Adjusting input shaft

(Determining thickness of shim for input shaft)

It is only necessary to readjust the input shaft when

• ◆ Gearbox housing
• ◆ Clutch housing
• ◆ Input shaft

or the

• ◆ Taper roller bearings

is renewed.

Adjustment overview

• ‒ → Press taper roller bearing outer race, with 1 mm adjustment shim, into gearbox housing onto stop.
• ‒ Install input shaft in gearbox housing and fit clutch housing. Tighten hexagon head bolts to 30 Nm.

• ‒ → Before taking any measurements rotate input shaft to allow taper roller bearings to settle.

• ‒ → Fit measuring appliance and D.T.I. (3 mm measuring range).

• A - 60 mm measurement extension

• ‒ Set D.T.I. to "O" with 1 mm preload.

Note:

This preparation is to be repeated for each subsequent measurement, otherwise the gauge will not return to the starting position.

• ‒ → Press input shaft using an assembly lever, in direction of D.T.I.
• ‒ Read off and note clearance indicated on D.T.I. (example 0.23).

Note:

D.T.I. does not return to original position.

Determining thickness of shim

The specified bearing preload is obtained by adding the gauge reading
(0.23 mm) and the thickness of the measurement shim installed
(1.00 mm) to a constant, for preload
(0.06 mm).

Example:

• ‒ Specify thickness of shim according to table => Page 35-18 and determine Part No. from parts catalogue.

Table of "shims":

    1)    To determine shim add gauge reading to measurement shim

• ‒ → Remove input shaft and pull taper roller bearing outer race out from clutch housing.
• ‒ Remove inserted measurement shim (1.00 mm thick) from clutch housing.
• ‒ Press taper roller bearing outer race together with selected shim (in example 1.29 mm) into clutch housing.
• ‒ Checking friction moment => Page 34-105.