LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED
BODY EXTERIOR - CONTINUED
Upper control valves are attached to the front turret winch sheave head. Derrick leg elevation, rotation, and extension are
controlled from the main basket with the hydraulically powered upper control valves.
The "trombone, control tubes are 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.
Rearview mirrors are attached to the left and right doors of the M876 Truck cab. The rearview mirrors provide visual
control of traffic flow during highway travel. Mirrors are adjusted from the cab driver's and passenger's positions.