SECTION 3 - CHASSIS, PLATFORM, & SCISSOR ARMS
31215079
3-73
Diagnosis of Actuator
The common failure modes that are found in the actua-
tor are as follows.
Description
Item Check List
Action
Throttle actuator plunger or rod separation
Inspect the actuator. Check if the plunger and threaded rod have
separated or if the threaded rod spins in the plunger.
Replace the actuator
Ground fault
Make sure that the actuator harness is not damaged.
Replace the harness if damage is
found.
Inspect the ground wire connection.
If necessary remove the ground or
chassis connection and clean the
paint or oil from the connection
location.
Blown fuse
Examine the respective 30 Amp fuse to confirm if it is still good.
Blown fuse can indicate coil burnout.
If the fuse has been overloaded/
burned-out, replace the respective
fuses.
Throttle actuator coil burnout
Coil burnout will result if the plunger is not able to fully retract or if
the machine switches between high idle and low idle multiple times
in less than a minute.
If the actuator coil is burned-out,
replace the actuator
The actuator coil becomes burned-out due to the following reasons:
• Repeated blown fuses
• The distance between the throttle arm and high idle stop is not
maintained as 0.75 mm (0.030 in)
• If the resistance in de-energized state and energized state is outside
limit
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