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Reference
Only
INTRODUCTION
999 SERVICE/MAINTENANCE MANUAL
1-48
Published 05-16-17, Control # 233-03
The free-flow check valve sections on side “A” of
counterbalance valves block fluid exhausting from piston
end of gantry cylinders.
F l u i d pa s s e s t h r o u g h f l o w r e s t r a i n s e c t i o n s o f
counterbalance valve that has a relief setting of 3,500 psi
(240 bar). Counterbalance valves operate with a 5:1 pilot
ratio of the relief valve pressure, permitting valve to open
when hydraulic pressure in rod end of the cylinders is
approximately 700 psi (48 bar). Exhaust fluid from side “A” of
counterbalance valves combines and free flow check valve
section on side “A” of load equalizing valve blocks the flow.
Hydraulic fluid then passes through flow restrain section of
valve that is preset at 4,000 psi (275 bar).
Load equalizing valve operates with a 1.5:1 pilot ratio of the
relief valve pressure. This permits valve to open when the
hydraulic pressure (from the setup pump) on side “B” of load
FIGURE 1-34
999CSM1-133
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
3
5
3
3
GANTRY
UP LIMIT
WB-22
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
4
GANTRY LOWER
3
HS
GANRTY 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
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 ...