42 6000 Owner’s Manual
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.
Problem: Crane will operate manually but
will not operate electronically.
Solutions:
• Make sure the “Power” LED is on outside the
receiver door cover. This light is the upper
light on the receiver door. If the light does not
come on, check wiring back to the fuse. If
the fuse is OK, check system ground wires
and connections.
• Make sure the green LED on the receiver
door is lit green. This light will come on when
the red e-stop is pulled upward and the toggle
switch is activated on the transmitter. If the
radio system does not link up and no green
light is lit on the receiver - make sure that the
battery is fully charged, check the battery
contact points to make s ure they are not
tarnished or corroded. Clean contact points
and recharge or replace the battery.
• When battery voltage is acceptable, the
power LED light on the transmitter will be
solid. If the voltage becomes low, the LED
light will begin to blink and the battery will
need to be charged or replaced.
Problem: Not all crane functions operate
using the radio remote transmitter or crane
operates intermittently.
Solutions:
• Make sure that the function switch is working
properly. If the switch is defective, simply
replace it.
• Make sure that there is power going from the
valve bank twin solenoid or to the function
that will not operate. If no power is going to
the twin 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. Check the twin
solenoid for polarity, if solenoid does not
magnetize, replace the twin solenoid.
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