B.  Access
 (1)  
Location Zone
 143/144 MLG Wheel Well
 197 Wing to Body - Lower Half (Left)

 (2)  
Access Panels
 197KL Central Hydraulic Service Center

 C.  Prepare for the Removal
 S 494-002
 (1)  For the left or right hydraulic system, make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
 S 494-003
 WARNING: DO THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  For the left or right hydraulic system, open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
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 29-11-23
 ALL  ú ú 01 Page 401 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL 
HYDRAULIC RESERVOIR IN THE CENTER SYSTEM ASEE RESERVOIR PORT  1. SAMPLING VALVE RESERVOIR  BLEED SCREW 

3. O-RING
O-RING
VALVE
2. CAP
HYDRAULIC RESERVOIR
HYDRAULIC RESERVOIR
OUTLET
IN THE LEFT SYSTEM
IN THE RIGHT SYSTEM
SEEA  B
SEE A
SAMPLING VALVE
SEE B
DRAIN VALVE
HYDRAULIC RESERVOIR IN THE CENTER SYSTEM SHOWN (THE HYDRAULIC RESERVOIRS IN THE LEFT AND RIGHT SYSTEMS ARE ALMOST THE SAME)
A

Reservoir Sampling Valve Installation
Figure 401

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 29-11-23
 ALL  ú ú 01 Page 402 ú Dec 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 014-004
 (3)  
For the center hydraulic system, open the access panel, 197KL, for the central hydraulic service center (AMM 06-41-00/201).

 S 864-005

 (4)  
Remove the pressure from the applicable hydraulic system and the reservoir (AMM 29-11-00/201).

 S 864-006

 (5)  
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:

 (a)  
11K15, HYDRAULICS ELEC PUMP C1

 (b)  
11K16, HYDRAULICS ELEC PUMP RIGHT

 (c)  
11K24, HYDRAULICS ELEC PUMP C2

 (d)  
11K25, HYDRAULICS ELEC PUMP LEFT

 D. Remove the Sampling Valve
 S 684-007
 (1)  
Open the drain valve on the reservoir.

 S 684-008

 (2)
Drain the hydraulic fluid from the reservoir into a container.

 S 684-009

 (3)  
Close the drain valve after the hydraulic fluid drains from the reservoir.

 S 434-010

 (4)  
Safety the drain valve with a lockwire.

 S 024-011

 (5)  
Remove the sampling valve (1) from the reservoir.

 S 034-012

 (6)  
Remove the O-ring (3) from the sampling valve (1).

 (7)  
Install a cap on the opening in the reservoir.

 S 434-013
 TASK 29-11-23-404-014
 3. Install the Sampling Valve (Fig. 401)
　
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