TM 5-5420-280-23&P
0088 00
LOWER SUPPORT ROLLER ASSEMBLY REPLACEMENT (Contd)
REMOVAL
WARNING
Launch boom must be supported during removal and installation.
Failure to comply may result in injury or death to personnel.
1.
Start Launch Power Unit (LPU), remove retaining pins on launch boom and depress KY1 and KY18
control valves simultaneously to lower launch boom (11) to 0-degrees position. Release control
valves and shut down LPU.
CAUTION
Cap or plug all hoses, connections, and openings immediately after
disconnection to prevent contamination. Remove caps or plugs prior
to installation. Failure to do so may result in damage to equipment.
NOTE
Tag hoses for installation.
Have container ready to catch oil.
2.
Loosen nuts (5) and (7) and disconnect hoses (4) and (8) from adapter (3) and elbow (6) on stop
cylinder (1).
3.
Disconnect two hoses (10) from pin wheel drive hydraulic motor (9).
4.
Attach lifting device and chain or sling to boom roller track assembly (2) and take up slack.
5.
Remove four screws (16), lockwashers (15), and two retainer plates (17) from over tab (18) on
pins (14) and launch boom brackets (19). Discard lockwashers (5).
6.
Support boom roller track assembly (2) and remove two pins (14), boom roller track assembly (2),
and spacers (13) from launch boom (11) and two bushings (12).
7.
If worn or damaged, remove two bushings (12) from roller track frame (20).
2
9
2
1
10
6
10
3
7
11
8
5
4
0088 00-2
