ONE MAIN LANDING GEAR GOES INTO LOCKED POSITION WITH EXCESSIVE FORCE. 

Check for reduction in operating speed near end of actuator travel. IF -

Operating speed increases, bleed air from actuator. 

BOTH MAIN LANDING GEARS RETRACT AND EXTEND VERY SLOWLY. 

Check rigging of selector valve control linkage. IF -
No change in operating speed change actuator. 
OK - Check for restriction in line from selector valve. IF -

NOT OK - Flush or change hydraulic lines. 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

ONE MAIN LANDING GEAR FAILS TO LOCK IN UP POSITION. 

Check for hydraulic pressure at uplock actuator. IF -

OK - Check hydraulic lines to uplock actuator for obstruction or kinks. IF -NOT OK - Change uplock actuator restrictor check valve on modular package.
kinks. IF -tor for blockage or lines to downlock actua-OK - Check hydraulic 

replace hydraulic lines. NOT OK - Flush or 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MAIN LANDING GEAR EXTENSION AND RETRACTION - ADJUSTMENT/TEST
____________________________________________________________
 1.  General
_______
 A.  This procedure has these two tasks:
 (1)  
The first task does an extension/retraction test of the main landing gear after you replaced or adjusted a landing gear component.

 (2)  
The second task does an operational test of the main landing gear.

 B.  
The times for gear retraction in the operational test depend on the hydraulic flow rate. The retraction times given in this procedure are based on a minimum flow rate of 19 gpm at a hydraulic system pressure of 3000 + -150 psi. Hydraulic pressure can be supplied by a hydraulic test bench or the engine driven pumps to give this minimum flow rate.

 C.  
The electric motor driven pump (EMDP) can be used for the component replacement test. When you use the EMDP operate only one Landing gear at a time. The EMDP provides a hydraulic flow rate of approximately 6 gpm. This lower rate causes slower landing gear operation, especially if you operate more than one gear at the same time. Do not use the EMDP to measure extension/retraction times.

 TASK 32-32-00-705-064
 2.  Main Landing Gear Test - Component Replacement
_______________________________________________
 A.  Standard Tools and Equipment
 (1)  
Test Bench - Hydraulic: 0-3000 psi, 20 GPM at 3000 psi, with nominal filtration of 5 and 15 microns absolute

 B.  
References

 (1)  
AMM 07-11-11/201, Jack Airplane

 (2)  
AMM 12-12-00/301, Hydraulic Reservoir

 (3)  
AMM 20-40-11/201, Static Grounding

 (4)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 (5)  
AMM 32-00-01/201, Ground Lock Assemblies

 C.  
Access

 (1)  
Location Zone
 101,102 Control Cabin
 202 Lower Nose Compartment

 (2)  
Access Panels
 1101 External Power Receptacle Door
 1103 Forward Access Door

 D.  
Prepare for the Test

 (1)  
Ground the airplane (AMM 20-40-11/201).

 (2)  
Lift the airplane on jacks (AMM 07-11-11/201).

 S 915-053
 S 585-054
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