Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
STARTING AND OPERATING THE VEHICLE<br />
Electrohydraulic Pump: The Electrohydraulic (EH)<br />
pump is used as a backup boost pump. The EH pump<br />
turns on and provides fluid pressure to the hydraulic<br />
booster in the event power steering fluid stops flowing<br />
through the booster head.<br />
Front and Rear Wheel Calipers: translate hydraulic fluid<br />
pressure into force applied at each wheel-end brake rotor<br />
to retard wheel motion.<br />
Hydraulic Booster: The hydraulic booster applies additional<br />
hydraulic force from the power steering gear to the<br />
master cylinder piston when the brake pedal is applied.<br />
Parking Brake Lamp: illuminates when the parking brake<br />
is engaged (the lever is in the up position.)<br />
Parking Brake Lever: the hand lever located in the cab<br />
which engages or disengages the driveline drum brake.<br />
Power Steering Flow Switch: senses flow of power<br />
steering fluid.<br />
Power Steering Fluid Reservoir: stores power steering<br />
fluid and offers a place to replenish when needed.<br />
USING THE BRAKE SYSTEM<br />
Power Steering Gear: assists the steering operation and<br />
sends pressurized power steering fluid to the brake<br />
booster.<br />
Power Steering Pump: draws power steering fluid from<br />
the reservoir and sends it to the power steering gear.<br />
Warning Buzzer: sounds when either power steering<br />
fluid flow is interrupted or when a pressure differential is<br />
present between the primary and secondary brake fluid<br />
pressure. Either case adversely affects braking operation.<br />
Brake Warning Lamp<br />
When the brake warning lamp comes on, it indicates a<br />
malfunction in the brake system. Possible malfunctions<br />
include loss of hydraulic pressure from the power steering<br />
circuit or a pressure differential between the primary and<br />
secondary brake circuits.<br />
WARNING! Do not operate the vehicle if the<br />
brake light or buzzer comes on. The light or<br />
buzzer indicates a failure in one of the brake<br />
components/system. Safely drive your vehicle<br />
to the side of the road immediately. Failure to<br />
do this may lead to an accident, causing death<br />
or personal injury.<br />
<strong>Medium</strong> <strong>Duty</strong> (R05/09) Y53-6027 – 123 –
Change language