Fiat 411 R Service Manual page 9

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Fig. 95. - Upper view of gearbox control gears and shifter
forks.
1. Shifter forks for 1st, 4th gears and reverse - 2. Epicyclic
reduction gear control fork - 3. Shili fork controlling 2nd and
5th, 3rd and Sih gears.
Primary shalt.
Reverse gear and its shaft.
Secondary shaft.
-04-.
Fig. 96. - Disassembly of primary shaft.
(Arrows show the wooden wedge and lhe punch).
Note. - When also {he secondary shaft is to be
disassembled, engage lwo gears in order to unscrew
the fronf end fasrfening nut.
Take away the primary shaft front cover and remove
the shafé by hammering on rear end.
Prevenl the rear bearing from coming off together
with the shaft by placing a w0oo'en wedge as shown
in Fig. 98.
lf necessary pull out the hearing also using punch
A 9613703.
Remove the slop and slide out the shaft together
wifh ihe gear.
Should fhe shall' removal offer some dlfiiculty, apply
a screw to the threaded hole in the axle.
Remove bush from gear using the punch A 928251.
Remove ihe epicycllc reducllon unit and fhe gearbox
wall lnner thrust disc;
slide out the secondary shafl with a bronze punch
hammering ll on its front end.
Checking the stripped out components of the gearbox and epicyclic reduction gear.
Check gearbox and eplcycllc reduction gear components against specifications of page 63.
Neither gear teeth nor chamfered surfaces should he damaged.
Check if the teeth of mating gears are working on the whole face length, and if the surfaces are smooth
and free from signs of scoring or hammering.
The sliding gear hub internal splines should be free from marks 0% wear or seizing, and ali splines should
have their corners without signs of hammering.
The splined primary shaft should be absolutely free from pitting or scoring. especially on gear sliding sur-
faces. Slide the gears on the shaft and check for clearance between the gear guide flanks and the cor-
responding shaft spline flanks.
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