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A 737-300/400/500MAINTENANCE MANUAL
 (b) (c)  Use the override trigger.Move the landing gear lever from the DN position to the UP position and move back three times.
 NOTE:____ Hold the landing gear lever in each position for three seconds before you move the lever to the subsequent position.
 (d) (e) (f) (g) (h)  Move the landing gear lever to the DN position.Make sure the rod end of the uplock actuator tries to retract when you move the landing gear lever from the DN position to the OFF position.Move the landing gear lever to the DN position.Make sure there is no leaks in the hydraulic connections.Decrease the pressure from the hydraulic system A (AMM 29-15-00/201).

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A
737-300/400/500MAINTENANCE MANUAL
 MAIN GEAR DOWNLOCK ACTUATOR - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task gives instructions to remove the Main Gear Downlock Actuator. The second task gives instructions to install the Main Gear Downlock Actuator.
 TASK 32-32-51-004-004
 2.  Main Gear Downlock Actuator - Removal (Fig. 401)_____________________________________
 A.  References
 (1)  
Hydraulic Systems A, B, and Standby (AMM 29-15-00/201)

 (2)  
Ground Lock Assemblies (AMM 32-00-01/201)

 (3)  
Main Gear Extension and Retraction (AMM 32-32-00/501)

 (4)  
Main Gear Downlock Spring Assembly (AMM 32-32-91/401)

 B.  
Equipment

 (1)  
Ground Lock Assemblies - F72735

 C.  
Procedure

 S 864-001
 (1)  
Make sure the ground lock assemblies for the landing gear are installed (AMM 32-00-01/201).

 S 864-002

 (2)  
Decrease the pressure from the hydraulic system (AMM 29-15-00/201).

 S 864-011

 (3)  
Put a tag on the hydraulic lines to show their position.

 S 024-010

 (4)
Disconnect the hydraulic lines from the downlock actuator.

 NOTE: Put a plug on the hydraulic lines.
____
 S 034-012
 (5)  
Remove the downlock springs (AMM 32-32-91/401).

 S 024-013

 (6)  
Remove the outboard actuator bolt, washer and nut and remove actuator from airplane.

 (7)  
Remove the hydraulic fittings from the actuator.

 (8)  
Discard the O-ring packings and put a plug on the ports.

 S 024-014
 S 034-015
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A

737-300/400/500MAINTENANCE MANUAL
SEE A
DOWNLOCK SPRING
DOWNLOCK 
SPRING 
DOWNLOCK 
ACTUATOR 
FWD  INBD 
A 
Main Gear Downlock Actuator Installation 
Figure 401 

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737-300/400/500MAINTENANCE MANUAL
 TASK 32-32-51-404-003
 3. Main Gear Downlock Actuator Installation (Fig. 401)
　
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