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 ...
Operating the Clutch service department perform any adjustments necessary. Do not adjust your clutch by adjusting the external linkage without first checking (and correcting if necessary) the internal clutch adjustment. Using only the external linkage adjustment could damage the clutch. Clutch Brake Your clutch brake is used for stopping gear rotation to let you shift into 1st gear or reverse when your vehicle is at a standstill. About the last 1/2 to 1 inch of clutch pedal travel activates your clutch brake. So if you are stopped and want to shift directly into 1st or reverse, depress the clutch pedal until contact with the clutch brake is made to stop transmission gear rotation. If you have a butt-tooth condition and can’t shift the transmission, gradually release the clutch. Then the drive gear can roll enough to allow the teeth to line up properly and complete the shift. PART 7: STARTING & OPERATING THE VEHICLE CAUTION: Be careful not to apply the clutch brake while the vehicle is moving. The purpose of the clutch brake is to stop the transmission so that you can shift into a starting gear without grinding. Applying the clutch brake when the vehicle is moving causes a braking effect on the entire vehicle. This wear naturally shortens the service life of your clutch brake. Double Clutching Whether you are upshifting or down shifting, it is best to double clutch. Double clutching is easier on your transmission and on your engine, helping your vehicle match engine speed with driveline speed and achieving clash free shifts. To double clutch: 1. Push down the clutch pedal to disengage the clutch. 2. Move the gear shift lever to neutral. 3. Release the pedal to engage the clutch. This lets you control the RPM of the mainshaft gears. Thus you can match the RPM of the mainshaft gears to those of the output shaft. Upshifts- Let the engine and gears slowdown to the RPM required for the next gear. Use the tachometer to determine optimum RPM for gear engagement. Downshifts- Press accelerator to increase engine and gear speed to the RPM required in the lower gear. Use the tachometer to determine optimum RPM for gear engagement. – 80 – Y53-6015 R(08/07)
PART 7: STARTING & OPERATING THE VEHICLE 4. Now quickly press the pedal to disengage the clutch. Move the gear shift lever to the next gear speed position. 5. Release the pedal to engage the clutch. Interaxle Differential On vehicles with tandem rear axles, the interaxle differential allows each axle to turn independently. Differential action between the tandems relieves stress on the rear axles and tires and provides better performance. When operating normally on paved, dry surfaces, keep your truck’s interaxle differential in the UNLOCK position. Interaxle Differential In the LOCK position, continuous operation on a paved, dry surface stresses the tandem axles, possibly causing internal damage to them. • Shift into the LOCK position to operate on slippery surfaces like – Ice or snow - with or without tire chains – Dirt roads – Loose sand, mud, or other off-road conditions • Switch into LOCK when checking performance on a chassis dynamometer. 0004 Switch In Unlock Position R(08/07) Y53-6015 – 81 –
- Page 34 and 35: Air Suspension Deflate Switch (Dump
- Page 36 and 37: Engine Brake Cruise Control Switch
- Page 38 and 39: Fifth Wheel Lock (Slider Adjustment
- Page 40 and 41: Heating And Air Conditioning Contro
- Page 42 and 43: Heating And Air Conditioning Contro
- Page 44 and 45: Heating And Air Conditioning Contro
- Page 46 and 47: Gauges And Displays Cigarette Light
- Page 48 and 49: Speedometer-Message Center (SMC)
- Page 50 and 51: Air Application Gauge Tachometer Ai
- Page 52 and 53: Engine Oil Pressure Gauge WARNING!
- Page 54 and 55: Water Temperature Gauge cept for ce
- Page 56 and 57: Front Drive Axle or Rear Drive Axle
- Page 58 and 59: Air Filter Restriction Indicator Ga
- Page 60 and 61: Mirrors Mirrors WARNING! Optional c
- Page 62 and 63: Lap/Shoulder Belt PART 5: SEAT AND
- Page 64 and 65: Proper Safety Belt Adjustment PART
- Page 66 and 67: Pregnant Women PART 5: SEAT AND RES
- Page 68 and 69: Tether Belts PART 5: SEAT AND RESTR
- Page 70 and 71: Inspection of the Restraint System
- Page 72 and 73: Inspection of the Restraint System
- Page 74 and 75: Checking Under the Hood or Cab PART
- Page 76 and 77: After Engine Warmup 17.Check spring
- Page 78 and 79: Engine Warmup If the engine still w
- Page 80 and 81: Transmission Warmup CAUTION: The us
- Page 82 and 83: Shifting Gears in a New Vehicle CAU
- Page 86 and 87: Dual Range (Two Speed) Axles WARNIN
- Page 88 and 89: Automatic and Automated Transmissio
- Page 90 and 91: If Your Vehicle Must Be Towed PART
- Page 92 and 93: Anti-Lock Braking System Operating
- Page 94 and 95: ABS Warning Lamps PART 7: STARTING
- Page 96 and 97: Overheated Brakes PART 7: STARTING
- Page 98 and 99: Parking Brakes and Their Use PART 7
- Page 100 and 101: Manually Releasing Spring Brakes PA
- 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
- Page 116 and 117: Preventive Maintenance Schedule PAR
- Page 118 and 119: Preventive Maintenance Schedule PAR
- Page 120 and 121: Preventive Maintenance Schedule PAR
- Page 122 and 123: Preventive Maintenance Schedule PAR
- Page 124 and 125: Preventive Maintenance Schedule PAR
- Page 126 and 127: Preventive Maintenance Schedule PAR
- Page 128 and 129: Preventive Maintenance Schedule PAR
- Page 130 and 131: Preventive Maintenance Schedule PAR
- Page 132 and 133: Preventive Maintenance Schedule PAR
PART 7: STARTING & OPERATING THE VEHICLE<br />
4. Now quickly press the pedal to disengage the clutch.<br />
Move the gear shift lever to the next gear speed position.<br />
5. Release the pedal to engage the clutch.<br />
Interaxle Differential<br />
On vehicles with tandem rear axles, the interaxle differential<br />
allows each axle to turn independently. Differential action<br />
between the tandems relieves stress on the rear axles<br />
and tires and provides better performance. When operating<br />
normally on paved, dry surfaces, keep your truck’s interaxle<br />
differential in the UNLOCK position.<br />
Interaxle Differential<br />
In the LOCK position, continuous operation on a paved,<br />
dry surface stresses the tandem axles, possibly causing<br />
internal damage to them.<br />
• Shift into the LOCK position to operate on slippery surfaces<br />
like<br />
– Ice or snow - with or without tire chains<br />
– Dirt roads<br />
– Loose sand, mud, or other off-road conditions<br />
• Switch into LOCK when checking performance on a<br />
chassis dynamometer.<br />
0004<br />
Switch In Unlock Position<br />
R(08/<strong>07</strong>) Y53-6015 – 81 –
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