Manitowoc 777 User Manual

Reference Only
Manitowoc Published 10-01-12, Control # 044-05 4-37
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
BOOM LADDER ASSEMBLY
Two ladders are installed inside the boom butt, one on either
side. The ladders are designed for use in assembly,
disassembly, and maintenance of #78 boom sections and
components. Each ladder weighs approximately 18 lb (8 kg).
Removal From Boom Butt
It is recommended that two people remove ladder from boom
butt: one person inside butt to unlatch and lift ladder and
another person outside of butt to help guide ladder out of
butt. Use the following procedure:
1. Lower boom onto blocking at ground level. Boom
sections must be horizontal.
2. Unhook rubber latches (Figure 4-22, View B).
3. Lift ladder up and out of hooks (Figure 4-25, View A).
4. Guide ladder through lacings to outside of boom butt.
Installation on Boom Inserts
Lift ladder to desired outside location on insert so that upper
pads are securely hooked over backside of upper chord and
lower pads rest firmly against lower chord (Figure 4-23).
Ladder must hang vertically against boom insert when in
use.
Storage in Boom Butt
It is recommended that two people store ladder in boom butt:
one person outside of butt to help guide ladder into butt, and
another person inside butt to lift ladder and latch it in
position. Use the following procedure:
1. Hang ladder rails over hooks inside butt (Figure 4-22,
View A).
2. Pull rubber latches tightly over lower rail and latch in
keepers (Figure 4-22, View B).
3. Ensure ladder cannot move once latched in place.
WARNING
To Prevent Serious Injury or Death:
• Limit load on ladder to 300 lb (136 kg).
• Avoid improper use. Use this ladder only on
Manitowoc #78 boom inserts. Do not use on any other
boom.
• Use ladder for boom assembly, disassembly, and
maintenance only when boom is horizontal and
securely blocked on ground. Do not use ladder on
tapered inserts.
• Make sure ladder is properly secured to insert.
• When climbing ladder, hands shall be free of any
objects. Objects which cannot be carried in pockets or
tool belts shall be lifted in place on ladder platform
prior to climbing ladder.
• Stand on platform only. Do not stand on cross braces.
WARNING
Falling Load Hazard!
Ladders must be properly stored to prevent them from
falling out of butt when boom is raised.
FIGURE 4-23
A1023
Pad
Upper
Chord
Lower
Chord
Pad
Pad
(4 Places)
Ladder
Ladder
Boom
Insert
Ladder

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English