operators_manual

engine air pre-cleaner for any
obstructions. Make sure the purge
valve will open and close as
needed to purge dirt and water
from the engine intake air.
• Automatic transmission fluid
(where applicable) - Check level,
after the engine has warmed up to
operating temperature.
Chassis and Cab Exterior
• Battery - check battery and
terminals.
• Hood supports and guides are
properly lubricated.
• Wheel cap nuts - are they all in
place and torqued properly -
tighten if necessary. Wheels on
page 294
• Controls and wiring - check for
condition and adjustment
• Steering components - check
pitman arm, drag link, intermediate
shaft U-joint pinch bolt, tie rod,
steering shaft and power steering
hoses, etc., for loose, broken, or
missing parts.
• Cab air conditioner fresh air filter -
check for condition and
cleanliness.
• PACCAR 20k Front Axle Kingpin
Joint Grease/Tie Rod Ends (option)
(VOCATIONAL USE) - For
vocational vehicles with this axle,
grease with Heavy-Duty
Multipurpose Lithium Based: #1 or
#2 grade, every 50 hours. (Refer to
Front Axle and Suspension on
page 273 for maintenance
instructions.)
Systems Check
System Check Display
Systems Check evaluates each monitored
system and displays its progress for the
operator. The Systems Check will appear
when the Exterior Lighting Self-Test (ELST)
is activated, or when viewing the
Notifications sub-menu.
Systems Check can be interrupted at any
time by
• Pressing Select
• Switching the ELST switch to OFF
• Turning the ignition key to OFF or
ACC
• Releasing the Parking Brake.
The Systems Check can also present the
following optional features.
Tire Pressure Monitoring System
(TPMS) (option)
One of the systems the vehicle monitors is
the Tire Pressure Monitoring System
(TPMS).
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SAFETY - Systems Check
Y53-6126-1A1 (01/21) 37
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