4-20.DUST PLUG, DUST CAP AND TANK COUPLINGS REPAIR.- continued.
Dry cleaning solvent, A-A-711 Type I used to clean parts, is potentially dangerous to personnel
and property. Avoid repeated and prolonged skin contact by wearing rubber or nonporous
gloves when handling solvents or material, wet with dry cleaning solvent. Wash hands
immediately after exposure with soap and water and use a lanolin based skin cream to prevent
skin drying. Do not use near open flame or excessive heat. Do not work with solvent in a
closed room. Be sure there is good ventilation or the solvent vapors will build up in the air and
become a poisonous mixture which can cause physical injury or even death.
Clean all components removed with dry cleaning solvent and dry with a clean wiping rag.
For steps c through e refer to figure 4-10.
Inspect dust plug (4) for damaged mating surface.
Inspect inlet coupling (8) for damaged mating surface, stripped threads, cracks and broken or damaged
locking arms (7).
Inspect dust cap (13) for damaged mating surface.
Inspect outlet coupling (16) for damaged mating surface, stripped threads, cracks and broken or
damaged locking arms (15).
Replaced damaged components. Refer to Appendix G. Figure G-2, for fabrication of sash chains.
Replace all gaskets.
Do not apply excessive pressure with fingers when cleaning or applying sealant onto threads.
Sharp threaded edges could cause injury.
Apply sealant on outlet pipe threads on outlet coupling (16) and install on tank (6).
Install new gasket (17) in dust cap (13).
Install dust cap (13) on outlet coupling (16) and push against locking arms (15) to lock dust cap in place.
Attach split rings (10 and 1) to chain (12), dust cap (13) and tab (14).
Apply sealant on inlet pipe threads and install inlet coupling (8) on tank (6).