Medium Duty Operator's Manual - Peterbilt Motors Company

STARTING AND OPERATING THE VEHICLE
CAUTION: Never operate the starter motor
while the engine is running. The starter and
flywheel gears could clash or jam, severely
damaging them.
• Wait until normal engine oil pressure registers on the
gauge before idling or accelerating the engine beyond
1000 rpm.
• Watch the air pressure gauge. Wait until both pointers
register at least 100 psi (689 kPa) before releasing the
spring brake and moving the vehicle. Also, check the
alarm system for any type of faults and correct them
before moving the vehicle.
CAUTION: Do not try to put the vehicle in
motion before pressure in the air system
reaches 100 psi (689 kPa) because the wheels
will still be locked by the spring brake action.
• Unnecessary stress and possible brake
malfunction could occur if the vehicle is
forced to move before the air system
reaches 100 psi (689 kPa).
Starting Procedure — Cold Temperatures
In addition to the previous “Normal Starting Procedures,”
use these Cold Weather Starting guidelines when the air
temperature falls below a certain temperature. Check your
Engine Operation and Maintenance Manual for further
details on when cold weather starting aids are needed.
Using special cold-starting equipment will help the engine
start easier. And in cold weather, fast engine starting
helps relieve the loads on the electrical system and cranking
motor. If you follow these few simple guidelines, you
will extend the service life of your vehicle's engine:
• Keep the electrical system in top condition.
• Use the best quality and recommended grade of fuel
(see Engine Operation and Maintenance Manual).
• Use the recommended engine lubricating oil.
• As stated in the Normal Starting Procedures, when
temperatures are below normal, fully depress the
accelerator pedal after engaging the starter.
– 90 – Y53-6008A Medium Duty (R05/09)