Harper
DB1800
13
Troubleshooting
Throttle and Rockshaft Actuators
The Throttle Cable is pre-set at the factory to
allow the Throttle Actuator to move the
engine throttle from idle to full. If the cable
should ever need replaced, use the setscrew
at the end of the cable to secure it to the
Actuator linkage. Make sure the Actuator is
able to move the throttle from idle to full.
The Rockshaft Actuator does not require
adjustment.
Nozzle Adapter and Motor
The three Clamping Blocks are held with
two bolts each (tighten evenly). The
bolts should be loose enough to allow the
Nozzle Adapter to rotate freely, yet tight
enough to hold the rubber nozzle
securely without shaking or bouncing.
Engine:
Problem:
What to Check:
Engine will not start or shuts off
during operation.
•
Improper control settings.
•
Engine may be low on fuel.
•
Fuel tank vent may be closed.
•
Engine may be too low or too full of oil.
•
Battery charge may be too low.
•
Possible internal problems.
•
Air breather may be clogged.
Adjustments
Nozzle Motor
Nozzle
Adapter
Clamping
Blocks (3)
Rockshaft
Actuator
Rock-
shaft
Throttle
Actuator
Throttle
Cable
