est and Adjust Service Brake Hydraulic Accumulator Precharge Pressure.

TM 10-3930-673-20-2

12-8. SERVICE BRAKE HYDRAULIC ACCUMULATOR REPLACEMENT/REPAIR/TEST

(CONT)

(3)

Bleed accumulator (1).

(a)

Connect hose (2) on adaptor (3).

(b)

Position accumulator (1) so it is lower

than brake control valve.

(c)

Start engine (TM 10-3930-673-10) and

allow fifteen seconds for accumulator (1)

to charge. Stop engine (TM 10-3930-673-

10).

(d)

Loosen hose (2) from adapter (3) and

bleed accumulator (1) until pressure

escapes and hydraulic oil appears.

Tighten hose.

(e)

Repeat Steps (3)(c) and (3)(d) two more

times.

(4)

Install accumulator (1) on cab (6) with three

screws (4) and lockwashers (5).

c. Test and Adjust Service Brake Hydraulic

Accumulator Precharge Pressure.

(1)

Pump brake pedal (TM 10-3930-673-10) to relieve 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.

(2)

Install charging and gaging assembly to accumulator (1).

(a)

Remove two screws (7), outer gas valve cap (8), and inner gas

valve cap (9) from accumulator (1).

Do not connect nitrogen bottle to charging and gaging assembly

at this time.

(b)

Install charging and gaging assembly to accumulator (1)

charging port.

(c)

Open isolator valve on charging and gaging assembly by turning

valve clockwise to a full stop.

(3)

Depress and hold pushbutton on top of charging and gaging

assembly until pressure reading is obtained on gage.

TR00925

12-26