Reference
Only
Manitowoc
Published 05-16-17, Control # 233-03
1-37
999 SERVICE/MAINTENANCE MANUAL
INTRODUCTION
1
AUXILIARY DRUM SYSTEM (OPTIONAL)
See Figures
The auxiliary drum is located in boom butt and is operated
with auxiliary drum handle (1) in operator's cab. The auxiliary
drum system is similar to other load drums. Auxiliary drum
pump is mounted on the engine driven pump drive. Unlike
other system pumps, EDC valve (2) operates with positive
current only rather than reversing polarity to control auxiliary
pump displacement.
Hydraulic connection between auxiliary drum pump (3) and
auxiliary drum motor (4) forms a closed-loop system. Make-
up fluid from auxiliary drum charge pump (5) replaces fluid in
the system that is displaced by internal leakage of the pump
and motor.
When auxiliary drum handle is in neutral position, the PC
receives no voltage from control handle, and the PC opens
the circuits to auxiliary drum pump EDC (2), motor PCP (6),
and brake release solenoid HS-26. Because these circuits
are open, auxiliary drum pump does not stroke, auxiliary
drum motor remains at low speed, and auxiliary drum brake
(7) remains spring-applied to prevent the auxiliary drum from
turning.
When auxiliary drum rotates, speed encoder (8) sends an
input signal to the PC. The PC sends an output signal that
enables rotation indicator (9) in auxiliary drum handle.
Rotation indicator on top of control handle pulsates with a
varying frequency that indicates rotational speed of load
drum. As drum rotates faster, the indicator pulsates faster.
A pressure sender (10) in high-pressure side of auxiliary
drum closed-loop system provides system pressure
information to the PC.
FIGURE 1-26
WA-01
8D
8
WB-10
WB-09
SELECT
CONFIRM
CRANE MODE
8T
0
0
8
WB-26
WB-33
DOWN SCROLL
UP SCROLL
WA-27
K1
F4
F8
PRESSURE TRANSDUCER
AUXILIARY DRUM
SYSTEM FAULT
BUZZER
25A
25
OPERATING LIMIT
BEEPER
5A
5A
+
_
ENGINE
10A
5D
5A
F15
STOP
STOP
3
RUN
START
7
MS1
K1
5DA
8
8P1
50 AMP
CB7
SEAT SWITCH
WB-34
999CSM1-126
F12
3A
REGULATED 10V DC OUTPUT
RAISE
OFF
LOWER
AUXILIARY HANDLE
WA-09
WD-18
WD-19
DIGITAL DISPLAY
HS
26
AUXILIARY DRUM
3
9
3
1
WE-37
AUXILIARY DRUM
B
A
WC-08
HS
28
AUX. DRUM PAWL OUT
WD-12
WC-25
3
2
3
6
3
14
3
12
BLOCK UP LIMITS
RIN
WE-30
AUX
PCP
AUX. DRUM
MOTOR CONTROL
PUMP CONTROL
WD-30
ROTATION INDICATOR
AUXILIARY DRUM
27
HS
AUX. DRUM PAWL IN
WC-07
DRUM BRAKE
AUX. DRUM
SPEED
ENCODER
F
A
B
D
FLANGE
PROGRAMMABLE
CONTROLLER
WE-01
WE-02
3
10
AUX
EDC
UP
DOWN
C
D
WE-36
3
8
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 ...