Regional Haul Model Operator's Manual - Peterbilt Motors Company

AIR SYSTEM
• Always apply the tractor and trailer parking
brakes when the vehicle is unattended.
Contamination of the air supply system is the major cause
of problems in air-operated components such as brake
valves, wiper motors, and suspension height control
valves. To keep contaminants to the lowest possible level,
follow these maintenance procedures.
Table 5
Air System Scheduled Maintenance
Scheduled Maintenance
PREVENTIVE MAINTENANCE
Use Table 5, ”Air System Scheduled Maintenance,” to
schedule service operations and air system tests.
MAXIMUM INTERVALS
TEST
EACH WEEK
EACH MONTH
(10,000 mi) (16,000
km)
THREE MONTHS
(25,000 mi) (40,000
km)
SIX MONTHS
(50,000 mi) (80,000
km)
Air Compressor
•
Air Governor
•
System Leakage
•
Dual Air Brake Treadle Valve • – or – •
Hand–Operated Trailer Brake Valve • – or – •
Tractor Parking Valve
•
Parking Brake Valve
•
Trailer Air Supply
•
Tractor Protection Valves
Relay Valve
Spring Brake Inversion Valve
Automatic Limiting Valve
Single Check Valves
Double Check Valves
•
•
ANNUALLY
(100,000 mi)
(160,000 km)
•
•
•
•
– 190 – Y53-6033 Regional Haul (R05/10)