Page 28 | Stellar
®
Heavy-Duty Telescopic Crane Owner’s Manual
the receiver, trace back to the power source and check for a blown fuse or loose ground
connection. Refer to radio remote troubleshooting guide at the end of this chapter.
• Make sure that the parking brake is engaged.
• Make sure that the parking brake switch is working properly. Check the parking brake
switch by performing a continuity test. If the switch is defective, simply replace it.
Problem: Not all crane functions operate using the radio remote transmitter or crane operates
intermittently.
Solutions:
• Make sure that the toggle switch is working properly. If the switch is defective, simply
replace it.
• Make sure that there is power going to the valve bank coil solenoid of the function that will
not operate. If no power is going to the coil solenoid, check wiring connections on wire
harness plug connector for broken wires, loose connection or poor crimp. If power is going
to the solenoid valve, it may not be opening to allow hydraulic oil to the function that is not
operating. Remove stem valve, thoroughly clean, lubricate, and reinstall valve. Do not
over tighten. If the valve will not close, simply replace it.
Problem: Two functions operate at the same time while only toggling one function.
Solutions:
• Make sure that the solenoid valves are all latched in the center position to ensure that they
do not move while operating the crane.
• Determine the function that is operating on its own. Check to see if there is power going
to the solenoid valve from a function that should not be operating. If voltage is present at
the solenoid valve without operating the function, the toggle switch has failed and is stuck
in the “on” function. If no voltage is present, the solenoid valve may be partially open.
Remove the stem valve, thoroughly clean, lubricate, and reinstall the valve. Do not over
tighten. If valve will not close, simply replace it.
Problem: Winch brake will not hold.
Solutions:
• Check to see if the back pressure on the return line of the winch is greater than 50 psi. Try
operating a function other than the winch. Operate the function both ways and then
stop. Now operate the winch. If the brake still does not hold, contact Customer Service at
Stellar.
Problem: Winch will not hold load.
Solutions:
• Make sure that the object being lifted does not exceed the rated capacity of the winch.
Refer to the capacity chart. If the object is within the rated capacity, reposition the truck
and try to lift the object without using the crane boom extensions.
• Make sure that the relief valve on the winch is set correctly. Readjust the relief valve if
necessary.
Problem: Crane only operates at full speed.
Solutions:
• Check to see if there is 12V power constantly going to the proportional valve. If 12 volts
are showing up at the proportional valve without pulling on the transmitter trigger, the
handle/trigger assembly may be defective. If 8 volts are showing at the proportional
valve, it is possible that the valve is stuck open and will not close. Remove the valve,
clean it thoroughly and reinstall. Do not over tighten. If the problem persists, replace the
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