4-11. AUTOMATIC BRAKE VALVE (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
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 aid immediately.
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use
only with effective chip guarding the personal protective equipment (goggles/shield,
Do not use metallic tools to clean chokes. The use of metallic tools will change size
of chokes, resulting in failure of brake valve system.
To avoid misplacement of chokes, remove and replace one choke plug at a time.
46. Clean, inspect, and repair choke plugs (117), (118), (119), (120), and (121) by the following:
Remove a choke plug and place in dry-cleaning solvent.
Inspect passage for cleanness. Use compressed air and remove foreign matter.
Remove each choke plug from dry-cleaning solvent and dry with compressed air. Check that choke plug is clean
Lightly coat threads of each choke plug with compound consisting of one part graphite and two parts oil. Install
choke plugs (117) thru (121).
47. Use pneumatic grease and lubricate O-rings, O-ring grooves in cutoff valve (15), suppression valve (44), vent valve
cage (54), cutoff valve cage (64), inlet valve (76), exhaust valve cage (106), supply valve cage (116), and bushings
into which spool valves and cages enter. Use a clean wiping rag and remove excess lubricant.