32-34-00
 ALL  ú ú 01 Page 4 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
RETURN SPRING
QUADRANT ASSEMBLY
MANUAL EXTENSION CRANK CABLE MLGEA
CAM  QUADRANT ASSEMBLY 
SHAFT 
ARM 
CAM  UPLOCK RELEASE ROD 

ROLLER
UPLOCK SPRING
UNLOCK ROLLER
CRANK (ON MAIN LANDING GEAR)
UNLOCK STOP LINKS LINK
UPLOCK HOOK
UPLOCK MECHANISM (UP AND LOCKED)
B
RETURN SPRING MANUAL EXTENSION CABLE MLGEA CAM SHAFT
ARM QUADRANT ASSEMBLY
CAM UPLOCK RELEASE ROD
ROLLER
UNLOCK
CRANK
STOP LINK
UPLOCK HOOK
UPLOCK LINKS
ROLLER SPRING
UPLOCK (ON MAIN LANDING GEAR)
UPLOCK MECHANISM (RELEASED)
B
Main Gear Manual Extension Control Figure 2 (Sheet 2)
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 32-34-00
 ALL  ú ú 01 Page 5 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MAIN GEAR MANUAL EXTENSION SYSTEM - TROUBLE SHOOTING
____________________________________________________
 1.  General
_______
 A.  In trouble shooting the main gear manual extension system, the trouble symptoms are best identified by performing a test of manually extending the gear (Ref 32-34-00, A/T).
 B.  The system is functionally tested with hydraulic system A depressurized and landing gear control lever in the OFF position.
 C.  Two men are required, one stationed in the control cabin to operate the left and right main gear manual extension handles and one stationed near the gears to observe gear action.
 D.  Main gear manual extension system must be adjusted properly prior to trouble shooting (Ref 32-34-00, A/T).
 2.  Prepare for Trouble Shooting
____________________________
 A.  Jack airplane until all tires clear ground (Ref Chapter 7, Jacking).
 B.  Open manual extension access doors in control cabin floor and attach spring scale to manual extension handles of gear being tested.
 C.  Connect external electrical power supply.
 D.  Pressurize hydraulic system A (Ref 29-15-00, MP).
 E.  Remove main gear ground lock assemblies (Ref 32-00-01).
 F.  Check that all circuit breakers on landing gear circuit breaker panel P6 are closed.
 WARNING: PERSONNEL KEEP CLEAR OF GEAR PATHS TO PRECLUDE POSSIBLE INJURY TO
_______
 PERSONNEL.

 G.  Move landing gear control lever to UP to retract main gear, then move control lever to OFF position.
 H.  Depressurize hydraulic system A (Ref 29-15-00, MP) and proceed trouble shooting with pressure off.
 I.  Following trouble shooting, restore airplane to normal.
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 32-34-00
 ALL  ú ú 01 Page 101 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
3.  Trouble Shooting Charts_______________________

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 32-34-00
 ALL  ú ú 01 Page 102 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MAIN GEAR MANUAL EXTENSION SYSTEM - ADJUSTMENT/TEST
___________________________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)  
An adjustment of the manual extension system of the main landing gear.

 (2)
A test of the manual extension system of the main landing gear. B. This procedure adjusts (rigs) the left or right manual extension system for the main landing gears. It is to get the cable tensions and the clearances between the components for the correct system operation.
　
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