GMC T Series 1994 Repair Manual page 81

3. Rack piston plug (27).
• Insert J 21552 into bore of rack piston (26).
Hold J 21552 tightly against worm shaft
while turning the stub shaft counterclockwise.
• The rack piston (26) will be forced onto
J 21552 and hold the rack piston balls (25) in
place.
4. Rack piston (26), rack piston balls (25), and J 21552
together from housing (20).
5. Valve. Refer to "Valve Replacement" in this sec­
tion.
6. Worm shaft (13).
7. Thrust bearing (16) and races (15 and 17).
8. J 21552 from rack piston (26).
9. Rack piston balls (25).
10. Screws (21), clamp (22) and ball guide (23).
11. Teflon ring (5).
12. O-ring seal (6).
Clean
• All disassembled parts.
• | Inspect
• All disassembled parts for wear. Replace if
necessary.
*
Assemble
O-ring seal (6) and teflon ring (5) and lubricate with
1
power steering fluid.
Worm shaft (13) to rack piston (26) outside of
housing (20).
• Fully seat worm shaft (13) to rack piston (26)
and align worm shaft spiral groove with rack
piston ball return guide hole (see Figure 20).
9
Important
• Make sure that all rack piston balls (25) are
reinstalled in the rack piston. Improper rack
piston ball installation may result in personal
injury.
Notice:
The black rack piston balls are smaller than the
silver balls. The black and silver balls must be installed
alternately into the rack piston and ball guide to maintain
rack piston to worm shaft preload.
• Lubricate rack piston balls (25) with power
steering fluid.
3. Rack piston balls (25) to rack piston (26) by
inserting through ball return guide hole while
turning worm shaft (13) counterclockwise.
4. Remaining rack piston balls (25) to ball guide (23)
using grease at each end to retain balls (25)
(see Figure 21).
5. Ball guide (23) to rack piston (26).
Notice:
See "Notice" on page 3B1A-1 of this section.
6. Ball guide clamp (22) and screws (21).
S Tighten
• Screws (21) to 58 N*m (43 lb. in.).
• Insert J 21552 into bore of rack piston
(26) while turning worm shaft (13)
counterclockwise. The rack piston (26) will
be forced onto J 21552 and will hold the rack
piston balls (25) in place.
7. Races (15 and 17) and thrust bearing (16) to worm
shaft (13) (see Figure 22).
8. Worm shaft (13) to housing (20).
9. Valve. Refer to "Valve Replacement" in this
section.