Hydraulic Oil Cooler. An air cooled hydraulic oil cooler is mounted on the
right side of the superstructure. The oil cooler consists of a hydraulic
radiator, a by-pass valve, a fan, and an electric fan motor. The fan draws
cool air through the cooling fins of the oil cooler. All return oil from the
superstructure is routed through the oil cooler.
Pump and Disconnect. The hydraulic pump and disconnect are mounted on
a drive pad of the torque converter. With the disconnect engaged and the
engine and torque converter operating, the pump provides oil to the
The hydraulic pump is a gear-type pump and consists of three sections. The
first section of the pump, the one on the mounting flange end, provides an
output of 39 gpm (147 lpm). The second section provides 39 gpm (147 lpm)
and the third section supplies 16 gpm (61 lpm).
The disconnect assembly is provided for cold weather starting and consists
of a housing, lever, movable collar, and a sliding splined sleeve. The
disconnect housing is connected to the torque converter drive pad and the
pump is bolted to the disconnect housing.
Directional Control Valves. The directional control valves are four way, three
position valves with either an open or closed spool. The valves are grouped
into valve banks permitting simultaneous independent control of crane
functions. The closed spool-type valves are equipped with integral check
valves to ensure components will remain stationary when the valves are
closed. Each valve bank contains a main relief valve. In addition, certain
crane functions are further protected by a circuit relief valve.
Emergency Steer Pump. The emergency steer pump will provide oil flow for
the steering system in the event of an oil flow loss in the main steering
system caused by an engine or steering pump failure. The pump is ground-
driven off of the transmission. This function is automatic, being activated by
a flow switch.
Turntable Assembly and Swing Mechanism
. An anti-friction roller bearing
supports the superstructure and attaches it to the carrier allowing 360 of continuous
rotation (swing) in either direction. The swing function is accomplished through use
of a hydraulically driven motor driving a gearbox which in turn drives the roller
bearing via an external gear. A spring and hydraulically actuated and hydraulically
released brake is provided to stop swing and hold the superstructure in a desired
position, two mechanical swing locks are also provided.
Swing Motor. The hydraulic swing motor is a low speed, high torque motor.
The motor provides indirect drive power for turntable swing through the
Swing Gearbox. The swing gearbox is a sun and planetary gear-type,
driven mechanically by the swing motor. The swing gearbox rotates the
turntable at a reduced operational speed.