Snorkel TB42J, Operato'S Manual

Page: 62 / 68

Chapter 11 – Troubleshooting
58 TB42J – 0172310
Symptom
Main boom will not lower and the
white envelope restriction light is
illuminated on the upper controls.
Tip boom extend/retract, jib, and
platform rotate functions do not
work from the upper controls.
Booms drift down.
Drive functions do
not work.
Wheels will not turn when
winching.
Only slow drive speed works.
Steer wheels do not turn right or
left on machines with tow option.
Tilt alarm does not work.
Circuit breaker will not reset.
Electrical outlet does not work.
Possible Cause
Normal machine operation when the
boom is in the restricted area of the
working envelope.
Boom speed knob set too slow.
The emergency lowering valve is
open.
Hydraulic system malfunction.
Machine on too steep a grade.
Drive hubs are disengaged.
Low hydraulic system pressure.
Drive hubs are engaged.
The booms are elevated. High range
not selected.
Tow kit steering float valve is open.
Booms are stowed.
Electrical circuit has not had time
to cool.
Electrical system malfunction.
Power supply not plugged in.
GFCI is tripped.
Machine/generator switch not in the
generator position.
Power cord to platform is not
plugged into the AC generator.
Corrective Action
Retract the tip boom until the red en-
velope restriction light goes off and
then lower the main boom.
Turn knob toward fast.
Turn the emergency lowering knob
to close the valve.
Stow the machine and do not oper-
ate until repairs are made.
Lower the booms and drive to a level
surface.
Turn drive wheel disconnect plates
around so nipples point outward.
Stow the machine and do not oper-
ate until repairs are made.
Turn drive wheel disconnect plates
around so nipples point inward.
Completely lower the booms. Place
the drive range switch in the high po-
sition.
Close the steering float valve.
Normal operation. The tilt alarm is not
active until the booms are elevated.
Wait a minute or two for circuit to
cool, then push circuit breaker but-
ton in to reset.
Do not operate machine until repairs
are made.
Plug a source of power into the
power-input connector on the wiring
box.
Push reset button on outlet.
With engine running, place the ma-
chine/generator switch in the genera-
tor position.
Plug power cord into the outlet on
the left side of the lower control panel.