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Group 170 Preventive Maintenance

Test Driving

Check After Start

Check Clutch Operation

Note: For further information refer to literature in Func-

tion Group 4.

Read through the road test section to become familiar

with what needs to be checked before taking the vehi-

cle on the road. Do not read while operating the

vehicle-loss of vehicle control may occur.

Start the test drive by checking clutch pedal play and

clutch operation. Clutch pedal play should be 4 to 10

mm (0.15 to 0.40 in.), which is the clearance between

the pedal plunger and the piston in the master cylinder.

On VN/VHD vehicles with clutch brake, check function

by depressing clutch pedal to within 6 to 12 mm (1/2 to 1

in.) from the ﬂoor while engaging a gear. There should

be no grating of the engagement teeth when the clutch

brake is engaged.

Check Parking Brake and Clutch Slip

Note: For further information refer to literature in Func-

tion Groups 4 and 5.

Check for parking brake holding power and also for

clutch slippage by engaging direct gear, not allowing the

engine speed to go above 1000 rpm and attempt to

drive off with the parking brake still applied. The parking

brake should hold the vehicle stationary while letting the

clutch up slowly to the point where the engine almost

stalls or stops.

If the clutch slips or the truck moves forward during this

operation, note on form for later inspection of either the

clutch or spring brake operation.

Release parking brake and start driving. Check that the

parking brakes are released quickly and that no brake

drag can be felt.

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Volvo VHD Wartungshandbuch Seite 88