Chevrolet 30 Series 1967 Service Manual page 268

BRAKES 5-54
filters exhaust stem,
obstructed.
4. Check springs for cracks, distortion, or corrosion.
5. Replace all parts not considered serviceable during
these inspections.
Assembly
NOTE: P rior to assembly lubricate the lower
body bore, the top of the piston, the piston
grooves, piston grommets, piston setting spring
guide and adjusting screw.
1. Install the exhaust stem grommet in its groove in
the stem bore of the piston.
2. Drop the inlet and exhaust valve into place at the
bottom of the piston.
3. Install the inlet valve spring with its narrow end
against the valve. P ress the spring down until the
large coiled end snaps into the groove inside the
piston.
4. Position the exhaust stem spring over the exhaust
stem. Then carefully press the stem into the stem
bore of the piston.
5. Install the piston in the body.
. Install one lower spring seat, spring guide, the other
6
lower spring seat, pressure setting spring, and the
hex-shaped upper spring seat on the adjusting screw,
in that order.
7. Screw the upper spring seat down until the dimension
from the top of the seat to the bottom of the stem
head is approximately 1 -7 /8 ". Secure with lock nut.
NOTE: Before placing the adjusting screw and
stem assembly in the governor body, check to
be sure the exhaust stem and its spring are in
place in the piston.
Installation
1. Clean or replace both air lines connected to the
governor.
2. Mount governor in place with exhaust port pointing
toward the ground.
3. Connect air lines to governor.
4. Test governor for proper operation.
1. Screw
2. Retainer
3. Diaphragm
4. Ring
5. Exhaust V a lv e Body
and the pistons are not
Fig. 85—A ir Brake Control V a lv e
6. Seal
7. Spring
8. Seal
9. V a lv e
10. V a lv e Body
FOOT OPERATED AIR BRAKE CONTROL VALVE
Removal
1. Exhaust all air from system.
2. Remove all lines running to brake valve.
3. Remove pedal push rod clevis pin.
4. Remove mounting bolts and remove valve.
Disassembly (Fig. 85)
1. Remove boot (18) from plunger (17) and bracket (16).
2. Remove plunger (17).
3. Remove mounting bracket (16) from valve body (10),
by removing 3 bolts (19) and lock washers (20).
4. Remove snap ring (15).
5. Remove piston assembly (14) and spring (11) from
valve body ( ).
1 0
. Remove two seals (12 and 13) from piston assembly
6
(14).
7. Invert valve body.
. Remove screw (1), retainer (2), and diaphragm (3)
8
from exhaust valve body (5).
9. Remove ring (4) from exhaust valve body (5).
10. Remove exhaust valve body (5), seal (
and valve (9) from valve body (10).
11. Remove seal ( ) from valve (9).
8
Cleaning and Inspection
1. Check mounting flange for cracks or breakage.
2. Discard all rubber parts.
3. Inspect the body for scoring and excessive wear. Be
sure all passages are clear.
4. Wash all metal parts in non-toxic cleaning solvent
and dry with air.
5. Replace all parts found damaged or worn.
Assembly (Fig. 85)
NOTE: Lubricate all
grease.
1. Place seal ( ) on valve (9) and place in valve body
8
(10).
2. Install spring (7) on valve (9).
3. Place seal ( ) on exhaust valve body (5) and install
6
assembly in valve body (
(V.
11. Spring
12. Seal
13. Seal
14. Piston Assembly
15. Snap Ring
), spring (7),
6
seals with Lubriplate
) piloting on coil spring
1 0
16. M ounting Bracket
17. Plunger
18. Boot
19. Bolt
20. Lockwasher
CHEVROLET TRUCK SERVICE M ANUAL