12-8. SERVICE BRAKE HYDRAULIC ACCUMULATOR REPLACEMENT/REPAIR/TEST
Bleed accumulator (1).
Connect hose (2) on adaptor (3).
Position accumulator (1) so it is lower
than brake control valve.
Start engine (TM 10-3930-673-10) and
allow fifteen seconds for accumulator (1)
to charge. Stop engine (TM 10-3930-673-
Loosen hose (2) from adapter (3) and
bleed accumulator (1) until pressure
escapes and hydraulic oil appears.
Repeat Steps (3)(c) and (3)(d) two more
Install accumulator (1) on cab (6) with three
screws (4) and lockwashers (5).
c. Test and Adjust Service Brake Hydraulic
Accumulator Precharge Pressure.
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.
Install charging and gaging assembly to accumulator (1).
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.
Install charging and gaging assembly to accumulator (1)
Open isolator valve on charging and gaging assembly by turning
valve clockwise to a full stop.
Depress and hold pushbutton on top of charging and gaging
assembly until pressure reading is obtained on gage.