Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 1-57
999 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Low-pressure side hydraulic fluid flows to boom hinge pins
engage solenoid HS-5 of accessory valve. Hydraulic fluid
leaves the accessory valve and enters piston end of boom
pin cylinder (6), extending cylinder rod to engage the boom
hinge pins. Exhaust fluid from rod end of boom pin cylinder
leaves accessory system valve and returns to tank.
When power button is pressed and boom hinge pins switch
is placed in disengage position and held the PC sends a
positive output signal to boom hinge pins disengage solenoid
HS-6. When HS-6 is enabled, the PC sends a negative
output voltage to rear drum pump EDC (13) that tilts rear
drum pump swashplate to stroke pump in the low-pressure
side direction.
Low-pressure side hydraulic fluid flows to boom hinge pins
disengage solenoid HS-6 of accessory valve. Hydraulic fluid
leaves the accessory valve and enters rod end of boom pin
cylinder (6), retracting cylinder rod to disengage the hinge
pins. Exhaust fluid from piston end of boom pin cylinder
leaves accessory system valve and returns to tank.
FIGURE 1-41
HIGH
UPPERWORKS ACCESSORY MANIFOLD
REAR DRUM
PUMP DRIVE GEARBOX
HS-4
A
A
A
BB
B
BOOM HINGE
PIN
CYLINDER
LOAD EQUALIZING
VALVE
4,000 PSI (275 BAR)
MAST RAISING CYLINDERS
3,500 PSI (240 BAR)
LOW
999CSM1-140
HS-3
HS-2
HS-1
HS-6
HS-5
A
A
A
BB
B
LOAD EQUALIZING
VALVE
4,000 PSI (275 BAR)
GANTRY CYLINDERS
3,500 PSI (240 BAR)
HIGH
FRONT DRUM
PUMP DRIVE GEARBOX
LOW
LOW PRESSURE
ACCESSORIES
3
6
TO LOWERWORKS
ACCESSORY MANIFOLD
TO REAR HOIST MOTOR
LOOP FLUSHING VALVE
3
14
3
14

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English