24-25-04
 ú ú 03 Page 401 ú Jan 28/02
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A

757
MAINTENANCE MANUAL

LEFT WHEEL WELL SEE A  A 
HYDRAULIC LINE 
UNION SUPPORT CLAMP  ACCUMULATOR PRESSURE GAGE CHARGING VALVE  HYDRAULIC MOTOR-DRIVEN GENERATOR 
PRESSURE ACCUMULATOR SUPPORT CLAMP GAGE  PLACARD SERVICING A  FWD LEFT WHEEL WELL A 
UNION 
DUST CAP 
PLACARD SERVICING  CHARGINE LINE  CHARGING VALVE 
A-A 
Hydraulic Motor-Driven Generator Accumulator Installation Figure 401 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 5 KVA SYSTEM ú

 24-25-04
 ú ú 02 Page 402 ú May 28/99
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A
757
MAINTENANCE MANUAL

SERVICE CENTER CENTRAL HYDRAULIC BSEE  A 
ASEE LEFT WHEEL WELL 
LINE HYDRAULIC  ACCUMULATOR  GENERATOR HYDRAULIC MOTOR 
UNION 
CLAMP SUPPORT  A  FWD  CHARGING LINE 
ACCUMULATOR  A LEFT WHEEL WELL 
CLAMP SUPPORT  GAGE PRESSURE CHARGING LINE 
UNION  DUST CAP 
VALVE CHARGING 
A-A  LINE CHARGING  CENTRAL HYDRAULIC SERVICE CENTER B 
Figure 401A Hydraulic Motor Generator Accumulator Installation 

A51185
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10 KVA SYSTEM ú

 24-25-04
 ú ú 03 Page 403 ú May 28/99
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MAINTENANCE MANUAL

 S 864-012
 (4)  Remove the pressure from the HMG accumulator:
 (a)  
AIRPLANES WITH 10 KVA HMG; Open the access panel 197KL for the central hydraulic service center.

 (b)  
Remove the dust cap from the accumulator nitrogen charging valve.

 (c)  
Loosen the swivel nut at the charging valve, to bleed all the pressure from the accumulator (Ref 12-15-06).

 E. Procedure
 S 024-002
 (1)  Remove the HMG accumulator as follows:
 (a)  
Disconnect the charging line from the lower end of the accumulator. Discard the O-ring on the union.

 (b)  
Disconnect the hydraulic line from the upper end of the accumulator. Cap line and discard O-ring on union.

 (c)  
Loosen the nuts and open the accumulator support clamps.

 (d)  
Remove the HMG accumulator.

 (e)  
Remove the unions from the top and bottom of the accumulator. Keep for installation.

 (f)  
Plug the accumulator ports.

 TASK 24-25-04-424-004
 3. Install the HMG Accumulator (Fig. 401)
___________________________
 A. Consumable Materials
 (1)  
Fluid, Hydraulic - BMS 3-11 (Ref 20-30-04)

 (2)  
Lubricant, Hydraulic System Fittings - MCS 352
 (Ref 20-30-04)

 B. References
 (1)  
12-15-06/301, Hydraulic Motor Generator Accumulator

 (2)  
20-30-04/201, Lubricants

 C. Access
 (1)  
Location Zones
 143 Main Landing Gear Wheel Well (LH Side)

 (2)  
Access Panels
 732 Main Landing Body Door (LH Side)

 D. Prepare for Installation
 S 644-008
 (1)  Lubricate the new O-rings with hydraulic fluid or lubricant (Ref 20-30-04).
 (a)  
Install the O-rings on the unions.

 (b)  
Install the unions on the accumulator.

 S 214-009
 (2)  Visually examine the HMG accumulator support clamps. Replace the clamps if they are cracked or broken.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
　
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