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LAUNCH FRAME - UPPER WINCH ROPE TENSION INDICATOR
Up
TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
Next
LAUNCH FRAME - EMERGENCY WINCH DRUM RELEASE
TM 5-5420-279-23
a.
Remove
(1)
Make a note of the location and orientation of all components in the upper winch rope
tension indicator 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) that hold the tension arms (1) to the pivot shaft (10).
(5)
Carefully withdraw the pivot shaft (10) to free the pivot arm assembly (4) and tension arms
(1) from the base plate assembly (11).
(6)
Discard the two spring pins (3).
(7)
Examine all components for damage and corrosion.
(8)
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) do not rotate freely, remove the two setscrews (9)
from the pivot arm assembly (4).
(9)
Remove the roller (5), roller shaft (8), washers (7) and bearings (6).
(10)
If required, remove the cable (13) from the limit switch (15).
(11)
Remove the four screws, washers and nyloc nuts (14) securing the limit switch (15) to the
launch frame. Discard the nyloc nuts (14).
b.
Install
(1)
Fit the limit switch (15) to the launch frame and secure in place with the four screws,
washers and new nyloc nuts (14).
(2)
Fit the cable (13) to the limit switch (15).
(3)
Apply thread locking compound to the two setscrews (9).
(4)
Replace the two bearings (6) in the roller (5) and reassemble the roller shaft (8), roller (5),
washers (7) and bearings (6) to the pivot arm assembly (4) with the screws (9).
(5)
Pack the area between the exterior end faces of the bearings (6) and the inside faces of
the pivot arms (4) with grease.
(6)
Carefully feed the pivot shaft (10) through the pivot arm assembly (4), base plate assembly
(11) and both tension arms (1). Ensure the right hand tension arm (1) engages with the
limit switch (13).
(7)
Fit the two tension arms (1) to the pivot shaft (10) with two new spring pins (3). Align the
tension arms (4) to the pivot shaft (10) so the original four depressions in the pivot shaft
(10) align with the four screws (12).
(8)
Apply thread locking compound to the screws (12) and tighten.
(9)
With the roller (5) resting on the slack rope on top of the launch beam, ensure that the limit
switch (13) is closed. When tension is applied to the winch rope the limit switch (13) should
open.
(10)
Fit the two tension springs (2) to the tension arms (1).
(11)
Check the operation of the winch rope tension indicator in accordance with the operator's
manual TM 5-5420-279-10.
5-176

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