Reference
Only
INTRODUCTION
999 SERVICE/MAINTENANCE MANUAL
1-16
Published 05-16-17, Control # 233-03
SWING SYSTEM OPERATION
See Figures
and
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.
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.
FIGURE 1-9
WA-01
8D
8
WB-10
WB-09
SELECT
CONFIRM
CRANE MODE
8T
0
0
8
WB-26
WB-33
DOWN SCROLL
UP SCROLL
WA-25
WA-26
K1
F4
WC-27
F8
SWING LEFT
PRESSURE TRANSDUCER
SWING RIGHT
SYSTEM FAULT
BUZZER
25A
25
OPERATING LIMIT
BEEPER
PROGRAMMABLE
CONTROLLER
5A
5A
+
_
ENGINE
10A
5D
5A
F15
STOP
STOP
3
RUN
START
7
MS1
K1
5DA
8
8P1
50 AMP
CB7
PRESSURE TRANSDUCER
SEAT SWITCH
WB-34
999CSM1-108
F12
3A
REGULATED 10V DC OUTPUT
LEFT
OFF
RIGHT
SWING
WA-08
WD-18
WD-19
DIGITAL DISPLAY
8S
8
F7
15A
HS
8
WD-15
SWING/TRAVEL ALARM
WC-24
SWING PUMP CONTROL
B
A
EDC
3
1
3
6
3
8
3
4
3
10
HOLDING BRAKE SWITCH
SWING PARK BRAKE
CONSOLE SWITCH
HS
9
HS
10
Summary of Contents for 999
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 297: ...R e f e r e n c e O n l y ...
Page 298: ...R e f e r e n c e O n l y ...