TM 9-2320-260-43-2
16-19. INNER BOOM MAINTENANCE (M816) (Contd)
All personnel must stand clear during lifting operations. A
swinging or shifting load may cause injury or death to personnel.
q Inner boom must be supported during installation to prevent
unbalancing of boom. Failure to do so may cause injury to
personnel.
q Ensure lifting capacity is greater than weight (700 lb (318 kg))
of inner boom. Failure to do so may result in injury to personnel
or damage to equipment.
NOTE
q Two assistants will help with installation.
q It may be necessary to loosen adjustments of upper boom roller,
lower boom roller, and inner boom roller to ease in installation of
inner boom.
Install chain sling, spreader bar, and lifting device on inner boom (2).
1.
Raise inner boom (2) and insert boom (1).
2.
Direct assistant to adjust lifting sling while another guides inner boom (2) into boom (1) until inner
3.
boom (2) contacts leg of chain sling.
Place jacks under inner boom (2).
4.
Remove chain sling, spreader bar, and lifiing device from inner boom (2).
5.
Install chain sling and lifting device on end of inner boom (2).
6.
Continue to install inner boom (2) in boom (1).
7.
Aline trunnion (4) of extension cylinder (3) with brackets (6) of boom (1) and install with pin (5) and
8.
new cotter pin (7).
Install two stop plates (12) on boom (1) with eight new Iockwashers (13) and screws (14).
9.
Place inner boom roller (15) on shaft (16) and install in boom (1).
10.
Install cover (10) on boom (1) with four new lockwashers (9) and screws (8).
11,
Install new cotter pin (17) and two grease fittings (11) on shaft (16).
12.
13.
Remove lifting device and chain from inner boom (2).
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