Cab Interior
Check Operation of Neutral Start – Move the gear selector to any position other than “N” and attempt to
start the engine. The engine should not crank with the selector in any position other than “N”.
Check Operation of All Gauges – With the engine is running verify that all gauges are functional.
Check Low Air Buzzer and Light – Apply and release the brake pedal until air pressure drops below 90
PSI. At that point, the low air buzzer and dash warning light should come on.
Check Windshield Wiper Operation – Turn on the windshield wiper on and confirm full and smooth
travel of the wiper arm. Listen for any noises that might indicate a worn wiper motor.
Check Windshield Washer Operation (If Applicable) – Depress the washer button and confirm the flow
and pattern of the washer fluid.
Check Accelerator for free operation – Depress and release the foot throttle and check for binding and
ease of operation.
Check Horn(s) Operation – Sound electric and air horns (if applicable) to confirm proper operation.
Check Air System for Maximum 120 PSI – Start engine and run at fast idle. Governor should limit
system air pressure to 120 psi.
Check Air System for Leak Down – Disconnect the gladhands from any trailer. Run engine at fast idle
and allow air pressure to stabilize at 120 psi for at least one minute. Shut off engine and observe dash
gauge(s) for 2 minutes. The drop in pressure should not exceed 2 psi over the two-minute period.
Check Operation of Back Up Alarm – With engine running, move the gear selector to reverse and listen
for back up alarm.
Check Operation of Shift Lock Out – With engine running, air pressure above 90 psi, and the parking
brake set, attempt to move the gear selector from any drive gear to reverse without depressing the brake
pedal. You should not be able to select reverse.
Check HVAC System
Blower Motor Operation – With the key on, insure that the blower motor operates at each
position of the blower speed switch.
Temperature Control – Confirm proper operation of the temperature control switch.
Auxiliary Fan(s) (If Applicable) – With the key on turn on the auxiliary fans and confirm
operation.
Air Conditioner Operation – With the engine running and the air conditioner control turned on,
confirm cooled airflow from the defroster vents.
Defroster Operation – With the engine running and the defroster control turned on, confirm
airflow from the defroster vents.
Check Operation of PTO Control (If Applicable) – With the truck running apply the parking brake and
move the gear selector to any drive gear. Confirm that the PTO engages and disengages when the dash
control is activated.
Check 5
th
Wheel Unlatch Control – With system air pressure above 100 psi confirm that the 5
th
wheel
jaws unlatch when the dash control is activated.
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