56 10621 Owner’s Manual56 10621 Owner’s Manual
Problem: Winch “Up”, Main Cylinder “Down”,
and Extension Cylinder “Out” are the only
functions that don’t operate.
Solutions:
• Make sure that the unit 2-block weight and
chain on the end of the boom ar
e straight so
they slide easily along the wire rope cable.
• Make sure that the limit switch is working
properly. Disconnect the two wires
connected to the limit switch and tie them
together. If all functions operate, replace the
limit switch.
• Make sure that the cord for the cord reel is
undamaged. Check the continuity of the
cord. Disconnect the cord reel from the
crane harness and bypass the harness
connection. If the crane operates properly,
replace cord reel.
Problem: Crane operates slowly.
Solutions:
• Make sure that the crane is receiving the
recommended GPMs to operate.
• Check the level of hydraulic fluid in the
reservoir. Add fluid as needed.
• Check to see if the valve bank orifice is
plugged. If so, replace the orifice. Call Stellar
Customer Service for instructions.
• Make sure the proportional valve is receiving
12V power when fully engaging the
transmitter trigger. If there is not 12V power
while pulling the trigger, check for loose
connections inside the transmitter or replace
the handle trigger assembly. If the
proportional valve is receiving 12 volts, loosen
the solenoid holding nut and check to see if
the solenoid coil is magnetizing. If no polarity
is present, replace the coil. If coil is
magnetizing, remove the stem valve,
thoroughly clean, lubricate, and reinstall the
valve.
Problem: Cylinder drifts outward or downward.
Solutions:
• Check to see if there is air in the hydraulic
system. Operate all cylinders connected to
the hydraulic system. Start with the extension
cylinder, then operate the main boom,
winch, r
otation, and ending with the
hydraulic outriggers, if installed. When
operating, extend each cylinder halfway out,
retract all the way in, and then extend until
the cylinder rod is at the end of its stroke.
Operate cylinders slowly so air is pushed thru
the system to the reservoir. Repeat this cycle
2-3 times.
• Make sure the holding valves are operating
properly. Remove, clean, and then inspect
each holding valve. When removing a
holding valve, always relieve the pressure
inside the cylinder by loosening jam nut of
the holding valve and turning set screw
inward/clockwise. Count the number of turns
until the set screw is seated. When
reinstalling the holding valve, make sure the
valve is reset by turning the set screw the
number of turns it took to relieve the pressure.
Finish by tightening the jam nut.
• Check the cylinder rod for scratches. If a
scratch is located on the cylinder rod,
hydraulic fluid can pass thru and cause a loss
of pressure. Replace cylinder rod or cylinder.
• Check to see if the piston seals are
damaged. If they show signs of damage,
install a new cylinder seal kit.
Problem: Crane only operates at full speed.
Solutions:
• Check to see if there is 12V power constantly
going to the pr
oportional 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 flow valve in.
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.
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