Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ... Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Brake Adjustment PART 8: MAINTENANCE AND SERVICE Air System • Build up air pressure in the system to the governor cut-out point. • Stop the engine. • Release the parking brakes (push in the yellow knob). • Watch the rate of air pressure drop. The rate of drop should not be more than 2 psi (14 kPa) per minute. • Now start the engine and build up the air pressure again. • Stop the engine. Ensure that the parking brakes are still released (i.e., the yellow knob is pushed in). • Fully apply the service brakes. • Watch the rate of air pressure drop registered by the air gauge. The rate of drop should not be more than 3 psi (21 kPa) per minute. • If you find excessive leakage, a leakage test should be made at the air line connections and at all air brake control units. To perform a leakage test, refer to the detailed instructions in the Peterbilt Maintenance Manual, or take your vehicle to an authorized Peterbilt dealer. Drum Brakes Have brake drum linings and disc brake pads inspected by a qualified mechanic for wear at regular intervals according to the maintenance schedule. In severe service or offhighway applications inspect the linings more frequently. Automatic Slack Adjusters Periodically check the Brake Chamber Stroke. Replace the slack adjuster if proper stroke cannot be maintained. Operational checks of automatic slack adjusters • Measure brake chamber stroke with the spring brake released and the air pressure no less than 100 psi (690 kPa). • Brake Chamber Stroke is the difference between the applied and the retracted position of the air chamber pushrod. • A correctly installed and functioning auto slack adjuster will produce the following strokes: – 148 – Y53-6015 R(08/07)
PART 8: MAINTENANCE AND SERVICE Tires Chamber Type Stroke 36 (rear brakes) 11/2” - 21/4” (38 - 57 mm) 30 (rear brakes) 11/2” - 2” (38 - 51 mm) 16, 20, & 24 (front brakes) 1” - 13/4” (25.4 - 44.4 mm) effectiveness of the brakes. Contact the Service Department at your dealership if the stroke exceeds the above specifications. A stroke exceeding these values may indicate a problem with the slack adjuster or the brake foundation. Tires, Wheels, And Rims Tires 02945a Brake Chamber Stroke WARNING! Manual adjustment of automatic slack adjusters is a dangerous practice that could have serious consequences. It gives the operator a false sense of security about the WARNING! You can be badly injured trying to fix tires. Don’t mount or dismount a tire yourself; have any wheel service performed by an expert. Andstandawayfromthetireassemblywhile the expert is working. Your tires are a very important part of your vehicle’s whole braking system. How fast you can stop depends in large measure on how much friction you get between the road and your tires. In addition, keeping your tires in good condition is essential to the safe, efficient operation of your vehicle. Regular, frequent inspection and the right care will give you the assurance of safe and reliable tire operation. Here are some tips on maintaining your tires. R(08/07) Y53-6015 – 149 –
- Page 102 and 103: Before Stopping The Engine PART 7:
- Page 104 and 105: Setting Ride Height PART 7: STARTIN
- Page 106 and 107: Setting Ride Height PART 7: STARTIN
- Page 108 and 109: Driving Tips And Techniques WARNING
- Page 110 and 111: Dual Steer Vehicle Operation NOTE:
- Page 112 and 113: Dual Steer Vehicle Operation PART 7
- Page 114 and 115: Preventive Maintenance Schedule PAR
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- Page 120 and 121: Preventive Maintenance Schedule PAR
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- Page 134 and 135: Preventive Maintenance Schedule PAR
- Page 136 and 137: Preventive Maintenance Schedule PAR
- Page 138 and 139: Preventive Maintenance Schedule PAR
- Page 140 and 141: Master Lubrication Index WARNING! E
- Page 142 and 143: Fuller Transmission Lubrication PAR
- Page 144 and 145: Spicer Transmission Lubrication Rec
- Page 146 and 147: Meritor Axle Lubrication PART 8: MA
- Page 148 and 149: Wheel Bearing Lubrication PART 8: M
- Page 150 and 151: Brake Adjustment PART 8: MAINTENANC
- Page 154 and 155: Tires Checking Inflation Pressure G
- Page 156 and 157: Tires PART 8: MAINTENANCE AND SERVI
- Page 158 and 159: Tires PART 8: MAINTENANCE AND SERVI
- Page 160 and 161: Tires PART 8: MAINTENANCE AND SERVI
- Page 162 and 163: Wheels And Rims Wheels And Rims PAR
- Page 164 and 165: Wheels And Rims PART 8: MAINTENANCE
- Page 166 and 167: Vehicle Loading PART 8: MAINTENANCE
- Page 168 and 169: Air Dryer then goes to the reservoi
- Page 170 and 171: Engine Cooling System Engine Coolin
- Page 172 and 173: Engine Cooling System ELC Extender
- Page 174 and 175: Battery Care Electrical CAUTION: Do
- Page 176 and 177: Battery Care • Keep the battery c
- Page 178 and 179: Battery Care damage to the vehicle,
- Page 180 and 181: Fuel Filters WARNING! A mixture of
- Page 182 and 183: Frame Fastener Torque Specification
- Page 184 and 185: Accessory Drive Belts • Always to
- Page 186 and 187: Anti-lock Braking System (ABS) Serv
- Page 188 and 189: Heater controller for that axle to
- Page 190 and 191: Painted Surfaces Special Precaution
- Page 192 and 193: Interior General Cleaning Guideline
- Page 194 and 195: Tampering with Noise Control System
- Page 196 and 197: Inspection & Maintenance Instructio
- Page 198 and 199: Air Intake System Shields and Skirt
- Page 200 and 201: PART 9: VEHICLE IDENTIFICATION NUMB
PART 8: MAINTENANCE AND SERVICE<br />
Tires<br />
Chamber Type<br />
Stroke<br />
36 (rear brakes) 11/2” - 21/4” (38 - 57 mm)<br />
30 (rear brakes) 11/2” - 2” (38 - 51 mm)<br />
16, 20, & 24 (front brakes) 1” - 13/4” (25.4 - 44.4 mm)<br />
effectiveness of the brakes. Contact the Service<br />
Department at your dealership if the stroke<br />
exceeds the above specifications. A stroke<br />
exceeding these values may indicate a problem<br />
with the slack adjuster or the brake foundation.<br />
Tires, Wheels, And Rims<br />
Tires<br />
02945a<br />
Brake Chamber Stroke<br />
WARNING! <strong>Manual</strong> adjustment of automatic<br />
slack adjusters is a dangerous practice that<br />
could have serious consequences. It gives the<br />
operator a false sense of security about the<br />
WARNING! You can be badly injured trying to fix<br />
tires. Don’t mount or dismount a tire yourself;<br />
have any wheel service performed by an expert.<br />
Andstandawayfromthetireassemblywhile<br />
the expert is working.<br />
Your tires are a very important part of your vehicle’s whole<br />
braking system. How fast you can stop depends in large<br />
measure on how much friction you get between the road<br />
and your tires. In addition, keeping your tires in good condition<br />
is essential to the safe, efficient operation of your vehicle.<br />
Regular, frequent inspection and the right care will<br />
give you the assurance of safe and reliable tire operation.<br />
Here are some tips on maintaining your tires.<br />
R(08/<strong>07</strong>) Y53-6015 – 149 –
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