TM-9-2330-335-14-P
SEMITRAILER, TACTICAL, BREAKBULK/CONTAINER TRANSPORTER, 22-1/2 TON, RESET M871R, M871A1R AND M871A2R
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE MANUAL (INCLUDES REPAIR PARTS AND SPECIAL TOOLS LIST)
SEPTEMBER 2008
TM-9-2330-335-14-P - Page 616 of 640
TM 9-2330-335-14&P
0110-4
0110
BRAKE RELINE/CHECKING PROCEDURE
000110
1.
Rotate the adjustment hex counterclockwise approximately 1/2 turn to create excessive brake lining to drum
clearance.
2.
Apply the brakes.
3.
On release of brakes, observe the adjustment hex rotation. This rotation indicates the ASA is making an adjustment and is
working properly.
NOTE
Placing a 7/16 in. (11 mm) box end wrench on the hex adjustment will make the movement easier
to see.
4.
On each subsequent brake release, the amount of adjustment and push rod stroke will be reduced until proper clearance
is achieved.
5.
During brake reline, check the de-adjustment torque. Place a 7/16 in. (11 mm) torque wrench on the adjustment hex. Turn
the hex counterclockwise and check that the clutch does not slip at a torque LESS than 13 lb-ft (17.6 Nm). A ratcheting
sound should occur. If the clutch slips at a lesser torque (less than 13 lb-ft [17.6 Nm]), the ASA must be replaced.
END OF TASK
BRAKE TROUBLESHOOTING
000110
NOTE
•
The ASA is NOT a cure-all for foundation brake deficiencies.
•
If the proper push rod stroke cannot be maintained, be sure to thoroughly check the other brake
components.
•
This check could also avoid unnecessary ASA replacement.
1.
Check the foundation brake for:
a.
Worn camshaft and bushings
b.
Broken shoe return springs
c.
Air chambers not releasing
d.
Worn or broken brake components
e.
Loose wheel bearings
2.
Check the ASA for:
a.
Proper push rod stroke
b.
Proper ASA installation
c.
Loose, broken, or bent adjuster brackets
d.
Worn clutch assembly
e.
Adjuster not fully releasing
END OF TASK
END OF WORK PACKAGE
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