23-32-09
 ú ú 01 Page 404 ú Jun 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 COUNTER BALANCE UNIT - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes a counter balance unit. The second task installs the counter balance unit and does a test of the installation.
 B.  The retractor assembly has two counter balance units with complementary construction, one for the right and one for the left. A tab with one bolt attaches each unit to the retractor assembly frame. A tube between the two units gives support for a rigid construction.
 TASK 23-32-11-024-002
 2.  Counter Balance Unit Removal____________________________(Fig. 401)
 A.  References
 (1)  AMM 23-32-01/401, Retractable Video Monitor
 B.  Access
 (1)  Location Zones 221/222 Passenger Cabin - section 41 223/224 Area above ceiling, Passenger Cabin - section 41
 C.  GUN 051,101-103;
 Procedure

 S 024-003
 (1)  Remove the retractable video monitor (AMM 23-32-01/401).
 S 024-004
 CAUTION: DO NOT LET THE CABLE WIND INTO THE COUNTER BALNCE UNIT.
_______ THIS INSTALLATION HAS NOTHING TO RETAIN THE DISCONNECTED CABLE. IF THE CABLE WINDS INTO THE COUNTER BALANCE UNIT, THE UNIT BECOMES UNSERVICEABLE.
 (2)  Carefully disconnect the cable from the cable attachment on the support frame:
 (a)  
Use an applicable retention device on the cable to make sure the disconnected cable does not wind into the counter balance unit.

 (b)  
Disconnect the cable from the cable attachment on the support frame.

 S 024-005
 (3)  Remove the rod from the center of the unserviceable counter balance unit:
 (a)  Remove and discard the applicable cotter pin from the tube which connects the center rods of the two counter balance units.
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 23-32-11
 ú ú 04 Page 401 ú Sep 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

COUNTER BALANCE UNIT

Counter Balance Unit Installation
Figure 401 (Sheet 1)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 GUN 051,101-103 ú 23-32-11
 ú ú 04 Page 402 ú Mar 20/94
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757
MAINTENANCE MANUAL

COUNTER BALANCE UNIT

Counter Balance Unit Installation
Figure 401 (Sheet 2)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 GUN 008-010,104-999 ú 23-32-11
 ú ú 04 Page 403 ú Mar 20/94
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E05247
A

757 MAINTENANCE MANUAL
 (b)  Remove the rod from the center of the counter balance unit, and keep it for the installation.
 S 024-006
 (4)  
Remove the bolt, washer, and nut from the attachment tab on the counter balance unit, and keep the hardware for the installation.

 S 024-007

 (5)  
Remove the counter balance unit.

 D.  GUN 008-010,104-999;
 Procedure

 S 024-015
 (1)  
Remove the retractable video monitor (AMM 23-32-01/401).

 S 024-020

 (2)  
Carefully disconnect the cable from the cable attachment on the support frame.

 S 024-017

 (3)  
Remove the rod from the center of the unserviceable counter balance unit:

 (a)  
Remove and discard the applicable cotter pin from the tube which connects the center rods of the two counter balance units.

 (b)  
Remove the rod from the center of the counter balance unit, and keep it for the installation.
　
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