4-110. HEATER AIR VENT FRAME REPLACEMENT (M373A3, M373A4, AND M373A5).
This Task Covers:
Cleaning and Inspection
General mechanic's tool kit
zDrill bit set
Z Rivet gun
Four rubber strips
Open cover (9) and remove three screws (5) and retainers (4) securing grille (3) to frame (1). Remove grille.
Remove 12 screws (2) securing frame (1) to heater duct.
Remove nine rivets (11) securing hinge (1 O) to semitrailer. Remove hinge with cover (9) from frame (l). Remove
coated cloth from hinge. Discard rivets and coated cloth.
Remove 35 rivets (23) securing frame (1) to semitrailer. Remove frame. Discard rivets.
Remove nine rivets (12) securing hinge (1 O) to cover (9). Remove hinge. Discard rivets.
Remove five studs (15) from cover (9).
Remove four rivets (14) securing each shield hinge (18) to cover (9). Remove shields (17) and shield hinges.
Remove four rivets (19) securing each shield hinge (18) to shield (17). Remove shield hinges from shields.
Remove wingnut (7) and retainer (8) from screw (13). Remove screw from cover (9).
Remove rubber strips (6 and 16) from cover (9). Discard rubber strips.
Remove two locknuts (24) and thumbscrews (20) from frame (l). Discard locknuts.
Remove two rivets (21 ) securing each receptacle (22) to frame (1). Remove receptacles from frame. Discard
CLEANING AND INSPECTION
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective goggles
and gloves, and use only in a well-ventiiated area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO NOT use near open frame or excessive heat.
The solvent's flash point is 100F-138F (38C-59C). 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.
Clean all parts with dry cleaning solvent and dry thoroughly. Ensure that bonding surfaces on cover for rubber
strips are clean and dry.