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A

757 FAULT ISOLATION/MAINT MANUAL
ACCESS PANEL, 641BB,
ACCESS PANEL, 541BB, IN THE RIGHT WING
IN THE LEFT WING
HEAT EXCHANGER IN HEAT EXCHANGER IN
THE RIGHT SYSTEM
HEAT EXCHANGER IN
THE CENTER SYSTEM
THE LEFT SYSTEM
SEE X SEE X
SEE X
WING - BOTTOM VIEW
REAR SPAR OF THE WING (REF)
FWD
HEAT EXCHANGER
HEAT EXCHANGER (EXAMPLE)
(THE TOP SKIN OF THE WING IS NOT SHOWN)

X

Main (Left, Right, and Center) Hydraulic Systems - Component Location
Figure 102 (Sheet 9)

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757
MAINTENANCE MANUAL

 MAIN (LEFT, RIGHT, AND CENTER) HYDRAULIC SYSTEMS - MAINTENANCE PRACTICES
________________________________________________________________________
 1.  General
_______
 A.  This procedure has the tasks which follow:
 (1)  
Pressurize the Main Hydraulic Systems with a Hydraulic Service Cart

 (2)  
Pressurize the Main Hydraulic Systems with an Alternating Current Motor Pump (ACMP)

 (3)  
Pressurize the Left or Right Main Hydraulic System with an Engine-Driven Pump (EDP)

 (4)  
Pressurize the Reservoirs in the Main Hydraulic Systems with an External Air Source

 (5)  
Remove the Pressure from the Main Hydraulic Systems and Reservoirs

 (6)  
Hydraulic System Fluid Replacement.

 (a)  This procedure stops the hydraulic pressure sources and removes the pressure which stays in the hydraulic lines. This procedure also removes the air pressure from the reservoir.

 (7)  
Remove Hydraulic Power

 (a)  This procedure stops the main hydraulic system when the hydraulic pressure is not necessary. This procedure does not remove the pressure which stays in the system after the pressure sources stop.

 (8)  
Flush the Hydraulic System.

 (a)  This procedure flushes the left or right hydraulic systems after the replacement of a hydraulic pump which is defective.
 B.  There are three procedures to pressurize the left or right hydraulic systems: a hydraulic service cart, the system ACMP, or the system EDP. There are two procedures to pressurize the center hydraulic system: a hydraulic service cart or the system ACMPs.
　
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