Stellar
®
TC Series Telescopic Crane Owner’s Manual | Page 19
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 stabilizers, 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. Note: Before performing any
maintenance on hydraulic components, relieve hydraulic oil pressure from all hydraulic
circuits. 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
uid 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.
Manual Operation
If the remote control malfunctions, follow these steps to operate the crane manually:
1. Activate Flow Control. Turn the override screw on proportional ow control counter-
clockwise. Full adjustment is between three and ve turns.
2. Operate Solenoids. Using the identication decal as a guide, slide the knurled sleeve out
and then push or pull to operate the desired function. Be sure the sleeve is in the center,
locked, position before returning to remote operation.
3. Deactivate Flow Control. Turn the override screw clockwise until stopped. Full adjustment
is between 3 and 5 turns.
4. Return the valve bank manual overrides to the neutral position.
Failure to return the valve bankmanual overrides to the neutral position
can result in unexpected crane movement.
5. Have the unit serviced immediately to restore remote control functionality.
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