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TM 5-5420-279-23
CRANE - BOOM EMERGENCY LOWERING SWITCH
This task covers:
a. Remove
b. Service
c. Install
INITIAL SETUP:
Tools Required
Tool Kit, General Mechanic's, Automotive (GMTK)
Materials Required
Thread locking compound, loctite 243
Hydraulic fluid
Equipment Conditions
Crane in the stowed position
WARNING
INJURY FROM EXTREME HYDRAULIC OIL PRESSURE. THE SYSTEM MUST BE
DE-PRESSURIZED BEFORE CARRYING OUT ANY WORK ON THE BOOM
EMERGENCY LOWERING SWITCH.
INJURY FROM EXTREME HYDRAULIC OIL PRESSURE. THE CRANE MUST BE IN
THE STOWED POSITION BEFORE REMOVING ANY OF THE HYDRAULIC PIPES
CONNECTED TO THE BOOM EMERGENCY LOWERING SWITCH.
SLIP AND FALL INJURY. PERSONNEL MAY SLIP ON SPILLED HYDRAULIC
FLUID. SUITABLE CONTAINERS AND FLUID ABSORBENT MATERIALS ARE TO
BE USED TO CONTAIN SPILLAGE.
NOTE
The Boom emergency lowering switch is located on the lifting cylinder. If the lift cylinder
is fully extended and the overload protection device switches off crane operations, the
boom can be enabled by operating the boom emergency lowering switch. See operator's
manual TM 5-5420-279-10.

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