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LAUNCH FRAME - LOWER WINCH ROPE TENSIONER
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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LAUNCH FRAME - UPPER WINCH ROPE TENSIONER
TM 5-5420-279-23
a.
Remove
(1)
Make a note of the location and orientation of all components in the lower winch rope
tensioner assembly.
(2)
Disconnect the two tension springs (2) from the tension arms (1).
(3)
Remove the four screws (12) that secure the pivot arm assembly (4) to the pivot shaft (10).
(4)
Remove the two spring pins (3) and the grub screw (13) from the left hand tension arm,
that hold the tension arms (1) to the pivot shaft (10).
(5)
Ensure there are no burrs around any of the holes in the pivot shaft (10) that could damage
the bushings in the base plate (11).
(6)
Carefully withdraw the pivot shaft (10) from the lugs of the base plate (11) to free the pivot
arm assembly (4) and tension arms (1).
(7)
Discard the two spring pins (3).
(8)
Examine all components for damage and corrosion.
(9)
Check for free rotation of the roller (5) on the pivot arm assembly (4). If the roller (5) does
not rotate freely and the bearings (6) are not rotating freely, remove the two setscrews (9)
from the pivot arm assembly (4).
(10)
Remove the roller (5), roller shaft (7), washers (8) and bearings (6).
b.
Install
(1)
Apply thread locking compound to the two setscrews (9).
(2)
Replace the two bearings (6) in the roller (5) and reassemble the roller shaft (7), roller (5),
washers (8), and bearings (6) to the pivot arm assembly (4) with the setscrews (9).
(3)
Pack the area between the exterior end faces of the bearings (6) and the inside faces of
the pivot arms (4) with grease.
(4)
Carefully feed the pivot shaft (10) through the pivot arm assembly (4), base plates (11) and
both tension arms (1).
(5)
Fit the two tension arms (1) to the pivot shaft (10) with two new spring pins (3) and the grub
screw (13).
(6)
Apply thread locking compound to the screws (12).
(7)
Ensure the tension arms (1) are fitted to the pivot shaft (10) so the depressions in the pivot
shaft (10) align with the four pivot arm assembly screws (12).
(8)
Fit the screws (12) and tighten.
(9)
Fit the two tension springs (2) to the tension arms (1).
5-172

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