6 Scheduled Maintenance
58
Check Air System for Leak Down
— Disconnect the
gladhands from the trailer. Run the engine at fast idle and
allow air pressure to stabilize at 120 P.S.I. for at least 1 minute.
Shut off the engine and observe the dash gauge(s) for 2
minutes. The drop in pressure should not exceed 2 P.S.I.
(0.137 bar) over the 2-minute period.
Check Operation of Back-Up Alarm
— With the engine
running, move the gear selector to reverse and listen for the
back-up alarm.
Check HVAC System
앫
Blower Motor Operation
— With the key on, ensure that
the blower motor operates at each position of the blower
speed switch.
앫
Temperature Control
— Confirm proper operation of the
temperature control switch.
앫
Defroster Operation
— With the engine running and the
defroster control turned on, confirm air flow from the
defroster vents.
앫
Air Conditioner Operation
(if applicable)
— With the
engine running and the air conditioner control turned on,
confirm cooled air flow from the defroster vents.
앫
Auxiliary Fan(s)
(if applicable)
— With the key on, turn on
the auxiliary fans and confirm operation.
Check Fifth Wheel Unlatch Control
— With the system air
pressure above 100 P.S.I., confirm that the fifth wheel jaws
unlatch when the dash control is activated.
Check Operation of Boom
— With the engine running at fast
idle, activate the boom control and ensure full extension and
retraction.
Check Operation of Windows
— Confirm that all regulated
and sliding windows open and close fully.
Check Door Latch Operation
— Operate the door latch from
inside and outside the cab to ensure proper operation.
Check Dome Light Operation
— With the key on, turn on the
cab dome light and confirm operation.
Check All Glass and Mirrors
— Inspect all glass and mirrors
for cracks and breaks.
Check Fire Extinguisher Charge
(if applicable)
— If the
vehicle is equipped with a fire extinguisher, confirm that it is
properly charged.
