S 224-018

 (3)  
Do a check on the torque tube for permitted wear (Ref 27-21-71/601).

 F.
Install the Torque Tube (Fig. 401)

 S 434-019
 (1)  Put the torque tube through the structural cutouts and the upper bearing housing, upper crank, and center crank.
 NOTE: Make sure that both the upper and lower bearings are
____
 in the correct positions.

 S 434-020
 (2)  
Put the lower bearing housing on the torque tube and connect it to the structure with bolts, washers, and nuts.

 S 434-021

 (3)  
Attach the upper bearing housing to the structure with the washers and bolts.

 S 434-022

 (4)  
Install a lockwire on the bolt heads.

 S 434-023

 (5)  
Put the lower crank on the torque tube.

 S 624-024

 (6)  
Apply corrosion preventive compound to the lower crank bolts.

 S 434-033

 (7)  
Attach the lower crank to the torque tube with the bolts, washers, and nuts.

 (a)  
Tighten the nuts for the lower crank to 12-15 pound-inches.

 (8)
Apply corrosion preventive compound to the center crank bolts.

 S 434-025

 (9)  
Attach the center crank to the torque tube with the bolts, washers, and nut.

 (a)  
Tighten the nuts for the center crank to 25-35 pound-inches.

 S 624-025
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-71
 ALL  ú ú 01 Page 405 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 624-026
 (10)
 Apply corrosion preventive compound to the upper crank bolts.

 S 434-026

 (11)
 Attach the upper crank to the torque tube with the bolts, washers, and nuts.

 (a)  
Tighten the nuts for the upper crank to 25-35 pound-inches.

 S 214-027
 (12)
 To ensure that installation of the torque tube assembly is satisfactory, do these steps:

 (a)  
Make sure that the torque tube turns freely without roughness.

 (b)  
Make sure that there is no radial movement of the torque tube at the two bearings.

 (c)  
Make sure that vertical movement of the torque tube does not exceed 0.020 inch.

 (d)  
If the torque tube does not turn freely or if vertical movement of the torque tube is more than 0.020 inch, examine the upper and lower bearing housing installations.

 S 434-028
 (13)
 Attach the standby input rod and the aft quadrant control rod to their cranks with the bolts, washers, and nuts.

 S 434-027

 (14)
 Attach the trim and feel rod to the lower crank with the bolts, washers, and nuts.

 (a)  
Tighten the large nut to 50-60 pound-inches.

 CAUTION: DO NOT TIGHTEN THE LARGE NUT AFTER YOU TIGHTEN THE SMALL
_______ NUT. MOVEMENT OF THE LARGE NUT CAN CAUSE THE SMALL NUT TO COME LOOSE.
 (b)  Tighten the small nut to 12-15 pound-inches.
 S 434-030
 (15)
 Attach the vernier control rod to the center crank with the bolts, washers, and nuts.

 (a)  
Tighten the large nut to 50-65 pound-inches.

 CAUTION: DO NOT TIGHTEN THE LARGE NUT AFTER YOU TIGHTEN THE SMALL
_______ NUT. MOVEMENT OF THE LARGE NUT CAN CAUSE THE SMALL NUT TO COME LOOSE.
 (b)  Tighten the small nut to 12-15 pound-inches.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-71
 ALL  ú ú 01 Page 406 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ú ú ú  S 644-031 (16) Apply grease to the top of both the upper and lower torque tube bearings. (a) Fill the upper and lower bearing housings until the grease is aligned with the surrounding structure.S 644-035(17) Fillet seal the upper crank and center crank with sealant BMS 5-95.
 S 864-031 (18) Supply hydraulic power to the rudder system (Ref 27-21-00/201).
　
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