TM 9-4940-568-34
2-17
Table 2-7. Crane Troubleshooting (CONT).
(1) Loosen four screws and remove four
clips from crane main junction box
cover.
(2) Open cover from junction box.
(3) Connect junction box terminals 1
and 19 using jumper wire.
(4) Disconnect top connector from OSS
box.
(5) Start FRS (TM 9-4940-568-10).
(6) Set crane main POWER switch to
ON position.
(7) Attempt to operate boom and hoist
functions using BOOM “UP & DOWN”,
TELESCOPE “OUT” and HOIST “UP”
control levers.
(a)
If functions do not operate,
perform Steps (10) through (12)
below and go to Step 4 of this
Fault.
(b)
If functions operate, perform
Steps (8) through (14) below
and go to Step 2 of this Fault.
(8) Position boom so that OSS box is
accessible for repairs.
(9) Telescope boom out completely.
(10) Set crane main POWER switch to
OFF position.
(11) Shutdown FRS engine.
(12) Remove two screws and disconnect
wires from crane junction box,
terminal 18.
(13) Disconnect jumper wire from crane
main junction box terminals 1
and 19.
(14) Connect connector to OSS box.
OPERATION TEST
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical
circuits a direct short may result. Damage to equipment, injury or death to personnel may result.
Do not stand under crane. Mechanical failure and operator error can cause injury or death to personnel.
CRANE POWER
SWITCH
SCREW
TERMINAL 18
BOOM
CONTROL LEVER
HOIST
CONTROL LEVER
TELESCOPE
CONTROL LEVER
TERMINAL 19
TERMINAL 1
COVER
CLIP
JUNCTION
BOX
