TM 9-2330-359-14&P
4-38. AIR COUPLING MAINTENANCE (M872).
This Task Covers:
a.
Removal
c.
Assembly
b.
Disassembly
d. Installation
Initial Setup:
Equipment Conditions:
• Semitrailer uncoupled
2-18).
Tools/Test Equipment:
Materials/Parts:
from towing vehicle (para
Antiseize tape (Hem 14, Appendix E)
One Iockwasher
One preformed packing
• General mechanic’s tool kit
NOTE
Service and emergency air couplings are maintained the same way.
a.
REMOVAL
1.
Remove eight screws (3) and nose box cover (2)
from nose box (1).
2.
Disconnect air hose (4) from reducer pipe (11).
3.
Remove nut (5) and Iockwasher (6) from reducer
pipe (11). Discard Iockwasher.
—
4.
Remove air coupling (9), elbow (10), and reducer
pipe (11) as an assembly from nose box (1).
b.
DISASSEMBLY
1.
Remove reducer pipe (11) and elbow (10) from air
coupling (9).
2.
Remove dummy coupling (7) and preformed
packing (8) from air coupling (9). Discard pre-
formed packing.
c.
ASSEMBLY
1.
Install new preformed packing (8) and dummy coupling (7) in air coupling (9).
2.
Apply antiseize tape to male threads of elbow (10) and reducer (11), and install elbow and reducer pipe in air
coupling (9).
TA508033
4-67
