3-66. RELAY VALVE MAINTENANCE (MODEL WPES-1) - continued.
Using mild soapy water, wash all parts.
Using clean, lint-free rags, wipe all parts dry.
Inspect springs for deformity
Inspect exhaust diaphragm, relay piston, exhaust cover, body, cover, adapter, and inlet and exhaust valve
for corrosion, cracks, excessive wear, or damaged threads.
Replace defective components as required.
Install adapter (3) and filter in body (2).
Install new o-rings (1 and 25) on piston assembly (27).
Install exhaust valve seat (26) in piston assembly (27).
Install piston assembly (27) in body (2).
Install new sealing ring (28) in body (2) and install cover (29), part number plate (30), flat washer (31), and
cap screws (32) on body (2).
Position check valve ball (23) and compression spring ( 22) in body (2).
Install new o-ring (10) in valve guide (11).
Install new O-ring (14) in emergency piston (6).
Install valve retainer (8), valve spring (9), and valve guide (11) on inlet and exhaust valve (7)
Position inlet and exhaust valve assembly (24) in emergency piston (6) and install retaining ring (12).
Position new O-ring (4), piston and valve assembly (5), and emergency spring (13) in body (2).
Install new preformed packing (21) on exhaust cover (15).
Position exhaust cover (15) on emergency spring (13) and compression spring (22).