WACKER Group LTC 4, Repair Manual

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Electrical Troubleshooting Procedures LTC Repair
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7.39 Troubleshooting the Power Winch
See Graphic: wc_gr003160
7.39.1 Lower the tower.
7.39.2 Lower the mast assembly into the cradle.
7.39.3 Turn off the engine.
7.39.4 Be sure the machine’s battery is fully charged (approximately 12V).
7.39.5 Remove the four screws (a) which secure the cover of the winch and
remove the cover.
Pinching hazard. Use extreme care when operating the winch with its
cover removed.
7.39.6 Disconnect the red and black wires at the motor (b).
7.39.7 Place the appropriate winch switch (c) in the up or down position, and
check for battery voltage (approximately 12) between the red and
black wires.
• If 12V is measured the power winch is receiving the correct volt-
age. Thus, the power winch should operate. If it does not operate,
replace it.
• If 12V is not measured, continue.
7.39.8 Remove the control panel (d) from the control box.
7.39.9 Check for battery voltage (approximately 12) between terminals B1
and B2 of the winch switch (e).
• If 12V is measured, the winch switch is receiving the correct volt-
age. Thus, the power winch switch should operate. Check for bat-
tery voltage between terminals A1 and A2 for both the up and the
down positions of the winch switch. If the winch switch does not
operate, replace it.
• If 12V is not measured, continue.
7.39.10 Locate the circuit breaker (f). Remove the tape and check for battery
voltage between the output side (g) of the circuit breaker and ground.
• If 12V is measured at the output side of the circuit breaker but not
at the winch switch, the wiring between the circuit breaker and
the winch switch has failed; repair or replace the wiring.
• If 12V is not measured, continue.
7.39.11 Check for battery voltage between the input side of the circuit breaker
and ground.
• If 12V is measured between the input side and ground but not the
output side and ground, the circuit breaker has failed; replace it.
CAUTION