Genie GTH-636 Service Manual page 156

Section 5 • Troubleshooting
TROUBLESHOOTING
Check the Tilt Function
16 Stop the engine.
17 Turn the key switch to the on position. Do not
start the engine.
18 Locate the control relay under the joystick.
Check the relay for functionality.
Note: A fast way to determine if a relay is
functioning correctly is to listen carefully when
activating the relay. When activated, the relay will
make a distinctive 'click' as the relay contacts
switch internally.
19 Activate the fork level functions and, using a
wrench, check for magnetism in the solenoid
valves of both fork tilt manifolds (schematic
items GA and GB). Touch a wrench to the end
of the valve.
Result: The wrench sticks to the valve. The coil
is good. Replace the valve(s).
Result: The wrench does not stick to the
valve(s). Proceed to step 20.
Note: The fork tilt manifolds are the two manifolds
on the hydraulic tank located closest to the bottom
of the tank.
Note: A fast way to determine if a valve coil is
functioning correctly is to touch a wrench to the
end of the valve when the coil is activated. When
energized, the valve will magnetize and the wrench
will stick to the valve; turn the power off and the
wrench will fall.
5 - 8 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
20 Using a multimeter, check for power at the
valve coils.
Result: Power is present at the coils. Proceed to
step 21.
Result: Power is not present at the coil(s).
Repair the wire circuit to the coil(s).
21 Check for continuity in the ground wire circuit
from the fork tilt valve coils to ground.
Result: The ground circuit has continuity.
Replace the valve coil(s).
Result: The ground circuit does not have
continuity. Repair the ground wire circuit to the
coil(s).
June 2007
REV B
Part No. 97487