Pontiac FIREBIRD 1972 Service Manual page 1165

9-12 1972 PONTIAC SERVICE MANUAL
SIDE COVER ,ADJUSTING SCREW
Fig. 9-8 Cross Section Through Pitman Shaft
PITMAN SHAFT SECTOR
RACK PISTON
CONSTANT RATIO VARIABLE RATIO
Fig. 9-9 Pitman Shaft Sector Teeth
The gear incorporates the recirculating ball system in
which steel balls act as a rolling thread between the steer-
ing wormshaft and rack-piston. The rack-piston nut is
geared to the sector of the pitman shaft. Lash between the
pitman shaft and rack-piston nut is maintained by an
adjusting screw which is retained in the end of the pitman
shaft gear. The rotary valve is contained in the gear hous-
ing thus eliminating the need for separately mounted valve
and cylinder assemblies.
,
SPACER (SNAP1 RING
I
P I T M A N SHAFT
/
PLASTIC SEALS
N E E D L E B E A R I N G S
Fig. 9-10 Sectional View of Power Steering Gear