TM 5-3810-307-24-1-1
SWING SYSTEM
DESCRIPTION
The superstructure has full 360 degrees rotation in
disengaged from the cab. A brake pedal and swing
both directions and is equipped with free swing. A
brake control are used to stop rotation.
positive swing lock and a pin-type swing lock are
both provided to lock the superstructure in position.
The swing system consists of the hydraulic remote
The positive swing lock consists of teeth that mesh
control valve, control valve, pressure reducing valve,
with the swing gear teeth at any point along the 360
brake pedal and power brake valve, two position
degrees of rotation. The pin-type swing lock consists
selector valve, swing drive, and the swing brake
of a round pin and a retainer weldment which locks
assembly.
the turntable with the boom straight over the front or
rear. Both turntable locks are engaged and
THEORY OF OPERATION
The system is supplied by the 16 gpm (60.5 lpm)
5 gpm (18.9 lpm) flow at 250 psi (1723.7 kPa) to the
pump section. The oil flows from the pump to the
swing brake control and the swing brake valve for
outrigger control valve.
Bypass flow from the
application or release of the swing brake. Pilot
outrigger control valve.
Bypass flow from the
pressure signals from the hydraulic remote control
outrigger control valve supplies the swing circuit.
valve in the cab shift the spool in the control valve. If
The bypass oil flows through swivel port 11 to the
the swing brake control is in the disengage position,
pressure reducing valve. The pressure reducing
the superstructure will rotate in the direction selected
valve provides a constant flow to the control valve
by the hydraulic remote control. Shifting the control
bank containing the swing control valve.
The
lever to neutral and depressing the brake pedal will
pressure reducing valve also provides a constant
stop swing.
