PTO Switch
The PTO switch is mounted on the control panel and al-
lows the cutting decks to operate when the front of the
switch is depressed. An indicator light on the switch
identifies when the PTO switch is engaged.
7. Connect wire harness electrical connector to the
PTO switch.
8.
Install control arm cover to machine (see Control
Arm Assembly in the Service and Repairs section of
Chapter 6 -- Chassis).
The TEC controller monitors the position of the PTO
switch (up or down). Using inputs from the PTO switch
andotherswitches intheinterlock system, thecontroller
controls the energizing of the hydraulic solenoid valves
used to drive the cutting deck motors.
NOTE: To engage the PTO, the seat has to be occu-
pied, the mow speed limiter has to be in the mow posi-
tion and the cutting decks have to be fully lowered.
Testing
1.
Before disconnecting the PTO switch for testing, the
1
switch and its circuit wiring should be tested as a TEC
controller input with the Diagnostic Display (see Diag-
nostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the PTO
switch andcircuit wiring arefunctioning correctly,nofur-
ther switch testing is necessary. If, however, the Diag-
nostic Display determines that the PTO switch and
circuit wiring are not functioning correctly, proceed with
test procedure.
2.
switch(seeControlArmDisassembly intheServiceand
Repairs section of Chapter 6 -- Chassis).
Remove control arm covers to gain access to PTO
Figure 23
3.
connect wire harness electrical connector from the PTO
switch.
Make sure ignition switch is in the OFF position. Dis-
1.
PTO switch
4.
With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
switch position. The PTO switch terminals are marked
as shown in Figure 24. The circuitry of this switch is
shown in the chart below. Verify continuity between
switch terminals.
BACK OF SWITCH
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
Figure 24
ON
2 + 3
2 + 1
5 + 6
5 + 4
NOTE: PTO switch terminals 7 and 8 are for the switch
indicator light. Switch terminals 1, 4, 5 and 6 are not
used on Groundsmaster 4300--D machines.
OFF
5.
6.
exists, check wire harness (see Electrical Schematic
and Circuit Drawings in Chapter 8 -- Foldout Drawings).
Replace PTO switch if necessary.
If PTO switch tests correctly and circuit problem still
Groundsmaster 4300--D
Page 5 -- 25
Electrical System
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