Checking The Interlock Switches - Toro Groundsmaster 4300-D Operator's Manual

Checking the Interlock
Switches
The purpose of the interlock switches is to prevent the
engine from cranking or starting unless the traction
pedal is in the Neutral position, the Enable/Disable
switch is in the Disable position, and the Lower
Mow/Raise control is in the Neutral position. In
addition, the engine should stop when the traction
pedal is pressed with operator off of the seat or if the
parking brake is left engaged.
CAUTION
If safety interlock switches are disconnected
or damaged the machine could operate
unexpectedly causing personal injury.
• Do not tamper with the interlock switches.
• Check the operation of the interlock
switches daily and replace any damaged
switches before operating the machine.
Verifying the Interlock Switch
Function
1. Park the machine on a level surface, lower the
cutting units, stop the engine, and engage the
parking brake.
2. Turn the key switch to the On position, but do
not start the machine.
3. Locate the appropriate switch function in the
diagnostics menu on the InfoCenter.
4. Individually, change each of the switches from
open to closed (i.e., sit on seat, engage traction
pedal, etc.), and note that the appropriate
state of the switch changes. Repeat this for all
switches that you can change by hand.
5. If a switch is closed and the appropriate
indicator does not change, check all wiring
and connections to the switch and/or check
the switches with an ohm meter. Replace any
defective switches and repair any defective
wiring.
Note:
The InfoCenter display also has the ability to
detect which output solenoids or relays are turned
on. This is a quick way to determine if a machine
malfunction is electrical or hydraulic.
Verifying Output Function
1. Park the machine on a level surface, lower the
cutting units, stop the engine, and engage the
parking brake.
2. Turn the key switch to the On position and start
the machine.
3. Locate the appropriate output function in the
diagnostics menu on the InfoCenter.
4. Sit on the seat and attempt to operate the
desired function of the machine. The appropriate
outputs should change state to indicate that the
ECM is turning on that function.
Note:
If the correct outputs do not illuminate, verify
that the required input switches are in the necessary
positions to allow that function to occur. Verify correct
switch function.
If the output displays are on as specified, but the
machine does not function properly, this indicates a
non-electrical problem. Repair as necessary.
Hydraulic Valve Solenoid
Functions
Use the list below to identify and describe the different
functions of the solenoids in the hydraulic manifold.
Each solenoid must be energized to allow function
to occur.
Solenoid
PRV2 Front mower circuit
PRV1 Rear mower circuit
PRV Lift/lower cutting decks
S1 Lower cutting decks
S2 Lower cutting decks
Operating Tips
Familiarization
Before mowing grass, practice operating the machine
in an open area. Start and stop the engine. Operate
in forward and reverse. Lower and raise the cutting
decks and engage and disengage the mowers. When
you feel familiar with the machine, practice operating
up and down slopes at different speeds.
Warning System
If a warning light comes on during operation, stop the
machine immediately and correct the problem before
continuing operation. Serious damage could occur if
you operate the machine with a malfunction.
Mowing
Start the engine and move the throttle to the Fast
position. Move the Enable/Disable switch to the
Enable position and use the Lower Mow/Raise lever
to control the cutting decks. To move forward and cut
grass, press the traction pedal forward.
34
Function