ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
REPAIR PRESSURE CONTROL
DIAPHRAGM VALVE REMOVAL AND DISASSEMBLY (Refer to figure 1.)
Tool Kit, General Mechanic Automotive
Shop Equipment, Automotive Maintenance and
Repair: Organizational Maintenance Common No. 1
Remove the plug (1) from the cover (2), position pressure control over a drip pan and drain residual fuel from cover (2).
Hold down the cover (2) firmly to prevent spring action and remove nuts (3) from studs (4). Gradually release pressure
on cover and remove cover from studs.
Unscrew and remove guide shaft (5) from cover (2).
Remove spring (6) from pressure control. Carefully lift diaphragm valve (10) from pressure control, taking care not to
damage diaphragm on cover mounting studs (4).
Remove nut (7) from machine screw (8).
Remove large washer (9), diaphragm (10), poppet (11), disk (12), spacer (13), and small washer (14) from machine
DIAPHRAGM VALVE CLEANING, INSPECTION AND REPAIR (Refer to figure 1.)
Wash all metal parts in a hot, mild commercially available soap and water solution. Dry parts with clean rag.
Inspect machine screw (8) and guide shaft (5) to determine if bent, cracked, broken, burred or have stripped threads.
Inspect nut (7) for stripped threads or a burred surface.
Inspect diaphragm (10) and disk (12) to determine if cut or deteriorated.
Inspect spring (6) to determine if broken or collapsed.
Inspect poppet (11), spacer (13) washers (9 and 14) and disk (12) to determine if cracked or burred.
Replace parts that are damaged or defective as authorized.