Regional Haul Model Operator's Manual - Peterbilt Motors Company
Regional Haul Model Operator's Manual - Peterbilt Motors Company
Regional Haul Model Operator's Manual - Peterbilt Motors Company
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PREVENTIVE MAINTENANCE<br />
• Maintain the air compressor to prevent excessive oil<br />
by-pass. See the Maintenance <strong>Manual</strong> for maintenance<br />
details.<br />
• Replace worn seals in valves and air motors as they<br />
are needed. Your <strong>Peterbilt</strong> Dealer carries rebuild kits<br />
for most units.<br />
Dual Air Gauge and Air Leaks<br />
Your <strong>Regional</strong> <strong>Haul</strong> vehicle comes with a primary and<br />
secondary air pressure guage. The gauge indicates the<br />
amount of air pressure in pounds per square inch (psi).<br />
See “Primary (Secondary) Air Pressure Gauge (Air Reservoir)”<br />
on page 42.<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<br />
(414 kPa), a warning light on the gauge will glow and the<br />
audible alarm will sound. If the light and alarm do not turn<br />
off at start-up, do not try to drive the vehicle until the problem<br />
is found and fixed.<br />
AIR SYSTEM<br />
WARNING! Do not operate the vehicle if leakage<br />
in the air system is detected. Conduct the<br />
following procedure and contact an Authorized<br />
Service Center (or any other properly<br />
equipped service center) if a leak is detected.<br />
Failure to check the brakes or follow these<br />
procedures could cause a system failure,<br />
increasing the risk of an accident resulting in<br />
death or personal injury.<br />
Follow the procedure below to check the compressed air<br />
system for leaks:<br />
1. Periodically, or after maintenance or replacement of<br />
air system components:<br />
2. Build up air pressure in the system to the governor<br />
cut-out point or until 120 psi (827 kPa) is reached.<br />
3. Stop the engine and release the service brakes.<br />
4. Without applying the brake pedal, observe the rate of<br />
air pressure drop. This rate should not exceed 2.0 psi<br />
(14 kPa) per minute.<br />
5. Start the engine and build up the air pressure again.<br />
6. Stop the engine, and apply the brakes fully. Apply the<br />
brake pedal and hold it down for five minutes. The<br />
pressure drop should not exceed 3.0 psi (21 kPa) per<br />
minute.<br />
<strong>Regional</strong> <strong>Haul</strong> (R05/10) Y53-6033 – 193 –