Foreword

Foreword

The maintenance operations consist of checking and restoring the efficiency of certain vehicle components subject to wear which may deteriorate during normal usage conditions.

This section describes the operations which should be carried out on the vehicle at the intervals set out in the Planned Maintenance Programme (on the previous page). Each operation is described independently, on account of which there is no pre-defined ideal operating cycle to be repeated at each interval. It is therefore necessary to ensure that those operations which require the same components to be dismantled are carried out at the same intervals in order to maximize the efficiency of the repair times.

If, when carrying out each operation, the need arises to carry out additional replacements or further repairs not envisaged in the Planned Maintenance Programme, prior approval must be obtained first from the Customer.

PLANNED MAINTENANCE OPERATIONS

1 CHECK CONDITION OF TYRES AND WEAR

Check the condition of the tyres making sure, in particular, that there are no signs of ageing on the tread and the tyre walls, that the tyres are not excessively/unevenly worn, that there are no abrasions/burrs, porousness or cuts.

Check the depth of the tread using a special gauge, taking the measurement at the intersection between the transverse and longitudinal splining (at several points on the circumference). The minimum permissible depth is 1.6 mm. The difference between the depths of tread on the same tyre should not exceed 2 mm. The difference between the depths of tread on different tyres on the same axle should not exceed 5 mm.

If the tread wear is uneven, check the tyre inflations pressure and inform the Customer of the possible need to balance the wheels.