Swing System Operation; Swing Brake And Swing Lock; Swing Right Or Left - Manitowoc 999 Service And Maintenance Manual

INTRODUCTION

SWING SYSTEM OPERATION

See Figures 1-9 and 1-10
Swing handle (1) is inoperable when swing brake (2) is
applied and the swing lock (3) is engaged. The rotating bed
is free to coast if swing lock is disengaged, swing brake is
released, and swing handle is in neutral position. Swing
speed and swing torque can be selected for type of work
being performed. See Swing Speed/Swing Torque diagnostic
screen on digital display in 999 Operator Manual.
For swing brake and swing lock operation, charge pressure
from rear drum pump must be above 200 psi (14 bar) for full
release of swing brake and swing lock. If swing charge
pressure is below above pressure, swing brake could be
partially spring-applied and damage the swing brake. Swing
pressure senders (6) monitor the pressure on swing left and
swing right sides of swing closed loop system. This
information is sent to the PC to control the coasting effect.
The PC does not control the fixed displacement swing motor
(9). The swing motor is controlled directly by the output fluid
volume of the swing pump. An orifice (7), across swing motor
ports A and B allow smoother fluid flow when shifting swing
directions.
999CSM1-108
+
F15
5A
5D
10A
CB7
K1
8
50 AMP
OFF
LEFT
RIGHT
SWING
3 1
F4
8 8D
5A
F8
8T
8
5A
F7
8S
8
15A
1-16
ENGINE
RUN
STOP
STOP
5DA
F12
REGULATED 10V DC OUTPUT
3A
DIGITAL DISPLAY
UP SCROLL
DOWN SCROLL
CRANE MODE
CONFIRM
SELECT
SEAT SWITCH
SWING RIGHT
PRESSURE TRANSDUCER
SWING LEFT
PRESSURE TRANSDUCER
SWING PARK BRAKE
CONSOLE SWITCH
3 8
HOLDING BRAKE SWITCH
Published 05-16-17, Control # 233-03

Swing Brake and Swing Lock

After start-up, place swing brake switch (8) in off - park
position. The swing lock engage solenoid HS-9 opens. The
swing lock disengage solenoid HS-10 closes, disengaging
locking pins from slots in shaft locking flange. Swing brake
release solenoid HS-8 shifts to block tank port and supplies
hydraulic charge pressure from rear drum pump to
hydraulically release brake. If brake pressure or electrical
power is lost when operating, brakes spring-apply.
Before shutdown, place swing brake switch in on - park
position. Swing brake release solenoid HS-8 opens to
exhaust fluid back to tank and swing brake spring-applies.
Circuit to swing lock disengage solenoid HS-10 opens.
Circuit to swing lock engage solenoid HS-9 closes to
engaging locking pins into slots in shaft locking flange.

Swing Right or Left

When swing handle is moved to the left an input voltage of 5
volts or more is sent to the PC. The PC sends a negative
output voltage to swing pump EDC (4). Swing pump
swashplate tilts relative to control handle movement. Fluid
flows from swing pump port B to swing motor port B, moving
rotating bed to the left.
START
3
7
8P1
0
WA-01
25
WA-08
WD-19
WD-18
25A
WB-26
WB-33 PROGRAMMABLE
CONTROLLER
WC-24
WB-09
WB-10
WB-34
WC-27
3 6
WA-25
WA-26
WD-15
10 3
999 SERVICE/MAINTENANCE MANUAL
_
K1
MS1
SYSTEM FAULT
BUZZER
OPERATING LIMIT
BEEPER
SWING PUMP CONTROL
B A
EDC
3
4
SWING/TRAVEL ALARM
HS
9
HS
10
HS
8
FIGURE 1-9
0