52-31-12
 ALL  ú ú B02 Page 402 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WARNING: ALWAYS USE THE RED DOOR SUPPORT BRACE TO KEEP THE DOOR IN
_______ THE OPEN POSITION. IF YOU DO NOT USE THE RED DOOR SUPPORT BRACE YOU CAN CAUSE INJURY TO PERSONS NEAR THE DOOR.
 (b)  Open the door and install the door support brace to keep the door in the open position.
 S 434-060-B00
 (2)  
Attach the balance mechanism cable to the counterbalance assembly.

 (a)  
Make sure one end of the balance mechanism cable is attached to the floor beam.

 (b)  
Make sure the cable has the correct routing from the floor beam to the counterbalance assembly.

 (c)  
Find the notch on the drum.

 (d)  
Install the cable retaining plate and screw to attach the other end of the cable to the drum.

 S 024-057-B00
 (3)  
Attach the counterbalance assembly to the door with the five counterbalance attach bolts.

 S 214-048-B00

 (4)  
Examine the condition of the cable assembly.

 CAUTION: DO NOT CLEAN THE CABLE BY SOLVENT DEGREASING OR WITH A
_______ SOLVENT WETTED CLOTH. IF YOU USE SOLVENT, YOU CAN CAUSE CORROSION AND DAMAGE TO THE CABLE.
 (a)  
If the cable assembly becomes dirty with unwanted material (debris due to machining operations) during or after the installation, clean the area with a clean dry cloth.

 (b)  
Make sure the balance cable is loose.

 WARNING: MAKE SURE THERE IS NO TENSION ON THE BALANCE CABLE WHEN
_______ YOU REMOVE THE SUPPORT BRACE. IF THE COUNTERBALANCE SPRING IS NOT HELD BY THE NUT, THE CABLE CAN CAUSE INJURY WHEN IT ACCIDENTALLY RETRACTS.
 (c)  
Remove the door support brace to let the door close.

 (5)  
Do the task to adjust the balance mechanism.

 S 824-045-B00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (6)  S 424-064-B00Install the sleeve and the screw on the guide pin.
 NOTE:____ Not all guide pins have sleeves and screws.
 (7)  S 444-046-B00Install the insulation pad and the lining retainer studs.
 (8)  S 214-047-B00Examine the balance mechanism for correct operation.
 NOTE:____ When the door is released, the door must move smoothly in the upward direction to or near the up-latched position.

 TASK 52-31-12-824-059-B00
 4. Balance Mechanism Adjustment (Fig. 402)##
____________________________
 A. Standard Tools and Equipment
 (1)  
Nut - BACN10YRCD (3/8, Self-Locking)

 (2)  
Washer - AN960C616 (optional)

 (3)  
A spring scale that can measure 0 to 50 pounds.

 B.
Access

 (1)  
Location Zones
 209 Forward Cargo Door
 219 Aft Cargo Door

 C.
Procedure

 S 844-061-B00
 (1)  
Prepare to adjust the balance mechanism.

 (a)  
Make sure there is a nut and washer on the counterbalance shaft against the adjustment fitting to hold the spring and stop counterbalance operation (Fig. 401, detail A).

 (b)  
Make sure the cable is loose.

 (c)  
Put the door in the closed position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-31-12
 ALL  ú ú B13 Page 404 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 824-052-B00
 (2)  Do these two steps to align the cable:
 (a) Turn the cable alignment screw in the cable sheave to move the
 sheave forward or aft to align the cable correctly (Fig. 402,
 detail A).
 (b) Move the cable adjustment fitting to make the cable the correct
　
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