Hummer H1 Service Manual page 517

8-26 Steering System
Rack Piston Removal and Disassembly
1. Rotate stub shaft counterclockwise until rack piston is
even with seal groove in open end of housing. Do not
allow the rack piston to extend out of the housing. It only
needs to be about 1/4 inch from the end.
2. Remove rack piston plug (Figure 8-39). Use a ratchet and
socket extension to remove the plug as shown.
EXTENSION
RATCHET
RACK
PISTON
Figure 8-39: Rack Piston Plug Removal
3. Insert arbor tool J–21552 into rack piston (Figure 8-40).
RACK PISTON
ARBOR TOOL
J–21552
Figure 8-40: Rack Piston Removal
4. Hold arbor tool tightly in rack piston and turn stub shaft
counterclockwise to push rack piston out of housing. Then
remove rack piston, and arbor tool as assembly
(Figure 8-40).
5. Remove wormshaft if it came out of stub shaft
(Figure 8-41).
4-1-00
__________________________________________________________
PISTON
PLUG
ARBOR TOOL
J–21552
Figure 8-41: Wormshaft Removal
6. Remove thrust bearing and races from wormshaft.
7. Remove teflon seal rings and backup O-rings from rack
piston (Figure 8-42).
BALL GUIDES
RACK
PISTON
TEFLON
RING
O-RING
Figure 8-42: Rack Piston Components
8. Remove bolts attaching recirculating ball guide halves to
rack piston, remove guides, and remove bearings from
rack piston (Figure 8-41). A total of 24 bearings are used;
12 chrome and 12 black.
WORMSHAFT
RACK PISTON
BALL
GUIDE
CLAMP
BEARING
BALLS
SEAL
®