Fiat 411 R Service Manual page 10

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Fig. 9'1. - Gearbox and epicyciic reduction gear parts.
62
1. Clutch~ge-arbox coupling - 2. Cover gasket - 3. Primafy shaft from
bearing - 4. 1st speed and 4th speed gear ~ S. 2nd and 5th, 3rd and 5th
'~ ff 1
speed gears ~ 6. Primary shaft rear bearing - 7. Reverse gear mounted Q 1 ...;._;,;
on its shaft - B. Secondary shaft bearing retainer ring - Q. Secondary '"" 'l §i:.,_W.;;..,c%-: __
shat? front bearing - 19. 1st and 4th speed driven gear - 1?. Srd and 20 J ir 5;=e?;i;"~:
6th speed and reverse driven gear - 12. 2nd and 5th speed driven gear -
13. Secondary she'll rear bearing - 14. Thrust ring -15. Epicyclic reduc- e__
lion fixed gear - 16. Thrust outer plate - 17. Epicyciic reduction driven ®/
gears -18. Shim rings -19. Reduction gear engagement sleeve- 20. Driver. j
gear shims - 21. Stop ring for pivots - 22. Driven gear axle rollers. i
Note: Starting from chassis No. #27935 helical teeth have been super-
seded by straight teeth.
The reverse shaft should be smooth and without scoring; it the permissible clearance between the hush
titted on the gear and its shaft is in excess of the wear limits, replace both bush and shah.
The bail bearings should be perfectly smooth in operation, without clatter. The epicyclical reduction
driven gears roller bearings and those for the bevel pinion shaft should have an assembly clearance not
exceeding the value listed at page 63 and the surfaces mating such components should not be damaged
in any way.
The gear control forks should be checked for deformation and hardening characteristics of the working
surfaces. They should slide freely with shifter rods in the box guide holes.
Replace gaskets whenever worn or damaged.
The epicyclicai reduction gear thrust rings should be checked and it presenting signs of wear should be
replaced.
At gearbox major overhaul, remove the control lever sector plate, located under the cover (Fig. 98), in
order to check its components efficiency, especially the ratchet (3) and the control lever dowels £1},
which are subject to wear.
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Fig. 93. - Gear shift lever. Fig. 99. - Assembling of epicyclic reducfion gear on
gearbox secondary shaft.
1. Control lever doweis - 2. Sector plate fastening screws - 6. Primary shaft rear bearing - 14. Shim _ R = Reverse Bea,-
3. Gear selector pivot ratchet. shaft » V = Shim pin,
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