Cleaning And Inspection - Chevrolet 1988 Light Duty Truck Repair Manual

Figure 10— Removing or Installing the Stub Shaft
Assembly
POWER STEERING 3B3-5
• Pull the shaft assem bly until the shaft cap
clears the valve body by about 6 mm (1 /4-inch).
• Valve spool (252) and seals (230) and (231)
(figure 11).
15. Screws (210), clam p (211) and ball guide (212).
• Balls (213).
9
Im p o rta n t
• T he fo llo w in g p ro c e d u re s h o u ld
perform ed with the valve assem bly in the gear
housing.
16. Connectors (229) (figure 12).

CLEANING AND INSPECTION

Clean
All parts with solvent and blow dry.
J?
In sp ect (F ig u re 1)
1. Pitman shaft and side cover.
— Bearing. Needles should rotate freely using
finger pressure. Replace the bearing and side
cover (225) if necessary.
— Bearing surfaces in the side cover (225) for
scoring. Replace the side cover assem bly if
necessary.
— Sealing and bearing surfaces of the pitman
sh a ft (221) for roughness, nicks, or other
damage. Replace the pitman shaft assem bly if
necessary.
— P itm an shaft (221) for excessive w ear or
scoring. Check the sector gear teeth for wear.
R e p la c e th e p itm a n
necessary.
— Adjuster screw (222) threads for wear. The
adjuster screw must be free to turn with no
end play.
2. Rack piston.
— Worm (248) and rack piston (214) grooves and
all balls (213) for scoring. BOTH MUST BE
REPLACED as a matched assembly.
— Seal (216) and ring (217) for wear.
— Ball return guide halves (212) for cracks and
damaged.
— Bearing (247) and races (246) for scoring and
excessive wear.
— Rack piston (214) teeth and external ground
surfaces for scoring or excessive wear. If
either condition exists, replace the rack piston
(214) and worm (248).
3. Adjuster plug.
— Spacer (235) for wear or cracks.
— Races (236, 238) for wear or scoring.
— A djuster plug (240) threads for wear.
— Bearing (237) for wear or scoring.
— N eedle b e a rin g (241) for wear, p ittin g or
scoring. Replace if necessary.
4. Valve and stub shaft.
— Seals (231) and rings (232).
— Shaft pin for wear or cracks. If excessively
worn or broken, replace the com plete valve
and shaft assembly.
not be
s h a ft a s s e m b ly if