Manitowoc Published 12-05-17, Control # 032-23 3-41
18000 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Load Drum Operation
See Figure 3-10 for drum identification.
See Figure 3-21
for the following description of operation.
.
1. Select and confirm desired crane mode.
2. Depending on mode selected, load drums are controlled
by handles B, C or D. See handle display light to
determine what load drum is controlled by what handle.
3. Turn off drum park for drum to be operated.
4. Increase engine speed to desired RPM with hand
throttle. Depress foot throttle to momentarily increase
engine speed when more power is required.
5. Pull load control handle B, C or D (Drum 1, Drum 2, or
Drum 3) BACK from off to RAISE load or push load
control handle FORWARD from off to LOWER load.
NOTE: Excessive speed will cause drum spooling
backlash with reduced rope tension as a result of:
• Boom and luffing jib at high angles
• Wind loading from front
• Light load blocks
6. As load nears desired position, slowly move load control
handle toward off to slow down load. Then release
handle to off to stop load and hold it in position (drum
park brake will apply).
WARNING
Falling Load Hazard!
Prevent load on unused drums from falling. Turn on drum
park for drums not in use.
FIGURE 3-21
Lower
Load
Typical All
Load Drums
OFF
Raise
Load
Handle D
Handle B
Handle C
3-119
3-104a
CAUTION
Boom Damage!
Do not turn on load drum park while raising or lowering
load. Brake will bring load to an abrupt stop. This action
could cause shock load damage to boom and load line.
Bring load to a smooth stop with control handle and then
turn on drum park.
CAUTION
Drum Spooling Backlash!
Lowering/hoisting with reduced rope tension (slack) will
cause drum spooling backlash, improper spooling of wire
rope on the drum, and possible pull through. The crane
operator shall maintain proper rope tension while
lowering/hoisting load blocks, booms, and luffing jibs.
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