Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
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PART 7: STARTING & OPERATING THE VEHICLE<br />
Engine Overspeed<br />
Coasting<br />
Descending a Grade<br />
WARNING! Do not coast with the transmission<br />
in neutral or with the clutch pedal depressed—it<br />
is a dangerous practice. Without the use of<br />
the retarding power of the drivetrain, your vehicle<br />
can reach dangerous speeds. At very high<br />
speeds you may not be able to put the transmission<br />
in any gear. At high speeds you could<br />
seriously damage your vehicle or cause an accident<br />
when you put the transmission in gear.<br />
The engine speed could exceed the maximum<br />
governed speed and cause a serious accident<br />
due to mechanical failures.<br />
Do not coast with the transmission in neutral or with the<br />
clutch pedal depressed. Besides being illegal and dangerous,<br />
coasting is also expensive. It causes premature failure<br />
or damage to the clutch and transmission and overloads<br />
the brake system.<br />
Coasting with the transmission in neutral also prevents<br />
proper transmission component lubrication. During coasting<br />
the transmission is driven by the rear wheels, and the<br />
countershaft gear (which lubricates the transmission components<br />
by oil splash) will only be turning at idle speed.<br />
WARNING! Do not hold the brake pedal down<br />
too long or too often while going down a steep<br />
or long grade. This could cause the brakes<br />
to overheat and reduce their effectiveness. As<br />
a result, the vehicle will not slow down at the<br />
usual rate. To reduce the risk of personal injury<br />
and/or an accident, before going down a steep<br />
or long grade, reduce speed and shift the transmissionintoalowergeartohelpcontrolyour<br />
vehicle speed. Failure to follow procedures for<br />
proper downhill operation could result in loss<br />
of vehicle control.<br />
Engine Overspeed<br />
CAUTION: To avoid engine damage, do not let<br />
the engine rpm go beyond the maximum governed<br />
rpm—valve damage could result if overspeed<br />
conditions occur.<br />
R(08/<strong>07</strong>) Y53-6015 – 105 –
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