TM 9-4940-568-34
2-20
Table 2-7. Crane Troubleshooting (CONT).
1. OVERLOAD SHUTDOWN SYSTEM (OSS) DISABLES CRANE FUNCTIONS,
BOOM UP, BOOM DOWN, TELESCOPE OUT AND HOIST UP (CONT).
(8) Start FRS (TM 9-4940-568-10).
(9) Set crane main POWER switch to
ON position.
(10) Using TELE control lever, telescope
boom out completely.
(11) Adjust clarity of test unit display
using control knob on bottom of test
unit.
(a) If test unit does not indicate
18.4 ft (5.61 m), go to Step 3 of
this Fault.
(b) If test unit indicates 18.4 ft
(5.61 m), go to Step (12) below.
(12) Using TELE control lever, retract
boom completely.
(a) If test unit does not indicate
7.3 ft (2.2 m), go to Step 3 of
this Fault.
(b) If test unit indicates 7.3 ft (2.2 m),
perform Steps (13) through (19)
below and replace tension
load cell (Para 3-28).
Continued on next page.
CALIBRATION TEST (CONT).
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
BOOM
TELESCOPE
CONTROL LEVER
