4-82. EMERGENCY VALVE MAINTENANCE (Con't).
Ensure that mating surfaces at tank sump (23) are clean.
Raise emergency valve into position above rear air reservoir. Connect jet level sensor tubing
(3 and 8) as tagged, to straight adapters (5 and 9). Remove any material used to tag jet level
sensor tubing and fittings.
Pull back on sump drain control lever (25) and install emergency valve with 16 new star-
washers (22) and bolts (21). Push on sump drain control lever to close. Install security bolt
Connect tubing (12 and 13) to straight adapters (11 and 14).
Pull coupling gasket (17) off piping assembly (16) and bridge gap between piping assembly
and emergency valve.
Install coupling (18) halves and two bolts (15) over coupling gasket (17). Ensure that edges
of coupling are seated in grooves of piping assembly (16) and emergency valve.
Rotate coupling (18) to about a 45 angle toward roadside to provide sufficient clearance to
install two nuts (19). Install two nuts and fully tighten.