4-21. HORN ASSEMBLY (cont)
CLEANING, INSPECTION, AND REPAIR
· Dry-cleaning solvent P-D-680 is toxic and
flammable. Wear protective goggles and gloves
and use only in a well-ventilated area. Avoid
contact with skin, eyes, and clothes and don't
breathe vapors. Do not use near open flame or
excessive heat. The flash point is 100 - 138°F
(38 - 59°C). If you become dizzy, get fresh air
and medical aid immediately. If contact with
eyes is made, wash your eyes and get medical
· Compressed air used for cleaning purposes will
not exceed 30 psi (207 kPa). Do not direct
compressed air against skin. Use goggles or
full face shield.
Clean metal parts in dry-cleaning solvent and dry with compressed air.
Clean seals with compressed air.
Inspect horn for cracks, breaks, and damage. Inspect seals for serviceability.
Repair consists of replacement of damaged parts.
The horn is made of aluminum. Screws (8) and (13)
should always be replaced with low torque screws.
Install seal (15) in horn body (16). Place diffuser (14) in body and install three screws (13).
Place diaphragm disc (12), cushion ring (11), and diaphragm disc (10) in cap (9). Place cap on horn body (16)
and install six screws (8).
Position horn assembly (7) on base (3) and install two screws (5) and lockwashers (6).
Place gasket (4) on base (3). Install base on hood and install four screws (1) and lockwashers (2).
Start locomotive (para. 2-11). After air pressure buildup, check horn for proper operation.