Toro Groundsmaster 7210, Service Manual

Page: 222 / 342

IMPORTANT
During the operation of the machine, if the PTO shuts down and
the console temperature warning light is illuminated because of
excessive engine coolant temperature, avoid shutting off the engine.
Under this condition, push the PTO knob down, slowly drive to a
safe flat area, move the throttle lever to the S
LOW
position, move
the traction control levers into the N
EUTRAL LOCK
position, and set
the parking brake. Allow the engine to be idle for several minutes
while it cools to a safe level, and check the cooling system before
returning the machine to service.
Testing the PTO Switch
1. Before you disconnect the PTO switch for testing, ensure that you test the
switch and its circuit wiring as a SCM input; refer to Standard Control Module
(page 5–3) .
2. If the SCM verifies that the PTO switch and circuit wiring are functioning
correctly, then no more switch testing is necessary.
3. If the SCM determines that the PTO switch and circuit wiring are not
functioning correctly, then test the PTO switch as follows:
A. Ensure that the key switch is in the O
FF
position and locate the PTO
switch for testing.
B. Disconnect the machine wire harness electrical connector from the PTO
switch.
C. The PTO switch terminals are identified as shown in Figure 151 . The
circuitry of the PTO switch is shown in the Circuit Logic Table (page 5–26) .
With the use of a multimeter (ohms setting), test the switch functions to
determine if the continuity exists between the various terminals for each
switch position. Check the continuity between the switch terminals.
D. Replace the PTO switch if necessary.
E. If the PTO switch testing is correct and the circuit problem still exists,
check the wire harness; refer to the Electrical Schematics and Wire
Harness Drawings/Diagrams in Appendix A—Foldout Drawings.
F. Connect the machine wire harness connector to the PTO switch. Check
the operation of the PTO switch.
Circuit Logic Table
Switch Position Closed Circuits Open Circuits
O
FF
(D
OWN
) COM B + NC B
COM C + NC C
COM B + NO B
COM C + NO C
O
N
(U
P
) COM B + NO B
COM C + NO C
COM B + NC B
COM C + NC C
Electrical System: Testing the Electrical Components Page 5–26 Groundsmaster 7210
16222SL Rev C