Stellar 4500 Manual
10-2
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, rotation, 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.
If problems persist,
please contact Stellar
Customer Service at:
1-800-321-3741
Problem: Two functions operate at the same
time while only toggling one function.
Solutions:
• Make sure that the solenoid valves manual
override sleeves are all in the center position
and do not move when operating a function.
If manual overrides have movement when
operating the crane with the remote, replace
the valves.
• 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.
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