Installing The Balls Into The Rack Piston; Retaining The Balls In The Ball Guide; Assembly - Chevrolet 1991 Light Duty Truck Repair Manual

3B3-6 POWER STEERIN G
• Valve spool inside the valve body (250). The
valve spool, when lubricated with steering fluid,
must rotate without binding. If binding occurs,
replace the complete valve and shaft assembly.

ASSEMBLY

Install or Connect (Figures 1, 4, and 10
E
through 16)
Tools Required:
J 4245 Snap Ring Pliers
J 6217 Valve Connector
J 21552 Ball Retainer
J 22407 Bearing Installer
J 8092 Bearing Driver
J 7079 Bearing Remover and Installer
J 8524-1 Driver
J 7624 Bearing Preload Spanner Wrench
NOTICE: When installing balls in rack piston,
the black balls are smaller than the silver and
MUST BE INSTALLED ALTERNATELY WITH SIL­
VER BALLS to maintain rack piston to worm
gear preload. If balls have worn to one color
replace them.
NOTICE: For steps 4, 16 see "Notice" on page
3B3-1 of this section.
1. Balls (213), alternately by color, in the rack piston
(214) (figure 13). Use J 21552 in the rack piston.
• Lubricate the 24 balls with power steering fluid.
214
211 212
A. Install Balls in This Hole Slowly
Rotating Worm Counterclockwise
210. Screw
211. Clamp
212. Ball Guides (Left Half)
213. Ball Guides (Right Half)
213. Balls
214. Rack Piston
248. Worm Shaft
Figure 13—Installing the Balls into the Rack Piston
Figure 14—Retaining the Balls in the Ball Guide
248
2. Balls (213), alternating by color, in the ball guide
3. Place second half of ball guide over balls. Check
213
4. Ball guide assembly (211, 212), clamp (210) and
5. Stub shaft (251) into the valve body (250) (figure
210
6
209
7. Valve assembly (250), seal (249), wormshaft (248),
F9270
From Hole in Spool Valve
Adjuster Plug
(212) (figure 14).
• Retain the balls in the guide with petroleum
jelly.
that halves are mated properly to insure free
movement of balls once installed.
screws (209) to the rack piston (214).
11).
. Valve spool (252) and seals (230, 231) into the
valve body (250).
• Lubricate the valve spool (252) and seals (230,
231) with power steering fluid before assem­
bling.
| Important
• When assembling gear make sure angle of
thrust bearing races are correct in relation to
the worm shaft assembly.
thrust bearing races (246) with roller bearing (247)
between races (Figure 9).
• Lubricate seals with power steering fliud.