Page 28 | Stellar
®
Heavy-Duty Telescopic Crane Owner’s Manual
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
proportional valve.
• Check to see if the manual override on the proportional valve is turned out. Turn the
manual override on the ow valve in.
Problem: Crane operates slowly.
Solutions:
• Make sure that the crane is receiving the recommended hydraulic ow to operate.
• Check the level of hydraulic uid in the reservoir. Add uid as needed.
• Check hydraulic uid temperature.
• Check to see if the valve bank orice is plugged. If so, replace the orice. Call Stellar
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