Specifications

STARTING AND OPERATING THE VEHICLE

– 90 – Y53-6008A

Medium Duty (R05/09)

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

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 crank-

ing 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.