TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
16. MAIN FRAME, HOOK ARM, AND WINCH DO NOT OPERATE (continued).
CONTINUITY TEST
~
(1) Remove four screws and lockwashers
and access panel from heater
ACCESS
compartment.
COVER
(2) Remove four screws and lockwashers
CAB
from cab control box.
CONTROL
(3) Remove six screws from cab control
BOX
box and separate upper body from
UPPER
base.
BODY
CAUTION
Electrical power must be shut off
from circuit before continuity can
be checked. Failure to comply
with this caution may result in dam-
age to test equipment or electrical
system.
(4) Disconnect wiring from components.
(5) Set multimeter to ohms position.
NOTE
BASE
A reading of infinity indicates an open
circuit.
LOAD FUNCTION
SWITCH
(6) Connect multimeter leads to UNLOAD
switch terminals, positions "NC" and
"COM," and hold joystick in UNLOAD
position. Check multimeter for
continuity.
(7) Connect multimeter leads to LOAD
switch terminals, positions "NC" and
"COM," and hold joystick in LOAD
position. Check multimeter for
continuity.
UNLOAD FUNCTION
SWITCH
4-355
