Chevrolet 70 1969 Series, Руководство по ремонту

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POWER BRAKE 5-10
Yoke
Cotter Pin
Lock Nut
Splash Guard
Boot
Push Rod
Cap Screw
Retainer Ring
Lock Cap
Roller Spring
Spring Seat Washer
Roller
Collar
Piston
Piston Grommet
1 Auxiliary Pressure Plate
2 Auxiliary Clamp Ring
3 Clamp Bolt Nut
4 Clamp Bolt
5 Auxiliary Diaphragm
6 Service Pressure Plate
7 Service Clamp Ring
Service Diaphragm
Figure 5 — D D 3 Brake A ctu ato r (C h a m b e r ) C o m p o n e n ts
10. N ext cautiously apply air at the locking port to ass­
ist in removal of collar and piston, and to remove pis­
ton grom m et.
1 1. Inspect bearing in shaft bore of non-pressure plate
and remove it only if it is showing signs of wear and
is to be replaced.
12. The push rod should not be removed from the shaft
unless it is dam aged. If the rod is removed it m ust be
replaced. To remove the rod, place a heavy washer
over the rod against the shaft, then position a spacer
and second w asher over the rod and beneath the yoke
lock nut(s). T urn the lock nut(s) down with a long
handled wrench, pulling the push rod from the shaft.
13. The knurled T-bolts in the non-pressure plate can be
removed and replaced if dam aged.
CLEANING AND INSPECTION
W ash all m etal parts in a good cleaning solvent. Dry
thoroughly. Any reusable rubber parts should be wiped
clean. Discard felt breather. Inspect all parts for excessive
wear or deterioration. Particular attention should be given
to the piston and collar bores in the plate. Also, the air
passage from the lock part to piston bore should be clean
and not restricted. It m ay be necessary to remove the in­
spection plug to thoroughly clean this passage.
Rollers should be checked carefully and all replaced if
one or m ore need replacing. C heck springs for cracks, dis­
tortion or corrosion.
Replace all parts not considered serviceable during
these inspections, especially rubber parts.
ASSEMBLY
1. On assembly, line up parts as they were m arked prior
to disassembly.
2. If the bearing in the non-pressure plate was removed
it should be reinstalled or replaced.
3. Lubricate piston and collar bores, shaft, piston gro m ­
met, piston and roller cavity with a barium base
grease (or equivalent).
4. Position piston grom m et in piston bore. Then piston,
with sm ooth end down, against the grom m et.
5. Place collar in its bore in plate.
6. Position all eight (8) rollers in groove formed by top
of piston and collar ram p.
7. Place roller spring seat washer on top of rollers.
8. Position cone shaped roller spring on washer with
small end to washer.
9. Position cap on roller spring. Press cap down and
hold while installing cap screws evenly and securely.
10. Turn over non-pressure plate with lock mechanism
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L