Paccar PX 8 Operator's Manual - page 24
Operating Instructions
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Y53-1030A 12/09
PACCAR
Idle the engine 3 to 5 minutes before operating with a load.
After starting a cold engine, increase the engine speed (rpm)
slowly to provide adequate lubrication to the bearings and to
allow the oil pressure to stabilize.
Some engines are equipped with a Fast Idle Warm Up
feature. When enabled, this feature elevates the idle speed
of the engine in cold ambient conditions, in order to shorten
the time necessary to warm up the engine. When the idle
speed is elevated, the engine noise may change, this is
normal. To bring the engine back to low idle speed:
• For vehicles equipped with a manual transmission and
clutch switch: Depress the clutch pedal.
• For vehicles equipped with a brake switch: Depress the
service brake pedal.
• Depress the accelerator pedal.