Primary Rack Piston - GMC T Series 1994 Repair Manual

PRIMARY RACK PISTON

Figure 1 and 29
Tool Required:
J 21552 Rack Pinion Arbor
Inspect
Worm (33) and rack piston (50) grooves and all balls
(49) for scoring. Replace as a matched assembly.
2 Seal (9) and ring (10) for wear.
.
Ball return guide halves (46) for cracks and damage.
3.
Bearing (35) and races (34) for scoring and exces­
4.
sive wear.
Rack piston (50) teeth and external ground surfaces
5.
for scoring or excessive wear. If condition exists,
replace the rack piston (50) and worm (33).
Assemble
*
New Seal (9) and ring (10) to rack piston (50).
1.
• Lubricate new seal (9) and ring (10) with
power steering fluid.
A-INSTALL BALLS IN THIS
HOLE WHILE SLOWLY
ROTATING WORM
COUNTERCLOCKWISE
B-WORM FLANGE
4 6 -GUIDE, BALL
RETURN
47 - CLAMP
4 8 -SCREWS
49 - BALLS
Figure 27 Placing Balls in the Ball Return Guide
33-SHAFT, WORM
50 - PISTON, (RH) PRIMARY RACK