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1. Diagnostic light
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
N
position, the Enable/Disable switch is in the
EUTRAL
D
position, and the Lower Mow/Raise control is in
ISABLE
the N
position. In addition, the engine should stop
EUTRAL
when the traction pedal is pressed with operator off 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
Service Interval: Before each use or daily—Check the
operation of the interlock switches.
1. Park the machine on a level surface, lower the cutting
units, stop the engine, and engage the parking brake.
2. Turn the key in the ignition switch to the O
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.
g021272
Figure 42
N
Note: 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.
Note: Replace any malfunctioning switches and repair
any damaged or worn 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 the 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 O
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.
Note: The appropriate outputs should change state to
indicate that the ECM is turning on that function.
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 the 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 understand the different
functions of the solenoids in the hydraulic manifold. Each
solenoid must be energized to allow the function to occur.
Solenoid
MSV2
MSV1
SVRV
position,
SV1
SV3
SV2
33
position and start the
N
Function
Front reel circuit
Rear reel circuit
Lift/lower cutting units
Lift/lower front cutting unit
Lift/lower rear cutting unit
Raise any cutting units
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