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TM 10-3930-659-20
10-6.
BRAKE VALVES LEAKAGE TEST.
This task covers: Leakage Test
Initial Setup.
Equipment Conditions:
Materials/Parts:
•
Parking brake set (see TM 10-3930-659-10).
•
Rags (Item 27, Appendix C)
•
Frame locking bar installed (see TM 10-3930-
•
Two preformed packings
659-10)
•
Front cab skirt removed (see paragraph 14-6)
Personnel Required: Two
•
Hydraulic system warmed to operating
temperature (see paragraph 2-29).
References:
Tools/Test Equipment:
•
TM 10-3930659-10
•
General mechanic's tool kit (Item 44, Appendix F)
•
Plug (two) (Item 28, Appendix F)
NOTE
•
Accumulator pressure should not be relieved prior to
performing leakage test. Pressing brake pedal will cause
test to be Inaccurate.
•
A suitable container should be used to catch any draining
hydraulic fluid. Ensure that all spills are properly cleaned.
LEAKAGE TEST
1.
Remove hose (2) and preformed packing (4) from left brake valve (5). Discard preformed packing.
2.
Install plug (3) on hose (2).
3.
Remove hose (8) and preformed packing (7) from right brake valve (6). Discard preformed packing.
4.
Install plug (1) on hose (8).
5.
Place suitable containers under left and right brake valves (5 and 6). Measure amount of hydraulic fluid leakage
from brake valves for one minute. Replace brake valve if leakage is more than 0.5 oz (14.8 ml) per minute (see
paragraph 10-9).
6.
Remove plug (1) from hose (8).
7.
Install new preformed packing (7) and hose (8) on right brake valve (6).
8.
Remove plug (3) from hose (2).
9.
Install new preformed packing (4) and hose (2) on left brake valve (5).
10-18
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