MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
Air System CAUTION: Do not use penetrating oil, brake fluid, or wax-based oils in the air system. These fluids may cause severe damage to air system components. • Maintain the air compressor to prevent excessive oil bypass. See the Medium Duty Maintenance Manual for maintenance details. • Replace worn seals in valves and air motors as they are needed. Your Peterbilt Dealer carries rebuild kits for most units. Preventive Maintenance service center) if a leak is detected. Failure to check the brakes or follow these procedures could cause a system failure, increasing the risk of an injury accident. FRONT SECONDARY SERVICE CIRCUIT (WHITE) Dual Air Gauge and Air Leaks Your Model 330 comes with a dual-circuit air pressure gauge for two separate systems, Primary and Secondary: the WHITE pointer indicates pressure in the front (Secondary) braking circuit; the ORANGE pointer indicates pressure in the rear (Primary) braking circuit. The gauge indicates the amount of air pressure in pounds per square inch (psi). WARNING! Do not operate the vehicle if leakage in the air system is detected. Conduct the following procedure and contact an Authorized Service Center (or any other properly equipped 02581 Dual Air Pressure Gauge (Air Reservoir) REAR PRIMARY SERVICE CIRCUIT (ORANGE) If the pressure in either or both systems is too low for normal brake operation, i.e., either pointer falls below 60 psi (414 kPa), a warning light on the gauge will glow and the audible alarm will sound. If the light and alarm do not turn off at startup, do not try to drive the vehicle until the problem is found and fixed. – 166 – PB1318 3/01 Model 330
Preventive Maintenance Follow the procedure below to check the compressed air system for leaks: 1. Periodically, or after maintenance or replacement of air system components: 2. Build up air pressure in the system to the governor cutout point or until 120 psi (827 kPa) is reached. 3. Stop the engine and release the service brakes. 4. Without applying the brake pedal, observe the rate of air pressure drop. This rate should not exceed 2.0 psi (14 kPa) per minute. 5. Start the engine and build up the air pressure again. 6. Stop the engine, and apply the brakes fully. Apply the brake pedal and hold it down for five minutes. The pressure drop should not exceed 3.0 psi (21 kPa) per minute. 7. If you detect excessive leakage (air pressure loss greater than 3.0 psi after five minutes of brake application), a leakage test should be made at the air line connections and at all air brake control units. These tests should determine where air is escaping. Air Compressor Operation Air System All compressors, regardless of make or model, run continuously while the engine is running. System pressure is controlled by the governor. The governor acts in conjunction with the unloading mechanism in the compressor cylinder block to start and stop compression of air. The compressor is unloaded when the system pressure reaches 120 psi (827 kPa) and compression is re-established when system pressure falls to 100 psi (690 kPa). Preventive Maintenance The following service checks are provided for your information only and should be performed by a certified mechanic. Contact your Peterbilt Dealer or consult the Medium Duty Maintenance Manual and the engine manufacturer’s Maintenance Manual for further information on servicing air compressors. After completing any repairs to the air system, always test for air leaks, and check the brakes for safe operation before putting the vehicle in service. Model 330 PB1318 3/01 – 167 –
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Air System<br />
CAUTION: Do not use penetrating oil, brake<br />
fluid, or wax-based oils in the air system. These<br />
fluids may cause severe damage to air system<br />
components.<br />
• Maintain the air compressor to prevent excessive oil bypass.<br />
See the Medium Duty Maintenance Manual for<br />
maintenance details.<br />
• Replace worn seals in valves and air motors as they are<br />
needed. Your <strong>Peterbilt</strong> Dealer carries rebuild kits for most<br />
units.<br />
Preventive Maintenance<br />
service center) if a leak is detected. Failure to check the<br />
brakes or follow these procedures could cause a system<br />
failure, increasing the risk of an injury accident.<br />
FRONT<br />
SECONDARY<br />
SERVICE<br />
CIRCUIT<br />
(WHITE)<br />
Dual Air Gauge and Air Leaks<br />
Your Model <strong>330</strong> comes with a dual-circuit air pressure gauge<br />
for two separate systems, Primary and Secondary: the<br />
WHITE pointer indicates pressure in the front (Secondary)<br />
braking circuit; the ORANGE pointer indicates pressure in<br />
the rear (Primary) braking circuit. The gauge indicates the<br />
amount of air pressure in pounds per square inch (psi).<br />
WARNING! Do not operate the vehicle if leakage<br />
in the air system is detected. Conduct the following<br />
procedure and contact an Authorized Service<br />
Center (or any other properly equipped<br />
02581<br />
Dual Air Pressure Gauge (Air Reservoir)<br />
REAR<br />
PRIMARY<br />
SERVICE<br />
CIRCUIT<br />
(ORANGE)<br />
If the pressure in either or both systems is too low for normal<br />
brake operation, i.e., either pointer falls below 60 psi (414<br />
kPa), a warning light on the gauge will glow and the audible<br />
alarm will sound. If the light and alarm do not turn off at startup,<br />
do not try to drive the vehicle until the problem is found<br />
and fixed.<br />
– 166 – PB1318 3/01 Model <strong>330</strong>