TM 5-5420-280-23&P
0100 00
SECONDARY BOOM REPLACEMENT (Contd)
WARNING
Secondary boom is heavy and must be supported during removal
or installation. Failure to comply may result in injury or death
to personnel.
REMOVAL
1.
Support cylinder (10) and remove two snaprings (7) and pin (8) from secondary boom brackets (6)
and lower front of cylinder (10).
NOTE
Mark position of limit switch in two places prior to removal.
2.
Remove four locknuts (20), washers (19), screws (15), and limit switch (16) from bracket (17) on
boom support bearing (1). Discard locknuts (20).
3.
Remove four locknuts (13), washers (14), screws (2), and two boom support bearings (1) with support
boom (5) from two pallet support brackets (11) on pallet (12). Discard locknuts (13).
4.
Slide two boom support bearings (1) off secondary boom shafts (4).
5.
If damaged, remove bushings (3) from two boom support bearings (1).
INSTALLATION
NOTE
Apply a light coat of grease to bushings and pins at installation.
1.
If removed, install bushings (3) on two boom support bearings (1).
2.
Slide two boom support bearings (1) on secondary boom shafts (4).
3.
Align tabs (18) with slots (9) on two pallet support brackets (11) and install two boom support
bearings (1) with support boom (5) on pallet (12) with four screws (2), washers (14), and new
locknuts (13).
4.
Swing cylinder (10) up and install pin (8) on secondary boom brackets (6) and cylinder (10) with two
snaprings (7).
NOTE
Ensure limit switch is installed as marked.
5.
Install limit switch (16) on bracket (17) on boom support bearing (1) with four screws (15), washers
(19), and new locknuts (20).
6.
Install bridge halves on bridge pallet. Refer to WP 0018 00.
2
1
3
5
20
4
19
18 17
15
16
14
12
13
11
4
6
8
7
9
10
END OF WORK PACKAGE
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