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3-34
GROUP 3-
SUSPENSION. STEERING. WHEELS
&
lYRES
12. Remove the sector shaft as-
sembly and worm and valve assembly.
13. Refit the sleeve to the worm
and valve assembly and position ·the
.010 service
shim
over the valve
against the end face of the sleeve.
14. Enter the worm, valve and
sleeve assembly complete with service
shim into the housing, fit the bearing
cage assembly and race and tighten
the bearing adjusting screw to force
the complete assembly against the
bearing spacer. This will ensure that
the bearing spacer is pushed further
into its bore if the stack up length of
the worm valve and sleeve assembly is
greater than its predecessor.
15. The worm valve and sleeve as-
sembly should then be withdrawn and
the service
shim
removed from the
valve.
(Note: If the stack up of new worm
valve and sleeve assembly is less than
its predecessor, additional clearance
will exist between the sleeve and the
bearing spacer, this however will not
be detrimental.)
Inlet Port Seat and Outlet Tube
1. The inlet port seat and outlet
tube can both be removed if required
by pulling out of the housing.
2. New components are fitted
using the Tool No.
XA-
374309A
for the inlet port seat and Tool No.
XA-3713A for the outlet tube.
Rack Pad Adjusting Screw and Seal
1. The rack pa,d adjusting screw
should only be removed when the
gear is stripped, to prevent any possi-
bility of the rack pad being dislodged
within the assembled gear.
2. The seal however can be re-
placed on an assembled gear, by
removing the locknut and undoing the
screw one to two turns to allow the
seal to be removed from the groove
in the screw.
3. Fit the new seal and replace
the locknut, then reset preloads.
RE-ASSEMBLY
1.
Replace the worm bearing race
in the housing together with the shims
removed (if any) or the predetermined
number of shims if a new worm,
valve and sleeve assembly
i~
to be
fitted (see page 3-33). Use the sleeve
Tool No. XA- -3589-B to seat the
bearing in the housing.
2. Replace
the
sector
shaft
bearings.
To fit a new outer (narrow) bear-
ing first fit the spacing washer Tool
No.
XA- 3576A to the assembly
mandrel Tool No.
XA-
3576A
followed by the spacer sleeve checking
that the spigot on the spacing washer
Fig. 50
Installing Sector Shaft Bearing
Fig. 51
Installing Input Shaft Seal
is adjacent to the sleeve. Next fit the
bearing onto the mandrel and insert
assembly through the top aperture of
the housing. Start the bearing into
the bore and fit the guide Tool No.
XA- 3576-A2 for the mandrel to
the top aperture of the housing. Press
the bearing fully home under a rack
or hydraulic press. Withdraw the
mandrel
·
from the bearing, remove
the guide from the top
aperture·
and
remove the bearing spacer washer and
sleeve.
To fit a new inner (wide) bearing,
first fit the spacing washer to the
mandrel followed by the bearing.
Ensure that the spigot on the spacing
washer is adjacent to the bearing (this
will ensure that the bearing is slightly
below the thrust face inside the
housing when pushed home). Press
the bearing fully home. Withdraw the
mandrel from the
bearing..
remove
the guide from the top aperture and
remove the spacer washer.
Reassembly of the sector shaft
seal, backing ring, circlip and dust seat
is carried out after refitment of the
sector shaft.
3. Fit a new input shaft seal to
the Tool No. XA- 3525A. Enter the
mandrel through the bearing adjusting
screw bore and knock the seal in,
checking first that the seal is fitted
with the pressure sealing lip towards
the inside of the housing and the
dust sealing lip to the outside.
The seal is best fitted with the in·
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