184000308 - INTRODUCTION - MANUAL GEARBOX AND DIFFERENTIAL

CONSTRUCTION FEATURES

The structure of the gearbox consists of:

• a gearbox casing which contains and supports the main and layshafts, gear selector forks and shafts and the gear selector and engagement device;
• a rear cover which contains the 5^th speed gears and the rear bearing retaining plate for the main and layshafts
• a bell housing which contains the clutch, the thrust bearing and the control linkage.

Main shaft

The main shaft consists of:

• 1^st , 2^nd and reverse gears fitted directly on the shaft;
• 3^rd , 4^th and 5^th speed gears fitted on the shaft.

The main shaft is supported by means of two ball bearings for the C.510 gearbox, whilst the C.514 version has a front roller bearing and a rear ball bearing.

Layshaft

The layshaft consists of:

• 1^st , 2^nd , 3^rd , 4^th and 5^th gears fitted on the shaft

The layshaft is supported on:

• a front roller bearing
• a rear ball bearing

Gears

The gears are the following type:

• helical toothed for the forward speeds
• straight toothed for reverse.

Synchronizers

The synchronizers for the forward speeds are the Borg-Warner type.The arrangement for the synchronizers is the split type because the synchronizers for the 1^st and 2nd speeds are fitted on the layshaft, whilst those for the 3^rd, 4^th and 5^th speeds are on the main shaft.This solution reduces gearbox noise in neutral from the moment 3 of the 5 (or 6) pairs of gears are not driven.In addition, the engagement and synchronization loads are reduced as a result of the corresponding reduction in the inert masses rotating downstream of the crankshaft.

Differential

On the C.510 and C.514 gearboxes, the differential unt is located at the rear of the gearbox casing.

It consists of:

• a crown wheel and pinion reduction
• a differential housing constructed in a single piece which includes the planet and satellite gears.

The differential is supported by two conical roller bearings.- The planet gears have a splined profile with which the two flanged couplings connected to the two driveshafts which transmit the power to the wheels mesh.The drive gear for the speedometer is fitted on the outside of the differential housing.1, Thrust bearing2, Speedometer gear3, Planet gears4, Conical roller bearing5, Satellite gears6, Ring gear7, Conical roller bearing8, Differential housing bearing adjustment shim9, Layshaft10, Main shaft.1, Thrust bearing2, Main shaft3, Satellite gears4, Planet gears5, Ring gear6, 1^st speed driven gear.7, 2^nd speed driven gear.8, Gearbox casing9, 3^rd speed driven gear10, 4^th speed driven gear11, Rear bearing retaining plate12, 5^th speed driven gear.13, Layshaft14, Rear cover5^th speed drive gear16, Bell housing