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TM 10-3930-659-34
4-52.
ACCUMULATOR PRECHARGE TEST.
This Task Covers:
Precharge Test
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Parking brake set (see TM 10-3930-659-10).
•
Four preformed packings
•
Frame locking bar installed (see TM 10-3930-
659-10).
Personnel Required: Two
•
Left side cab skirt removed (see TM 10-3930-
References:
659-20).
•
Hydraulic system warmed to operating temperature
•
TM 10-3930-659-10
(see paragraph 2-28).
•
TM 10-3930-659-20
Tools/Test Equipment:
•
General mechanic's tool kit (Item 71, Appendix E)
•
Adapter (Item 1, Appendix E)
•
Adapter (Item 3, Appendix E)
•
Quick coupler (Item 18, Appendix E)
•
Pressure gage (Item 31, Appendix E)
•
Hose assembly (Item 37, Appendix E)
•
Tee (Item 63, Appendix E)
PRECHARGE TEST
WARNING
Pressure stored in accumulator Is approximately 500 psi (3448 kPa). Ensure that
accumulator pressure Is relieved before removing service brake hoses or
components. Failure to follow this warning may result in serious injury or death to
personnel.
NOTE
•
It is necessary to hold boot of one brake pedal with hand while opposite brake
pedal is pumped. Movement inside boot will be felt as opposite brake pedal is
pumped. Accumulator pressure is relieved when movement stops.
•
Each brake pedal should be pumped a full 75 times even if no movement is felt
after pumping brake pedal several times.
1.
Hold boot (3) of left brake pedal (4) with hand and pump right brake pedal (1) 75 times. Release boot.
4-192
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