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J-32
GROUP 3-
SUSPENSION, STEERING, WHEELS
&
TYRES
ping it over the valve, drive pin end
flrst, until it is about to enter the
coupling sleeve. Care should be taken
in this operation not to damage
either the bore of the sleeve or the
outside diameter of the valve, as a
very flne working clearance of .0002
- .0006 inch on diameter is held.
Before entering the sleeve into the
coupling sleeve flt the wedge Tool
No. XA- 3771A behind the coup-
ling sleeve (Fig. 47) between coupling
sleeve and bearing cage, to ensure
that the coupling sleeve is held furnly
against its retaining ring. Check that
the fail safe and coupling spring is
concentric in the bore of the worm,
with the leg of the spring in the
drive slot and the spring rotated
clockwise (as viewed) to position the
leg against the side of the slot (Fig.
48) .
.
Line up the drive pin of the
sleeve with the gap between the leg
of the spring and the opposite side of
the slot and "feel" the sleeve into the
coupling sleeve until the pin engages
with the
slot.
To fully engage the
sleeve, the worm, valve and sleeve
assembly should be held vertically
with worm to the bottom and struck
sharply downwards onto a fum block
of wood, ensuring that the sleeve is
being held at the instant of impact
to drive it fully home against the end
of the worm.
It is important that the pin is fumly
held in the drive slot ofthe worm by
the spring
2
s this spring ensures that
no slack can develop between the
worm and sleeve, otherwise the steer-
ing
gear will not function smoothly.
After assembly, freedom from slack
in this coupling should be confumed
by lightly gripping the worm in a
copper-jawed vice and feeling the
sleeve for rotational slack in either
direction.
B.
Valve, Coupling Sleeve and Ball
Cage Assembly
Further dis-assembly of the worm
valve and sleeve assembly necessitates
un-pinning of the valve. Before un-
pinning the valve, fust remove the
sleeve as described above and mark
the relative position of valve and
torsion bar to prevent any possibility
of the valve being refltted 1800 out
of position.
1. Support the end of the valve
over an opening slightly larger than
the pin diameter (5/32") and using a
pin punch drive the pin completely
out of valve and torsion bar.
2. Pull the valve off over the tor-
sion bar. The tapered Delrin split-
bush, flat washer and conical spring
will now be loose on the torsion bar
Fig.
46
Sleeve
in
Contractor
-
Tool No.
XA-3589-8
Fig.
47
Tool No.
XA-3771-A
in Place on Worm
Fig.
48
Fail Safe
&
Coupling
Spring Location
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