Roller Tooth Cross Section; Longitudinal Section Of Roller Tooth Shaft - Fiat 411 R Service Manual

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The lower taper rolier bearing outer races and
shims (S, Fig. 122).
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To avoid eitering the setting of roiier and worm
gear, the shim pack S thickness shouid be varied if
the worm gear, the roller or the steering box have
been replaced; the shims pack should the/7 be
adjusted as foiiows:
a) mount the worm gear assembly, after smearing
it with red lead compound, and adjust rj'/f,-'&(3_r;§Q
of taper roller taearings;
b) mount the roller, shaft, cover and the steering
arm;
C} adjust theroiier and worm gear bearing afiggfds
ing to indications following.
Note. - Each variation of shims S, calls for a
new adjustment of bearings with shims T.
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Fig. 122. - Roller tooth cross~sectinn. Fig. 123. - Longitudinal section of rolier tooth shaft.
R = Rc-Her washers - S = Shims centering screw to roifer - E; Gg and Gp = Sears - Vr : Adjusting sci-9W_
T = Centering shims taper 'nearing adjusting shims.
The worm gear, with the taper roiier bearing act-
justingshims (T, Fig. 122).
The roller shaft, the cover and the steering arm.
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Adiustment of rofier and worm gear bearing.
Mount the worm gear shaft with its bearing shims
and check it for flee rotation which must be ac-
complished without excessive effort.
The correct functioning of the mechanism requires
that the distance between roiier and worm gear be
as sm aii as possible and corresponding to the original
specifications.
To this end, after mounting the unit and positioned
the steering arm as in Fig. 122(this corresponding to
straight forward motion of the tractor) the adjusting
screw (Vr, Fig. 123) should be screwed on, in order
to take up the piay between roiier and worm screw;
in addition, check that this condition remains un-
varied as the steering wheel is turned 30°, ieft and
right.
After adjustment, tighten the lock nut of screw E/r.
To refit the guide box assembly to tractor reverse the dismantling procedure.
After assembly, service the guide box with SAE 90 oi! and the drag link grease nippie with chassis grease.
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