Snorkel SB47JRT - Manual (Page 62)

Chapter 11 – Troubleshooting
56 SB47JRT – 0075522
Symptom
Lower controls do not work.
Upper controls do not work.
Boom functions do not work.
Boom and drive functions seem
sluggish.
Boom jerks while it is extended.
Tip boom extend/retract, jib, and
platform rotate functions do not
work from the upper controls.
Booms drift down.
Possible Cause
Control selector switch is in the plat-
form position.
Ground operation switch not held in
the on position.
Platform overload sensor is tripped.
Battery disconnect switch turned off.
Emergency stop switch at lower and
upper controls is in the off position.
Control selector switch at lower con-
trols is in the lower control position.
Platform foot switch not engaged.
Platform overload sensor is tripped.
The drive/boom switch is in the drive
position.
Hydraulic oil is cold and thick.
Wire ropes are loose.
Boom speed knob set too slow.
The emergency lowering valve is open.
Hydraulic system malfunction.
Corrective Action
Place the switch in the lower control
position.
Hold the ground operation switch in
the on position while operating the
control toggle switches.
If horn is sounding and red overload
light is on or blinking, remove weight
from the platform until the load is at
or below rated capacity.
Place switch in the on position.
Place the emergency stop in the on
position.
Place switch in the upper control po-
sition.
Step down on platform foot switch
while operating controls.
If horn is sounding and red overload
light is on or blinking, remove weight
from the platform until the load is at
or below rated capacity.
Place the switch in the boom posi-
tion.
Use cold weather hydraulic oil as rec-
ommended for weather conditions.
Warm oil before operating the ma-
chine.
Refer the problem to a qualified ser-
vice technician.
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.