Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 1-25
999 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
When boom hoist handle is moved to neutral position, the
PC sends an output signal to boom hoist pump EDC to
decrease swashplate angle, reducing flow output. The PC
also shifts the motor back to maximum displacement for
slower output speed to slow the drum rotation. The PC shifts
the pump swashplate through neutral until the EDC has a
slightly positive signal. This shifts the swashplate in the
positive direction and builds pressure on high-pressure side
of closed-loop. The PC stores load-holding pressure in
pressure memory. After control handle neutral switch opens,
the PC sends an output signal to disable brake release
solenoid HS-13 to spring-apply brake before boom hoist
pump de-strokes.
FIGURE 1-16
HS-14
.06
X
X
6 GPM
B
A
A
B
SERVO PRESSURE
CHARGE PUMP
LOW PRESSURE SIDE
HIGH PRESSURE SIDE
350 PSI
(24 BAR
)
HS-13
BOOM HOIST
DRUM
LOW PRESSURE
HS-15
BRAKE
PAWL
SUPERCHARGE
MANIFOLD
CHARGE
PUMP
FROM TRAVEL
PILOT
BOOM
HOIST
BOOM HOIST PUMP
999CSM1-115
3
5
3
9
3
6
3
2
3
4
3
13
3
10

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English