Test Driving Procedures

Page 8

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Volvo Bus Service and Maintenance Manual

Heating system, Ventilation, Air Conditioning

Check the heating and ventilation. The controls should be easy to operate and should stop where set.

The fans for the heating and air conditioning should operate when the switch is moved to the various positions. Listen for undue noise.


Open each door slowly, then close it. Make sure the grab bars and door automatic mechanism are undamaged and that the door interlock function works. Check the kneeling function.

Artic buses: When test-driving an artic bus, reverse it slowly so that the trailing unit is at an angle to the driving unit. The jackknifing brake and warning signal should operate before both units are at too acute an angle to each other.

Kneeling function

Check the kneeling function. Check that the kneeling can be disengaged by releasing the switch. The bus must not take too long a time to go down or up.

Note! Different buses may have different types of inhibitor function, depending on how it is connected to the door-opening function.

Note any faults discovered for later evaluation in connection with measures specified in the operation-reliability checks, every 6 months or at the checks every 12 months.

Driver's Report

The driver's report is an excellent means for quickly remedying any faults. Simple remedies can be carried out at the daily inspection, otherwise the driver's report can be used for planning a necessary visit to the workshop.

Given below is a list of possible faults listed in a driver's report. To save time it is important that the driver pinpoints faults discovered as accurately as possible.

Engine:overheats, weak power, difficult to start, low oil pressure, low oil.
Transmission:slips, noisy operation, 1st/reverse difficult to engage.
Brakes:pull to one side, poor operation, grab, parking brake inoperative.
Front end:imbalance, steering wheel shimmies, bumpy, heavy steering.
Fluid leakage:inside bus, under bus, front, rear.
Compressed air:slow charging, rapid pressure drop.
Tyres:worn, punctured, damaged.
Driver's seat:sinks, loose, cannot be adjusted.
Wipers:do not function, blades worn, poor wiping (left or right).
External lighting:parking lights, full/dipped beams, brake lights, flashers, tail lights, position lights.
Internal lighting:driver's area, roof, doors, instruments.
Instruments:speedometer fluctuates, gauge does not function.
Heating/Ventilation:defroster, floor heater, fans, inoperative, too hot, too cold.
Stop signal:signal lamp, buzzer, signal activator does not function.