TM 9-2320-269-10
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED
DERRICK - EXTERIOR - CONTINUED
Upper Control Valves
Are attached to the front turret winch sheave head. Derrick leg elevation, rotation, and extension is controlled from the
man basket with the hydraulic powered upper control valves.
Trombone Control Tubes
Attached to the right side of the derrick leg. The control tubes supply hydraulic oil pressure to the upper control valves.
The control tubes extend and retract like a trombone at the same time the derrick leg is extended and retracted.
Rear View Mirrors
Are attached to the left and right doors of the M876 truck cab doors. The rear view mirrors provide visual control of traffic
flow during highway travel. Mirrors are adjusted from cab, driver's and passenger position.
TA 222504
1-27
