757 MAINTENANCE MANUAL
HYDRAULIC MOTOR GENERATOR SYSTEM-
_________________________________ ADJUSTMENT/TEST
_______________
1. General_______
A. This procedure has two tasks.
(1)
The first task does an operational test of the hydraulic motor generator (HMG) system.
(2)
The second task does a system test of the HMG system.
TASK 24-25-00-715-001
2. Operational Test - Hydraulic Motor Generator System (Fig. 501)___________________________________________________
A. General
(1)
The operational test does a fast system check, and uses the EICAS displays to monitor the system.
(2)
A ground service cart or the alternating current motor pumps (ACMP) can supply hydraulic power.
B. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 29-11-00/201, Main Hydraulic Systems
C. Access
(1) Location Zones
211/212 Flight Compartment
D. Prepare for the Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-003
(2)
Make sure the EICAS circuit breakers on the overhead circuit breaker panel, P11, are closed.
S 865-004
(3)
Make sure these circuit breakers on the P11 panel are closed:
(a)
11R6, AC BUS SENSE LEFT
(b)
11R29, AC BUS SENSE RIGHT
S 865-005
(4) Make sure this circuit breaker on the main power distribution panel, P6, is closed:
(a) 6C3, HYD GEN CONT
S 615-006
(5) If you use the hydraulic service cart to pressurize the hydraulic system, do this procedure:
(a) Pressurize the left hydraulic system with the hydraulic service cart (AMM 29-11-00).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
24-25-00
ú ú 02 Page 501 ú Sep 28/00
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A
757 MAINTENANCE MANUAL
FLOW LIMITER (LOW FLOW)
FLOW LIMITER (HIGH FLOW)
SEE A
ACCUMULATOR
PRESSURE
GAGE
SEE D
CHARGING VALVE HYDRAULIC ACCUMULATOR
SEE B
B
HYD RETURN
HYD CASE LEFT WHEEL WELL
PORTPORT
A
HYD PRESSURE
PORT
HYD SERVO VALVE
HYD MOTOR
WIRING
ELECTRICAL HARNESS
CONNECTOR MOUNTING BOLTS (3 PLACES)
GENERATOR MANUAL OVERRIDE ARM POSITION INDICATOR
VALVE CLOSED
POSITION
HYD SEAL
DRAIN PORT
HYDRAULIC MOTOR-DRIVEN HYDRAULIC MOTOR-DRIVEN GENERATOR
GENERATOR SHUTOFF VALVE
DC
Hydraulic Motor-Driven Generator System Component Location Figure 501 (Sheet 1)
SEE C
VALVE OPEN POSITION
VALVE ACTUATOR MOTOR
ELECTRICAL CONNECTOR
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 5 KVA HMG ú
24-25-00
ú ú 01 Page 502 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
OVERHEAD CIRCUIT SEE E
BREAKER PANEL P11
SEE H
SEE G
RIGHT SIDE PANEL P61
MAIN POWER DIST PANEL P6
FLIGHT COMPT MAIN EQUIPMENT CENTER
CONTROL UNIT
HYD GEN HYD GEN TIME DELAY TIME DELAY RESET RLY CONT RLY HYD GEN HYD GEN MOUNTING K10568 K10563 VALVE CLOSE VALVE OPEN BOLTS
M10663 M10664 (4 PLACES)
HYD GEN 28V DC POWER RLY K10564
L AC BUS OFF SENSE RLY K10561
ELECTRICAL SENSE RLY R AC BUS OFF
CONNECTOR K10562
HYDRAULIC MOTOR-DRIVEN HYD GEN 115V AC 115V AC 115V AC
GENERATOR CONTROL UNIT
CONT UNIT INST TRANS L TRANS R TRANS M10662 BUS RLY BUS RLY BUS RLY F
K10565 K10566 K10567SEE F PTU SWITCH
HYD GEN POWER PANEL P71
E HYD GEN GEN FIELD MANUAL RESET PTU
TEST SWITCH
ON
TEST OFF W FIELD OFF FIELD W OFF FIELD W
AIR DATA CONFIG OFF
L CMPTR R T/O GND PROX L R APU
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