GMC S Series 1994, Repair Manual

Page: 295 / 919

SECTION 5D2
HYDRAULIC BOOSTER
NOTICE: When fasteners are removed, always reinstall them at the same location from which they were
removed. If a fastener needs to be replaced, use the correct part number fastener for that application. If
the correct part number fastener is not available, a fastener of equal size and strength (or stronger) may
be used. Fasteners that are not reused and those requiring thread locking compound will be called out.
The correct torque value m ust be used when installing fasteners that require it. If the above conditions
are not followed, parts or system damage could result
CONTENTS
SUBJECT PAGE
General D escription........................................................................................................................................................ 5D2-1
Unit R e p a ir........................................................................................................................................................................ 5D2-1
Booster A ssem b ly....................................................................................................................................................... 5D2-1
Gaging Procedure........................................................................................................................................................ 5D2-4
Power Steering P u m p ................................................................................................................................................ 5D2-4
S p ecificatio n s................................................................................................................................................................... 5D2-4
Fastener Tightening Specifications........................................................................................................................ 5D2-4
Special T o o ls .................................................................................................................................................................... 5D2-5
GENERAL DESCRIPTION
The Bendix booster uses fluid pressure from the pow- serves as the mounting surface for the master cylinder,
er steering pump to provide the power assist. The Identifying information is stamped into the housing
booster assembly is located on the left front cowl and near the inlet valve.
UNIT REPAIR
BOOSTER ASSEMBLY
CAUTION: The accum ulator contains com ­
pressed gas. Always use the proper tools
and follow the recommended procedures or
personal injury may result. Do not apply heat
to accumulator. Do not attempt to repair an
inoperative accumulator. Always replace an
inoperative accumulator with a new one. Dis­
pose of an inoperative accumulator by drill­
ing a 1/16-inch diameter hole through the end
of the accumulator can opposite the O-ring.
Remove or Disconnect (Figures 1 through 5)
Tool Required:
J 26889 Accumulator Piston Compressor
1. Place J 26889 over end of accumulator and install
a nut on stud (figure 2).
2. Depress accumulator with a C-clamp.
3. Insert a punch in hole on housing.
4. Retainer (1).
5. Release C-clamp.
6. Nut from stud.
7. Special tool J 26889.
8. Accumulator (2) and O-ring seal (3).
9. Retainer (4) (figure 3).
10. Plug (5) and O-ring seal (6).
11. Spring (7).
12. Retainer (26).
13. Output pushrod (28) and baffle (27).
14. Piston return spring (25) and retainer (24).
• Saw eyelet off pedal rod (20).
15. Boot (19).
16. Nut (18) and bracket (17).
17. Bolts (9).
18. Separate cover (16) from housing (8).
19. Seals (14 and 15).
20. Piston assembly (22) and seal (23).
21. Spool valve (13).
22. Accumulator valve (11).
• Make a wire hook to aid in the removal (figure
4).