Operating Instructions

Page 42

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Volvo B58 Operator's Manual, TP 2003/1 English 2500. 2.80

Tyre inflating, power-assisted steering

TYRE INFLATING

If necessary the tyres can be inflated with air supplied by the vehicle's compressed-air system. This is done as follows:

NOTE! It is not necessary to release the parking brake.

Connect the clamp head of the tyre inflation hose supplied to the valve on the tyre to be inflated.
Connect the other end of the hose to the pump valve under the footbrake valve.
If necessary, start the engine so that the compressor boosts the compressed-air system. The highest pressure which the tyre can thereby be inflated is the same as the highest working pressure, that is, 7.3-8.0 bars (730-800 kPa).
Check to make sure that the blocking valve is pushed in.

POWER-ASSISTED STEERING

All that is really needed for the power-assisted steering to function perfectly is that the instructions concerning the oil and lubrication are followed.

Should the front wheels, however, be blocked sideways, e.g., against a curb, there is absolutely no point in trying to get the wheels away from the curb by forcing with the steering wheel. Excessive force on the steering wheel opens the guide valves and this causes the oil pressure to rise. If the oil pressure rises to max. 50-100 `bars (5-10 MPa), the oil temperature in the power-assisted steering gear will also rise with consequent risk of the oil pump overheating. An overheated oil pump can seize. If the hydraulic system should not function, nor the power-assisted steering, it will feel as if the steering gear has locked itself. This is not the case, however, you can steer the bus but more effort must be used in doing so.