Gege Blog 15.1 Cleaning of Gearbox A (f).pdf

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Wednesday January 27, 2016
The pinion trains cleaned (still with the old bearings ...). From left to right, reverse return gear and its shaft; 1st and 2nd sliding
gears on primary shaft; primary shaft (in two parts, in the centre, which had been micro-blasted and restored by Michel );
bearings, cages and bush; Train of second intermediate pinions with its shaft:

Little explanation of how this "compact" gearbox works:
The engine would be at the bottom in the photos (half splined primary shaft driven by the clutch disc).
The movement is always transmitted by the cone of the primary shaft (on the right in the following photos, made of two
interlocking parts ), unlike a traction gearbox where the drive of the differential passes through the secondary shaft.
The rear primary half-shaft (above in the photos) turns in a bronze bush on the front half-shaft. This front half shaft has a fixed
gear (with the bronze bush) always in engagement with the train of secondary (or intermediate) gears.
This fixed gear has dogs to secure the two half shafts via the (2nd and) direct drive gear..
For clarity of the photos, the reverse return gear is placed on the side (except for reverse) ,but it is always engaged on the rear
gear of the intermediate gear train.
(enlarge photos to visualize the movement path)