Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Air System
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.
Scheduled Maintenance
Preventive Maintenance
Use Table 5, ”Air System Scheduled Maintenance,” to
schedule service operations and air system tests.
Table 5
Air System Scheduled Maintenance
TEST
EACH WEEK
MAXIMUM INTERVALS
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
Stop Light Switch
Low–Pressure Wig Wag
Low–Pressure Switch
•
•
•
ANNUALLY
(100,000 mi)
(160,000 km)
– 196 – Y53-6027 Medium Duty (R05/09)
•
•
•
•
•
•