4-46. AIR COUPLING REPLACEMENT.
This Task Covers:
Cleaning and Inspection
. Semitrailer uncoupled
from towing vehicle (para
l Dry cleaning solvent (Item 14, Appendix E)
l Antiseizing tape (Item 16, Appendix E)
l One preformed packing
. General mechanics tool kit
Use this task for either the EMERGENCY or
SERVICE air coupling. EMERGENCY air cou-
pling is shown.
Hold fitting (2) with wrench and remove air
Work preformed packing (3) out of air coupling (1).
Discard preformed packing.
b. CLEANING AND INSPECTION
Clean mud and dirt from all exposed surfaces of air coupling with water and stiff brush.
Dry cleaning solvent, P-D-680, Is toxic and flammable. Always wear protective goggles
and gloves, and use only in a well-ventilated area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO NOT use near open flame or excessive heat.
The solvents flash point is 100°F-138°F (38°C-59°C). If you become dizzy while
using cleaning solvent, immediately get fresh air and medical help. If solvent contacts
eyes, immediately wash your eyes and get medical aid.
Remove grease from air coupling with dry cleaning solvent.
Inspect air coupling for damaged threads or cracks. Replace air coupling if defective.
Install new preformed packing (3) in air coupling (1).
Apply antiseizing tape to threads of air coupling (1). Install air coupling in fitting (2) until an airtight seal is made
and air coupling face is vertical toward the left side of the semitrailer.