity between
the terminals (plunger out).
3. With the plunger pushed in, there should be NO
continuity between the terminals.
Location
The Operator Presence Control (OPC) Switch is located
inside the RH side of the control panel, as part of the RH
control lever assembly (Fig. 734).
Fig. 734
DSCN-2208a
Summary of Contents for GrandStand 74534
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Page 3: ...ABOUT THIS MANUAL THIS PAGE INTENTIONALLY LEFT BLANK ...
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Page 111: ...CONTROLS 4 44 36 40 Toro GrandStand Service Manual 4 THIS PAGE INTENTIONALLY LEFT BLANK ...
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