Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 190 / 468

5-24
OVERHAUL MANUAL
7 6 5 4 3 2 1
29 20
1. Pedal Push Rod 11.
Plunger Seat 21. O u tp u t Push Rod
2. Pedal Rod R etainer 12. " 0 ” Ring Seal 22.
Push Rod R etainer
3. B o o t 13. Plunger 23.
Spool Spring
4. Bracket N u t 14. Spacer 24. Plug " 0 " Ring
5.
Linkage B racket
15. Check V alve Ball
25. Spool Plug
6. Booster Cover 16. A c c u m u la to r Check Valve 26.
Snap Ring
7. Cover to Housing Seal 17. " 0 ” Ring Seal 27. Piston R e tu rn Spring
8. In p u t Rod Seals 18. Piston Seal 28.
Spring R etainer
9. In p u t Rod and Piston Assy.
19.
Booster Housing 29. Housing to Cover B olts
10. S pool Assem bly 20. Tube Seat Inserts
Fig. 5 -2E --P ow er B o o s te r C o m p o n e n ts (T y p ic a l)
11. Remove the booster assembly from the vise and while
holding the unit over a pan, separate the cover from the
housing. Remove the large seal ring from the groove in the
cover; discard the seal.
12. Remove the input rod and piston assembly, and the
spool assembly from the booster housing.
13. Remove the input rod seals from the input rod end,
and the piston seal from the piston bore in the housing;
discard the seals.
14. Remove the plunger, seat, spacer and ball from the
accum ulator valve bore in the flange of the booster housing.
Remove the "O" ring from the seat; discard the "O" ring.
15. Thread a screw extractor into the opening in the
check valve in the bottom of the accum ulator valve bore, and
remove the check valve from the bottom of the bore. Discard
the check valve and "O" ring.
NOTE:
Using a screw extractor damages the seat in the
check valve. A new charging valve kit must be installed
whenever the check valve is removed from the
accum ulator valve bore.
16. Use a 1/4" or a 5/16" spiral flute type screw
extractor to remove the tube seats from the booster ports.
Cleaning and Inspection
1. Clean all metal parts in a suitable solvent. Be careful
to avoid losing small parts.
2. Inspect the valve spool and the valve spool bore in the
booster housing for corrosion, nicks, scoring or other
damage. D iscoloration of the spool or bore, particularly in
the grooves, is not harmful and is no cause for concern.
3. If the valve spool or the valve spool bore has nicks
or scoring that can be felt with a fingernail, particularly on
the lands, the entire booster should be replaced as an
assembly.
NOTE:
The clearance between the valve spool and the
spool bore of the housing assembly is im portant. Because
of this, the valve spool and the housing assembly make
up a selective assembly (the valve spool is selected to
m atch the spool bore).
4. Inspect the input rod and piston assembly for
corrosion, nicks, scoring or excessive wear. If the piston is
damaged, the input rod and piston assembly should be
replaced.
5. Inspect the piston bore in the booster housing for
corrosion, nicks, scoring or other damage. If the bore is