Adjust Accumulator Charging Pressure

TM 10-3930-673-20-2

CAUTION

Brake system and hydraulic accumulator must be bled as soon as brake control valve is installed. If not

done, air in system may not allow brakes to release and may cause severe brake system damage.

(f)

Bleed hydraulic accumulator (Para 12-8).

(g)

Bleed brake system (Para 12-5).

c. Adjust Accumulator Charging Pressure.

NOTE

Accumulator charging pressure is

adjusted at brake control valve.

(1)

Pump brake pedal

(TM 10-3930-673-10) to relieve service brake

hydraulic accumulator pressure.

With engine OFF (TM 10-3930-673-10), pump

brake pedal (TM 10-3930-673-10) until no power

assistance is felt through pedal. This will require

approximately 20 depressions of brake pedal.

TR00598

(2)

Remove hoses (9 and 10), tee (6) and

preformed packing (32) from service brake

control valve (23).

(3)

Install pressure gauge in accumulator port (44) on service brake control valve (23).

NOTE

Note pressure gauge reading when click is heard in Step (4) below.

(4)

Start engine (TM 10-3930-673-10) and listen for click of accumulator charging valve inside service brake

control valve (23).

(5)

If necessary, adjust accumulator charging pressure.

(a)

If pressure is less than 1700-1800 psi (11721 to 12411 kPa) - 2350 to 2450 psi (16203 to 16892 kPa) fully

charged at time click is heard, turn adjusting plug (45) on valve (23) clockwise until pressure is within

specifications.

(b)

If pressure is greater than 1700-1800 psi (11721 to 12411 kPa) - 2350 to 2450 psi (16203 to 16892 kPa) fully

charged at time click is heard, turn adjusting plug (45) on valve (23) counterclockwise until pressure is

within specifications.

(6)

Remove pressure gauge from accumulator port (44) on service brake control valve (23).

NOTE

Follow-on Maintenance: Bleed brake system (Para 12-5).

END OF TASK

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