1850
1750 1650 1550
-50 -25 .0 +25 +50 +75
CHARGING
AMBIENT TEMP DEGREES CELSIUS
VALVE
CHARGING
LINE
SERVICING PLACARD A-A B
Hydraulic Motor Generator Accumulator Servicing
Figure 301
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH A CHARGING VALVE IN THE ú
12-15-06
MAIN LANDING GEAR WHEEL WELL. ú CONFIG 1 ú 01 Page 302 ú Sep 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A73902
A
757
MAINTENANCE MANUAL
S 863-006-001
(2) If the pressure shown is above the specified limits, do these steps:
(a) Remove the cap from the charging valve.
WARNING:_______ LOOSEN THE CHARGING VALVE A SMALL INCREMENT TO RELEASE
THE ACCUMULATOR PRESSURE. INTERNAL PRESSURE CAN BLOW THE
CHARGING VALVE OUT AND CAN CAUSE INJURY TO PERSONS.
(b) Loosen the charging valve a small increment to release the
pressure to the limits shown on the servicing placard.
S 863-007-001
(3) If the pressure shown is below the specified limits, do these steps:
(a) Remove the charging valve cap, and attach the nitrogen source.
(b) Loosen the swivel nut one turn.
(c) Add nitrogen to the accumulator to the pressure shown on the
placard.
(d) Tighten the swivel nut.
(e) Remove the nitrogen source, and install the valve cap.
S 863-008-001
(4) Pressurize the left hydraulic system if it is necessary
(Ref 29-11-00/201).
S 093-009-001
WARNING: USE THE PROCEDURE IN AMM 32-00-15 TO REMOVE THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(5) Remove the door locks, and close the landing gear doors (Ref 32-00-15/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH A CHARGING VALVE IN THE ú
12-15-06
MAIN LANDING GEAR WHEEL WELL. ú CONFIG 1 ú 01 Page 303 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
HYDRAULIC MOTOR GENERATOR ACCUMULATOR - SERVICING
_________________________________________________
1. General
_______
A. This procedure contains the data necessary to do the servicing of the 10kva hydraulic motor generator (HMG) accumulator.
TASK 12-15-06-613-001-002
2. HMG Accumulator Servicing
__________________________
A. References
(1) AMM 29-11-00/201, Main Hydraulic Systems
B. Equipment
(1) Pressurized Nitrogen Source (2000 psi)
C. Access
(1)
Location Zones
1974 Wing to Body - AFT Lower Half (Left)
(2)
Access Panels
197KL Central Hydraulic Service Center
D. Prepare to do the HMG Accumulator Servicing.
S 013-009-002
(1)
Open the access panel 197KL for the central hydraulic service center.
S 863-002-002
(2)
Remove the pressure from the left hydraulic system
(AMM 29-11-00/201).
E. Do the HMG Acumulator Servicing
S 213-003-002
(1) Do a check of the pressure shown on the accumulator pressure gage.
(a)
If the accumulator pressure is within the limits specified on the servicing placard, no servicing is required.
(b)
If the pressure is not within the specified limits, service the accumulator.
S 863-004-002
(2) If the pressure shown is above the specified limits, do these steps:
(a) Remove the cap from the charging valve.
WARNING: LOOSEN THE CHARGING VALVE A SMALL INCREMENT TO RELEASE
_______ THE ACCUMULATOR PRESSURE. INTERNAL PRESSURE CAN BLOW THE CHARGING VALVE OUT AND CAN CAUSE INJURY TO PERSONS.
(b) Loosen the charging valve a small increment to release the pressure to the limits shown on the servicing placard.
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