b.
Position the extension boom into the end of main boom squarely and slide extension boom in.
c.
Line cylinder bracket on extension boom (4) with cylinder rod end and install cylinder pin (18) and cotter pins
(17).
d.
Assemble cups (16) in sheave (14) and install bearings (15).
e.
While holding the bearings (15) in place, insert the sheave (14) into the end of manual extension boom (3). Aline
holes and install pin (12) and nut (11). Make sure grease fitting (13) is installed in pin.
f.
Install screw (9), spacer (10), nut (8), screw (6), spacer (7) and nut (5) in manual extension boom (3).
g.
Slide manual extension boom (3) into extension boom (4), aline holes and install extension pin (2) and clinch pin
(1).
5-7.4 Main Boom Assembly. (Figure 5-10)
5-7.4.1 Removal and Disassembly.
a.
Refer to paragraph 5-7.3 and remove the extension boom assembly.
b.
Remove screws (6), and wear pads (7) from retainers (2), and screws (8) and wear pad (9) from trunnion (5).
c.
Disconnect and cap the hydraulic lines to the extension cylinder (12), then remove cotter pins (10), pin (11) and
cylinder (12) from main boom (13). Refer to paragraph 5-7.5 for repair of cylinder.
d.
Attach a supporting sling to the main boom (1 3).
e.
Support the main cylinder (16) and remove nut (14) and pin (15). Carefully lower the rod end of cylinder.
f.
Disconnect and cap hydraulic lines to main cylinder (16). Remove nut (17), pin (18) and cylinder (16). Remove
bushings (19 and 20) and, if replacement is required, grease fittings (21). Refer to paragraph 5-7.6 for repair of
cylinder.
g.
Remove nut (22) and drive out pin (23). Lift the main boom (1 3) out of the turret. Remove bushings (24).
h.
As needed, remove screws (25), indicator (26), nuts (27), washers (28), rod (29), roller (30), bars (31) and grease
fittings (32).
i.
Replace parts as required.
5-7.3.2 Assembly and Installation.
a.
Attach a lifting sling to main boom (13). Install bushings (24) and grease fittings (32).
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