S 862-029

 (2)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 F.  Remove Power from the A or B Hydraulic System when Power is Supplied with the Engine-Driven Pump [EDP]
 S 862-031
 (1)  Stop the engine (AMM 71-00-00/201).
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 S 862-032
 (2)  Keep the switch for the EDP in the ON position.
 NOTE:____The engine-driven pumps should be left on. This will increase the life of the depressurization solenoid which becomes energized when the pump switch is put in the OFF position.
 S 862-033
 (3)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 G. Remove Power from the Standby Hydraulic System
 S 862-035
 (1)  Put these switches in these positions:
 (a)  
FLIGHT CONTROL A to the A ON position

 (b)  
FLIGHT CONTROL B to the B ON position

 (c)  
ALTERNATE FLAPS to the OFF position.

 S 862-036
 (2)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 29-15-00-172-037
 4.  Flush the A or B Hydraulic System_________________________________
 A. General
 WARNING:_______HYDRAULIC FLUID, BMS 3-11, CAN CAUSE INJURY TO PERSONS. IF YOU GET THE HYDRAULIC FLUID ON YOUR SKIN, FLUSH YOUR SKIN WITH WATER. IF YOU GET THE HYDRAULIC FLUID IN YOUR EYES, FLUSH YOUR EYES WITH WATER AND GET MEDICAL AID. IF YOU EAT OR DRINK THE HYDRAULIC FLUID, GET MEDICAL AID.
 (1)  
Obey this warning during all of this task.

 (2)  
Use this procedure to flush the hydraulic system after you have replaced a broken engine-driven pump or electric motor driven pump.

 (3)  
If there is chemical contamination in the hydraulic fluid, the hydraulic fluid and the filter elements must be replaced (AMM 29-00-00/201).

 (4)  
When you work on parts from the hydraulic system, flush them only with BMS 3-11 hydraulic fluid. This keeps contamination out of the hydraulic system.

 B. References
 (1)  
AMM 29-09-00/201, Hydraulic Reservoir Pressureization System

 (2)  
AMM 29-15-34/201, Hydraulic Sys A, B and Standby EMDP Case Drain Filter

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737-300/400/500MAINTENANCE MANUAL
 (3)  
AMM 29-15-61/201, Hydraulic Systems A and B Return Filter

 (4)  
AMM 29-15-71/201, Hydraulic Systems A and B Pressure Module

 (5)  
AMM 29-15-91/201, Case Drain Filter - EDP

 C. Access
 (1)  Location Zones
 101/102 Control Cabin
 216/217 Left/Right Main wheel Well

 D. Procedure
 S 862-039
 (1)  
Do the procedure above to remove power from the applicable hydraulic system.

 S 862-040

 (2)  
Remove the pressure from the applicable hydraulic reservoir (AMM 29-09-00/201).

 S 962-041

 (3)  
Replace the filter element of the case drain filter for the
 engine-driven pump (AMM 29-15-91/201).

 S 962-051

 (4)  
Replace the filter element of the case drain filter for the electric motor driven pump (AMM 29-15-34/201).

 S 962-042

 (5)  
Replace the filter element for the pressure filter (AMM
 29-15-71/201).

 (6)  
Replace the filter element for the return filter (AMM 29-15-61/201).

 S 862-044

 (7)  
Pressurize the hydraulic system with the applicable pump, engine-driven pump or electric motor driven pump.

 S 862-045
　
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