User Manual
Table Of Contents
- Safety
- Emergency
- Controls
- Entering and Leaving the Vehicle
- Doors
- Electrically Operated Windows
- Heated Mirrors
- Mirrors
- Electrical Mirror Adjustment
- Windshield Wiper Blades
- Roof Console
- Sun Visors
- Stepwell Lighting
- Interior Lighting
- Dashboard
- Control Panel
- Control Panel of Heating/Ventilation System
- Air Conditioning Switch
- Fan Speed Selector Switch
- Temperature Adjustment
- Air Distribution Selector Switch
- Center Console
- Left-Hand Steering Column Switch
- Right-Hand Steering Column Switch
- Steering Wheel Switches
- Adjustable Steering Column
- Seats
- Master Display
- PDC and Voltage Display
- Power Distribution Center (PDC)
- Voltage Converter
- Driving
- General
- Steering Lock/Contact/Starter Switch
- Glow System
- Starting Procedure
- Engine Speed Control
- Cruise Control
- Adaptive Cruise Control (Optional)
- Vehicle Speed Limitation for Special Applications
- Driving Style
- Steering
- ABS Brakes
- Park Brake and Service Brake
- Engine Brake
- Stopping
- Allison Automatic Gearbox
- Maintenance
- Introduction
- Air Dryer
- Overhaul
- Air Tanks
- Air Gauges and Air Leaks
- Air Compressor
- Overview of Daily Checks
- Opening the Front Panel
- Engine Oil Level
- Topping Up Coolant
- Special Coolant Fill Instructions
- Windshield Washer Reservoir Fluid Level
- Air Filter Indicator
- Wheels and Tires
- Lighting and Instruments
- Driver's Seat and Mirrors
- Overview of Weekly Checks
- Power Steering Fluid Level
- Brake System Air Drier
- Draining the Water Separator
- Batteries
- General Maintenance
- Cab Maintenance
- Cleaning
- Preventative Maintenance before the Winter Season
- Diesel Fuel
- Windshield Washer Reservoir
- Maintenance after the Winter Season
- Cooling System
- Information
- Glossary
- Index
Air Dryer
The function of the air dryer is to collect
and remove air system contaminants in
solid, liquid and vapor form before they
enter the brake system. It provides clean,
dry air to the components of the brake
system, which increases the life of the
system and reduces maintenance costs.
NOTE
Because no two vehicles operate un-
der identical conditions, maintenance
and maintenance intervals will vary.
Experience is a valuable guide in de-
termining the best maintenance inter-
val for any one particular operation.
Every 900 operating hours or 25,000 miles
(50,200 km) or 3 months check for
moisture in the air brake system by
draining the air tanks and noting the
amount of moisture ejected. The air tanks
can be drained by the use of drain cocks or
pull cords, whichever your vehicle is
supplied with. If there is a significant
increase in moisture ejected compared to
the previous maintenance the air dryer
cartridge may need to be replaced. Note
that several factors may increase the
moisture accumulated in the system
including:
Saturated
air dryer
cartridge
• Higher than normal
accessory air
demands
• High daily
temperature
fluctuations (> 30°
F)
• Outside air source
used to charge truck
air system post air
dryer
At a minimum, PACCAR recommends
changing the air dryer cartridge annually.
WARNING
If a different air dryer brand or model is
installed on the vehicle other than
what was originally installed, it could
cause the air system to not perform
correctly unless the full air system de-
sign is reviewed and modifications
made to comply with Federal Motor
Vehicle Safety Standards (FMVSS)
121 AirBrake Systems. Failure to
abide by this warning and maintain
compliance to FMVSS 121 could
cause loss of vehicle control and may
lead to death or serious personal in-
jury.
Overhaul
Maintenance intervals typical for on-
highway operation would be 2 - 3 years,
350,000 miles or 10,800 hours.
Maintenance intervals typical for high duty
cycle usage such as transit bus, refuse
hauler, dump truck, cement mixers and off-
highway operation would be 1 year,
100,000 miles or 3,600 hours.
MAINTENANCE - Air Dryer
Y53-6078-1B1 (12/18/18) 99
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