TM 1-1680-320-13&P
0003 00
BOOM POSITION SUPPORT ASSEMBLY
The boom position support assembly consists of upper and lower support assemblies, a height adjuster
assembly, two limit switches, boom position motor, gear drive assembly, a mechanical stop assembly, reaction
arm, and the rotary actuator.
The boom position rotary actuator swivels the boomhead assembly, positioning the cable hook for proper
operation. The actuators maximum operating load is 6500 in. lbs. (734.5 N.m), with a 205 degree operational
range. Limit switches prevent operation when maximum operating load is exceeded.
Rotation is powered by the boom position motor and gear drive assembly. The mechanical stop assembly
regulates to prevent rotation beyond the 205 degree range. Hoist positioning can be adjusted through use of the
height adjuster or reaction arm assemblies.
