Chevrolet 30 Series 1967 Service Manual page 265

RESERVOIR PORT
TYPE R-1C
THROUGH M O U N T IN G FLA N G E
FOR TYPE R-1
BLEEDER P A S S A G E FILTER
BLEEDER P A S S A G E GRO M M ET
DIA PH RA GM
G U ID E
GRO M M ET
SUPPLY VALVE
SEAT GRO M M ET
SUPPLY VALVE
SEAT
SUPPLY VALVE
SEAT RETAINER
SPRIN G
SUPPLY VALVE
SP R IN G
SUPPLY VALVE
CAP NUT
Fig. 79—Relay V a lv e
Removal
1. Block or hold vehicle by a means other than air
brakes.
2. Open drain cocks and exhaust air pressure from air
brake system.
3. Disconnect air lines from relay valve.
4. Remove mounting bolts and remove relay valve.
Disassembly
1. Remove actuator adapter and its gasket.
2. Remove cover, diaphragm, diaphragm ring, bleeder
passage grommet, and bleeder passage filter.
3. Remove diaphragm guide and grommet.
4. Remove supply valve cap nut and grommet.
5. Remove supply valve spring, seat retainer spring,
supply valve, supply valve seat, and supply valve seat
grommet.
. Remove exhaust strainer.
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Cleaning and Inspection of Parts
1. Wash all metal parts in a cleaning solvent such as
alcohol or kerosene and dry them thoroughly. Keep
parts submerged in solvent for shortest possible
time to avoid damage to m aterials.
2. Inspect all moving parts for wear or damage and
bores for out of round condition.
3. Inspect diaphragm and bonded rubber valve for wear
or deterioration.
BRAKE VALVE PORT
ACTUATOR
PORTS
COVER
DIAPH RAGM
DIAPHRAGM R IN G
COVER
G A SKET
ACTUATOR
ADAPTER
GRO M M ET EXHAUST PORT
_______________ STRAINER
4. Inspect spring for breaks or deterioration.
5. Inspect valve seats for nicks or burrs.
. Inspect bleeder passage in body, diaphragm ring and
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cover and clear any restrictions noted.
7. Clean or replace strainer and filter elements.
. Replace any parts which are no longer serviceable
8
by these inspections.
Assembly
Prior to assembly, lubricate lightly the following sur­
faces with Lubriplate or equivalent.
a. All grommets.
b. Diaphragm guide bore of relay valve.
c. Outside diameter and supply valve sterii bore of
diaphragm guide.
d. Supply valve seat bore of relay valve body.
1. Install exhaust port strainer. Be sure retaining ring
is firmly seated in its groove.
2. Install supply valve seat grommet and supply valve
seat. Note that seat is firmly seated on shoulder in
body.
3. Install supply valve, supply valve spring and seat
retainer spring.
4. Install grommet on supply valve cap nut.
5. Install and tighten the supply valve cap nut.
. Turn body over.
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7. Place grommet on diaphragm guide and install guide
in relay valve body. Note that guide is neat sliding
fit in body bore and on supply valve stem.
. Install bleeder passage grommet in body.
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9. Install diaphragm ring.
10. Install relay diaphragm.
11. Install bleeder passage filter in cover and position
cover on body.
NOTE:
Bleeder passage openings in body, dia­
phragm ring, diaphragm, and cover must line up.
12. Install lock washers and cap screws and tighten
them evenly and securely.
13. Install gasket and actuator adapter.
14. Tighten cap screws evenly and securely.
Installation
1. Clean or replace lines to relay valve.
2. Mount relay valve securely.
SP R IN G
INLET
PORT
DIA PH RA GM
PRESSURE
PLATE
INLET
PORT
CLAMP R IN G
NUTS A N D
BOLTS
CLAMP
R IN G
Fig . 80—A ir Brake Chamber (Clamp Ring Type)
BRAKES 5-51
N O N PRESSURE
PLATE
M O U N T IN G BOLTS
PUSH ROD YO KE
A SSY.
CHEVROLET TRUCK SERVICE M ANUAL