TM 5-5420-280-23&P
0090 00
UPPER ROLLER BLOCK ASSEMBLY REPLACEMENT (Contd)
NOTE
Removal and installation of upper roller block assemblies are
performed the same way. Right side is shown.
REMOVAL
1.
Start Launch Power Unit (LPU) or CBT, remove retaining pin from launch boom (12) and depress
KY1 and KY18 control valves simultaneously to lower launch boom (12) to 0-degrees position.
Release control valves and shut down LPU.
2.
Remove four screws (10), lockwashers (9), two retaining plates (8), pins (11), and roller block
assemblies (7) from launch boom brackets (14) on launch boom (12). Discard lockwashers (9).
NOTE
Inner bearing hub is welded to roller block housing. If bearing hubs
are damaged, install a new upper roller block assembly.
3.
Remove twelve screws (6), four covers (5), and outer roller bearings (4) from inner bearing hubs (3)
on two roller block housings (1).
4.
Remove four lube fittings (2) from inner bearing hubs (3).
5.
If worn or damaged, remove two bushings (13) from launch boom brackets (14).
INSTALLATION
NOTE
Apply a light coat of grease to all parts at installation.
1.
If removed, install two bushings (13) on launch boom brackets (14).
2.
Install four outer roller bearings (4) on inner bearing hubs (3) with four covers (5) and twelve
screws (6).
3.
Install four lube fittings (2) on inner bearing hubs (3) and grease outer roller bearings (4).
4.
Install two roller block assemblies (7) on launch boom brackets (14) with two pins (11), retaining
plates (8), four new lockwashers (9), and screws (10).
5.
Start LPU or CBT and depress KY1 and KY19 control valves simultaneously to raise launch
boom (12) to +90-degrees position. Install retaining pin on launch boom (12).
0090 00-2
