Examine springs, snap ring, retainer, washers and
screws. Parts should be free of distortion and corrosion.
Replace parts that show any defects.
It is recommended that all rubber parts be replaced with
Lubricate O-rings, valve seals, O-ring sealing surfaces
and bearing surfaces of piston, valve body and
Install exhaust port diaphragm, washer and
screw to exhaust valve body. Tighten screw 1.7
- 2.3 N.m (15-20 in lbs) torque.
Install inlet valve seal and O-ring on modulation
tube. Place seal retainer over tube and around
Carefully place modulation tube assembly into
valve body so that inlet valve seal rests on body
Install exhaust valve spring over tube to rest on
Position exhaust valve body O-ring over body.
Align exhaust valve body to spring, push body
into relay valve body firmly and hold to prevent
spring from pushing exhaust body out.
Install washer and retaining ring into valve body
Position exhaust valve seal on piston (refer to
Fig. 2 for proper position of valve faces).
Install capscrew in piston and tighten to 4.9 - 6.0
N.m (43-53 in lbs) torque.
Install one O-ring on piston and the other in
Position piston assembly in cover.
It is not required that piston spring be reinstalled
in valve body. Align piston, cover and spring.
Push both piston and cover into valve body;
install four capscrews and tighten to 12 - 17 N.m
(110-160 in lbs) torque.
CTS-4079 - CHAPTER VI - Page 4