Reference
Only
INTRODUCTION
999 SERVICE/MAINTENANCE MANUAL
1-28
Published 05-16-17, Control # 233-03
Load Drum Lowering
See Figures
and
When the front drum handle (1) is moved forward to lower,
handle neutral switch closes, sending an input voltage of 5
volts or less to PC. The PC sends a negative output voltage
to load drum system pump EDC (12) and motor PCP (13).
The PC sends a positive output signal to stroke the front
drum pump momentarily in the up direction to satisfy
pressure memory. The PC compares front drum holding
pressure to value stored in pressure memory. When system
pressure is high enough, the PC sends a positive output
signal to enable brake release solenoid HS-16. Front drum
brake release solenoid HS-16 shifts, to block tank port and
open port from low-pressure side of closed-loop to brake
cylinder spring, releasing brake.
The PC sends a negative output signal to enable front drum
pump EDC that tilts pump swashplate to stroke pump in the
down direction. Hydraulic fluid flows from front drum pump
port B to port B of front drum motor. Fluid from motor port A,
returns to load drum pump port A.
FIGURE 1-18
HS-20 or HS-25
.06
X
X
6 GPM
B
A
B
A
SERVO PRESSURE
CHARGE PUMP
LOW PRESSURE SIDE
HIGH PRESSURE SIDE
350 PSI
(24 BAR
)
HS-16
FRONT OR REAR
LOW PRESSURE
BRAKE
PAWL
SUPERCHARGE
MANIFOLD
CHARGE
PUMP
FROM TRAVEL
PILOT
FRONT OR REAR LOAD DRUM PUMP
999CSM1-117
3
5
3
6
3
6
3
3
REAR
DRUM
ONLY
REAR DRUM ONLY
TO UPPER
ACCESSORY VALVE
or
HS-21
3
7
LOAD DRUM
3
4
HS-19 or HS-24
REAR DRUM TO
ACCESSORIES
LOW PRESSURE
Содержание 999
Страница 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Страница 2: ...R e f e r e n c e O n l y ...
Страница 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Страница 173: ...R e f e r e n c e O n l y Manitowoc Published 05 16 17 Control 233 03 4 19 999 SERVICE MAINTENANCE MANUAL BOOM 4 ...
Страница 174: ...R e f e r e n c e O n l y BOOM 999 SERVICE MAINTENANCE MANUAL 4 20 Published 05 16 17 Control 233 03 ...
Страница 297: ...R e f e r e n c e O n l y ...
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