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757 MAINTENANCE MANUAL
 TASK 29-33-51-424-020
 3.  Install the Monitor Unit________________________
 A. References
 (1)  
AMM 06-41-00/201, Fuselage Access Doors and Panels

 (2)  
AMM 12-12-01/301, Hydraulic Systems

 (3)  
AMM 20-10-01/401, E/E Rack Mounted Components

 (4)  
AMM 24-22-00/201, Electrical Power - Control

 B. Access
 (1)  
Location Zones
 119 Main Equipment Center (Left)
 211/212 Control Cabin
 822 No. 2 Cargo Door

 (2)  
Access Panel
 119BL Main Equipment Center

 C. Install the Monitor Unit (Fig. 401)
 S 424-021
 (1)  
Install the monitor unit (AMM 20-10-01/401).

 S 864-022

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 864-023

 (3)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead panel, P11:

 (a)  
11K19, HYDRAULICS QTY CTR

 (b)  
11K20, HYDRAULICS QTY LEFT

 (c)  
11K21, HYDRAULICS QTY RIGHT

 (d)  
EICAS (6 locations)

 S 714-024
 (4)  Push the ELEC/HYD switch on the EICAS MAINT panel on the right side panel, P61.
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757 MAINTENANCE MANUAL
 (5)  S 614-025Move the valve handle for the reservoir fill selector to the reservoir that will be filled.
 (6)  S 614-026Fill the reservoir until you can see the fluid level in the center of the reservoir sight glass (AMM 12-12-01/301).
 (7)  S 214-027Make sure the EICAS HYD QTY display shows 1.00 | 0.08 (for the left or right system) or 1.00 | 0.14 (for the center system).
 (8)  S 414-029Close the access door for the main equipment center, 119BL, for access to the E3 rack (AMM 06-42-00/201).
 (9)  S 864-044Remove electrical power if it is not necessary (AMM 24-22-00/201).

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757 MAINTENANCE MANUAL
 HYDRAULIC RESERVOIR PRESSURE INDICATION SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________________________________
 1.  General_______
 A.  Each hydraulic reservoir is pressurized by the pneumatic system. The pressure indication system monitors the air pressure in each system reservoir. Messages for high or low air pressure are shown on the EICAS display.
 2.  Component Details_________________
 A.  EICAS Display
 (1)  
System indication consists of messages on the EICAS display. If both engines are running and reservoir pressure is less than 17 psi, the EICAS will automatically display a (L, R, C) HYD RSVR PRES message and the RSVR light on the hydraulic control panel will illuminate.
　
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