Astra HD8Ec Manuel - Sayfa 5

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ASTRA HD8Ec

DESCRIPTION

The ZF 16S 1620 and ZF 16S 2320 TD version consist of:

- a central box containing the primary shaft, drive input shaft,

secondary shaft and the cogs of the four forward and one

reverse gear;

- a rear casing containing the Epicyclical Reducer Group

(G.R.E). The function of this is to double the number of

forward gears by means of epicyclical gears with helical

teeth.

This gives a range of gears that starting with four input

ratios permits eight different output ratios (four normal

ratio and four low ratio gears);

- a front casing containing the "splitter", that gives a further

double selection for each of the eight forward gears and

for the reverse gear.

The "splitter" halves the difference between two

successive gears, effectively splitting each gear into a slow

ratio (L = slow ratio) and a fast ratio (S = fast ratio).

These gearboxes therefore have a total of sixteen forward

gears with finely scaled ratios, all engageable in succession, and

two reverse gears.

The synchronisers are single cone type.

Figure 1

1. Distributor – 2. Servoshift – 3. Servoclutch – 4. *Servoshift power electrovalve

only for vehicles with F3B engine

SECTION 6

Lubrication is by means of a gear pump.

The double H type gear shift control is equipped with a

pneumatically powered "servoshift" device to improve gear

selection and engagement.

The servoshift is a device consisting of a mechanical/pneumatic

functional unit and a dual action cylinder.

The advantages of this device are:

- gear selection and engagement more rapid and with less

effort;

- it dampens the vibration of the control linkages, reducing

noise;

- less strain to the synchronisers.

The device functions mechanically in case of pneumatic system

failure.

The gearboxes mounted of vehicles with F3B engines are fitted

with a synchro protection device.

This permits pneumatic power to the servoshift for gear

engagement only after the clutch pedal has completed 70% of

the disengagement stroke.

It consists of an electrovalve controlled by a proximity switch

mounted on the clutch disengage master cylinder.

MANUAL GEARBOX

99356