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7
Maintenance
Disassembly of Relay Valve
1. Remove screws (1). Remove cover (2) and
diaphragm (3).
2.
WARNING: Bottom cover (18) is spring-loaded.
Clamp relay valve in arbor press before removing
bottom screws (19). Otherwise personal injury or
damage to parts may occur.
Secure relay valve upside
down in arbor press, applying force to bottom cover.
3. Remove screws (19). Slowly raise arbor press to remove
cover (18).
4. To remove stem piston assembly: Hold diaphragm
support (4) with a spanner wrench. Turn locknut (15) with
a socket to unscrew the stem from the diaphragm
support.
5. If the locknut comes loose before the diaphragm support,
separate the piston (13), plate (12) and stem (5). Hold the
stem on the flats and unscrew the diaphragm support.
Assembly of Relay Valve
Apply Parker O-Lube grease to O-rings (11), (14), and (17),
and spring (16).
Clean with isopropyl alcohol and apply Loctite® 242 or 243 to
screws (1), screws (19), and diaphragm support (4).
1. Insert stem (5) of stem/piston assembly through ring (10)
and O-ring (11) in housing (6).
2. Tighten diaphragm support (4) on stem piston assembly
to 7.9/6.7 Nm (70/60 inch-Lbs) by holding locknut (15).
3.
WARNING: Bottom cover (18) is spring-loaded.
Clamp relay valve in arbor press before installing
bottom screws (19). Otherwise personal injury or
damage to parts may occur.
Secure relay valve upside
down in arbor press. Align bottom cover and apply force
to bottom cover.
4. Install eight screws (19). Tighten to 30/26 Nm
(270/230 inch-Lbs).
5. Install diaphragm (3) and cover (2).
6. Install twelve screws (1). Tighten to 25/20 Nm
(220/180 inch-Lbs).