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 TM 10-3930-660-24-1
BRAKE HYDRAULIC ACCUMULATOR MAINTENANCE - CONTINUED
0132 00
TESTING - CONTINUED
NOTE
Do not connect nitrogen bottle to charging and gauging assembly at this time.
5.
Install charging and gauging assembly in place of cap (7) on accumulator (1).
6.
Open isolator valve on charging and gauging assembly by turning valve clockwise to a full stop.
7.
Depress and hold push button on top of charging and gauging assembly until pressure reading is obtained on gauge.
NOTE
The pressure reading obtained in step 7 is the accumulator precharge pressure. This reading must be 650-900
psi (4882-6205 kPa).
8.
If precharge pressure reading observed in step 7 is too low, add nitrogen to service brake hydraulic accumulator (1).
9.
Connect nitrogen charging bottle to charging and gauging assembly.
10.
Turn isolating valve on and admit nitrogen into diaphragm of accumulator (1). Do this slowly, checking the pressure
gauge reading at regular intervals.
11.
Repeat step 10 as necessary until precharge pressure is 650-900 psi (4882-6205 kPa).
12.
If precharge pressure reading observed is step 7 is too high, bleed nitrogen from service brake hydraulic accumulator
(1).
13.
Open bleeder valve on charging and gauging assembly to vent nitrogen from the accumulator diaphragm as required.
Leave the bleeder valve open for only a short period and then close it.
14.
Check the precharge pressure.
15.
Repeat steps 13 and 14 as necessary until precharge pressure is 650-900 psi (4882-6205 kPa).
16.
Remove charging and gauging assembly from service brake hydraulic accumulator (1).
17.
Close isolator valve by turning valve counterclockwise to a full stop.
18.
Remove charging and gauging assembly from accumulator (1).
19.
Install inner gas valve cap (7) and outer gas valve cap (6) to accumulator (1). Torque outer gas valve cap to 15-30 lb-ft
(20.3-40.7 Nm).
20.
Brush a soap solution on and around outer gas valve cap (6) and verify that no air bubbles are present.
NOTE
Air bubbles indicate nitrogen leakage. Correct any leakage before installing accumulator to vehicle.
21.
Secure service brake hydraulic accumulator (1) to cab with clamps (4).
END OF WORK PACKAGE
0132 00-5
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