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Only
INTRODUCTION
999 SERVICE/MAINTENANCE MANUAL
1-54
Published 05-16-17, Control # 233-03
When cylinder rods retract, fluid exhausting from piston end
of the cylinders is blocked by the free-flow check valve
section on side “A” of counterbalance valves and passes
through the valves' flow restrain sections preset for a relief
pressure of 3,500 psi (240 bar).
Exhaust fluid from side “A” sections of both counterbalance
valves combines, and flow is blocked by the free flow check
valve section on side “A” of load equalizing valve where it
passes through valve's flow restrain section preset at 4,000
psi (275 bar). Restraining section on side “A” of load
equalizing valve opens, controlling flow of fluid out of both
cylinders and ensuring cylinder actuation is balanced.
FIGURE 1-38
999CSM1-137
87F
8D
8
WB-10
WB-09
SELECT
CONFIRM
CRANE MODE
8T
0
0
8
WB-26
WB-33
DOWN SCROLL
UP SCROLL
WA-24
K1
F4
F8
PRESSURE TRANSDUCER
BOOM HOIST
SYSTEM FAULT
BUZZER
25A
25
OPERATING LIMIT
BEEPER
5A
5A
+
_
ENGINE
10A
5D
5A
F1
STOP
STOP
3
RUN
START
7
MS1
K1
5DA
8
8P1
50 AMP
CB7
SEAT SWITCH
WB-34
F12
3A
REGULATED 10V DC OUTPUT
RAISE
OFF
LOWER
BOOM HOIST HANDLE
WA-05
WD-18
WD-19
DIGITAL DISPLAY
HS
13
BOOM HOIST
3
11
3
1
3
4
WC-14
BOOM HOIST
B
A
EDC
WD-37
HS
15
BOOM HOIST PAWL OUT
WD-10
WC-09
3
10
3
9
WE-29
BH
PCP
BOOM HOIST
MOTOR CONTROL
PUMP CONTROL
WD-29
ROTATION INDICATOR
BOOM HOIST
14
HS
BOOM HOIST PAWL IN
WD-36
DRUM BRAKE
BOOM HOIST
SPEED
ENCODER
F
A
B
D
DRUM SHAFT
WD-05
WD-06
WA-35
SENSOR
MAST ANGLE
WA-21
PRESSURE TRANSDUCER
ACCESSORY
3
12
PRESSURE SWITCH
WB-36
ACCESSORY
3
2
WC-06
REAR DRUM
B
A
EDC
3
13
PUMP CONTROL
WD-25
REAR DRUM
MOTOR CONTROL
PCP
RD
WD-34
HS
24
REAR DRUM PAWL OUT
25
HS
REAR DRUM PAWL IN
WD-35
WC-32
HS
2
MAST LOWER
1
HS
MAST RAISE
WC-33
GANTRY RAISE
GANTRY LOWER
POWER
BOOM HINGE
PINS RETRACT
COUNTERWEIGHT
PINS DISENGAGED
BOOM HINGE
PINS ENGAGED
WB-28
WB-31
WB-32
WB-27
WB-30
PROGRAMMABLE
CONTROLLER
WB-06
WB-11
MAST LOWER
MAST RAISE
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 ...