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 A.  General
 (1)  This task contains two procedures, one to remove the pressure reducer valve, and one to remove the bypass valve. Because this task contains two procedures, only the applicable group of steps must be done.
 To start one of these procedures, do the "Prepare for the Removal" group of steps. Then, do the group of steps that is necessary to remove the component.
 B.  References
 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
24-22-00/201, Electrical Power - Control

 (3)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 C.  
Access

 (1)  
Location Zones 211/212 Control Cabin 311/312 Area Aft of Pressure Bulkhead to BS 1787.45

 (2)  
Access Panel 311AL Pressure Reducer Valves and Bypass Valve

 D.  
Prepare for the Removal

 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-002

 (2)  
Do the step that follows to remove the left or right pressure reducer valve or the bypass valve:

 (a)  
Remove the pressure from the right and left hydraulic systems and reservoirs (Ref 29-11-00/201).

 S 864-001
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A

757
MAINTENANCE MANUAL

PRESSURE REDUCER VALVES AND BYPASS VALVE
SEE A REDUCER VALVE FOR THE CENTER HYDRAULIC SYSTEM
SEE E
BYPASS VALVE
FOR THE REDUCER 
REDUCER VALVE  VALVES 
HYDRAULIC SYSTEM FOR THE RIGHT  SEE  C  LEFT HYDRAULIC SYSTEM REDUCER VALVE FOR THE 
SEE  B  SEE  D 

PRESSURE REDUCER
VALVE AND BYPASS VALVE

A

HYDRAULIC
LINES (3 LOCATIONS)

ELECTRICAL
CONNECTOR
(2 LOCATIONS)

BOLT WASHER (3 LOCATIONS)
REDUCER VALVE FOR THE RIGHT HYDRAULIC SYSTEM
B
Pressure Reducer Valves and Bypass Valve Figure 401 (Sheet 1)
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A

757
MAINTENANCE MANUAL

BOLT
HYDRAULIC  1
WASHER
LINES
(3 LOCATIONS)
(4 LOCATIONS)
BYPASS VALVE FOR THE REDUCER VALVES
C
HYDRAULIC LINES (3 LOCATIONS)
HYDRAULIC
LINES
(3 LOCATIONS)

ELECTRICAL CONNECTOR (2 LOCATIONS)
BOLT WASHER (3 LOCATIONS)
BOLT
REDUCER VALVE FOR THE LEFT HYDRAULIC SYSTEM
WASHER (3 LOCATIONS)
D
ELECTRICAL
CONNECTOR
(2 LOCATIONS)

REDUCER VALVE FOR THE CENTER HYDRAULIC SYSTEM
E 1  INSTALL THE WASHER WITH THE COUNTERSINK SIDE NEXT TO THE BOLT HEAD
Pressure Reducer Valves and Bypass Valve Figure 401 (Sheet 2)
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A

757
MAINTENANCE MANUAL

15.89 |0.01 INCHES (403.60 |0.25 mm), DO THE STEPS THAT FOLLOW:
1.
 PUT THE GAGE ASSEMBLY AGAINST THE BALLSCREW SO THAT THE BOLT HEADS ARE ON THE SHOULDERS OF THE UPPER AND LOWER STOPS

2.
 MAKE SURE THAT THE FEELER BLADE CAN BE PUT BETWEEN THE BOLT HEAD OF THE GAGE ASSEMBLY AND ON THE SHOULDER OF THE UPPER STOP (THIS WILL PREVENT PRELOADING)

Measurement of Stabilizer Dimension B
Figure 402

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