Parking Brake Accumulator System - Parking Brake Set - Troubleshooting Figure 102
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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
BRAKE ACCUMULATOR SYSTEM PRESSURE BLEED-DOWN RATE IS TOO HIGH. TURNING ON PUMPS TO 10 MINUTES AFTER WAITING LESS THAN START TEST ALLOW 10 MINUTES WITH PUMPS RUNNING FOR ACCUMULATOR TEMPERA-TURES TO STABILIZE.
INCORRECT ACCUMULATOR PRECHARGE CHECK PRECHARGE WITH BRAKE SYSTEM DEPRESSURIZED. (AMM 12-51-11/301) SERVICE ACCUMULATOR
BRAKE ACCUMULATOR CHECK VALVE LEAKING (CHECK VALVE UPSTREAM OF ACCUMULATOR) REPLACE CHECK VALVE.
PRESSURE RELIEF VALVE LEAKING (FOR AIRPLANES EQUIPPED WITH THIS VALVE) BRAKE ACCUMULATOR BLEED-DOWN TEST. PLUG RELIEF VALVE AND DO THE REPLACE BRAKE ACCUMU-LATOR PRESSURE RELIEF VALVE (AMM 32-41-71/ 401).
BRAKE METERING VALVE LEAKING INTERNALLY PLUG A AND B SYSTEM PRESSURE INPUTS TO SUSPECT BRAKE METERING VALVE AND DO THE BLEED-DOWN TEST. REPLACE BRAKE METERING VALVE (AMM 32-41-21/ 401).
Parking Brake Accumulator System - Parking Brake Released - Troubleshooting Figure 103
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E86577
A
737-300/400/500MAINTENANCE MANUAL
PARKING BRAKE SYSTEM - ADJUSTMENT/TEST
______________________________________
TASK 32-44-00-825-001
1. Parking Brake System Adjustment
_______________________________
A. Standard Tools and Equipment
(1)
Chocks - Wheel
(2)
Rigging pins - 0.309/0.311 inch diameter by 6.8 inches long (one required)
NOTE: These rigging pins are part of F70207-69 or F70207-78
____
B. Access
(1)
Location Zones
101 Control Cabin - Left
102 Control Cabin - Right
C.
Adjust the Parking Brake System (Fig. 501)
S 495-002
(1)
Install the chocks on the wheels and release the parking brake.
S 825-003
(2)
Adjust the pawls on the lockshaft:
(a)
Extend the pawls one turn at a time until the parking brake can not be set.
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