Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
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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 ...

peterbilt.com
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20.05.2014 Views

Shifting Gears in a New Vehicle CAUTION: Do not allow your engine to idle, at low rpm’s (400–600 rpm), longer than five minutes. Long periods of idling after the engine has reached operating temperatures can decrease engine temperature and cause gummed piston rings, clogged injectors, and possible engine damage from lack of lubrication. The normal torsional vibrations generated can also cause transmission wear. During the time it takes you to drink a cup of coffee, your engine can cool as much as 60° F (33° C) below normal operating temperature. To keep the engine warm during a short break, turn it off. And don’t allow your engine to idle longer than five minutes. Putting The Vehicle In Motion This section discusses the clutch and transmission operation to get your Peterbilt underway. PART 7: STARTING & OPERATING THE VEHICLE WARNING! Do not carry loose objects in your cab, it can be dangerous. In a sudden stop, or even going over a bump in the road, they could fly through the air and strike you or a passenger. You could be injured or even killed. Secure all loose objects in the cab before moving the vehicle. Shifting The Transmission You will find a shift pattern either on a decal in your cab or on a medallion in the shift knob. Check to be sure you know the correct sequence for your particular transmission. Refer to the transmission manual included with your vehicle for complete instructions in the operation of your transmission. Shifting Gears in a New Vehicle Shift carefully in a new vehicle. The transmission may be a little stiff at first. So be careful to avoid gear clashing. When you are operating a new vehicle or one that has been exposed to cold weather, you want the transmission lubricant to circulate and coat the contacting surfaces of the gears. Metal contacting metal in moving parts may seriously damage your transmission. So don’t drive in one gear for long until the transmission lubricant has had a chance to coat those contacting surfaces. – 78 – Y53-6015 R(08/07)

PART 7: STARTING & OPERATING THE VEHICLE Operating the Clutch “Riding” the Clutch The clutch pedal is not a footrest. Driving with your foot on the clutch pedal will allow your clutch to slip, causing excessive heat and wear. You can damage your vehicle this way. Clutch Travel CAUTION: Always use firstgearoralowspeed range to start the vehicle in motion. The use of a higher gear or speed range forces undue strain on the engine, clutch, other transmission components, and may cause damage. To put your vehicle into motion, push down on the clutch pedal until the clutch brake makes contact. This contact will occur at about 1/2 inch to 1 inch from the end of pedal stroke. Select a gear low enough to let your vehicle start forward with the throttle at idle until the clutch is fully engaged. The total stroke of the clutch pedal is about 10 inches. The first 1 3/4 to 2 inches is free travel. After that is the release stroke, the part that fully releases the clutch. The last 1/2 Operating the Clutch to 1 inch engages the clutch brake. If your vehicle is new, watch the free travel in your clutch carefully for the first few hundred miles. As your clutch lining wears and high spots get worn smooth, you will get less free travel. Always start out in a low gear with a ceramic-faced clutch. Starting in higher gears, even with a light load, will cause a very jumpy start and excessive wear. And don’t allow your vehicle to roll in the opposite direction at all during clutch engagement. If you need to start up on an incline, apply your service brakes before you release the parking brake. Then release your service brakes as you engage the clutch and apply throttle. Release Bearing Wear When you must idle your engine for any period of time, shift your transmission to neutral and engage the clutch (take your foot off the pedal). This helps prevent unnecessary wear of your clutch release bearing. And it is less tiring for you, too. Clutch Adjustment Inspect manual and self-adjusting clutches regularly to maintain correct clutch adjustment. Have your dealer’s R(08/07) Y53-6015 – 79 –

Shifting Gears in a New Vehicle<br />

CAUTION: Do not allow your engine to idle, at<br />

low rpm’s (400–600 rpm), longer than five minutes.<br />

Long periods of idling <strong>after</strong> the engine has<br />

reached operating temperatures can decrease<br />

engine temperature and cause gummed piston<br />

rings, clogged injectors, and possible engine<br />

damage from lack of lubrication. The normal<br />

torsional vibrations generated can also cause<br />

transmission wear.<br />

During the time it takes you to drink a cup of coffee, your<br />

engine can cool as much as 60° F (33° C) below normal<br />

operating temperature. To keep the engine warm during a<br />

short break, turn it off. And don’t allow your engine to idle<br />

longer than five minutes.<br />

Putting The Vehicle In Motion<br />

This section discusses the clutch and transmission operation<br />

to get your <strong>Peterbilt</strong> underway.<br />

PART 7: STARTING & OPERATING THE VEHICLE<br />

WARNING! Do not carry loose objects in your<br />

cab, it can be dangerous. In a sudden stop, or<br />

even going over a bump in the road, they could<br />

fly through the air and strike you or a passenger.<br />

You could be injured or even killed. Secure<br />

all loose objects in the cab before moving the<br />

vehicle.<br />

Shifting The Transmission<br />

You will find a shift pattern either on a decal in your cab or<br />

on a medallion in the shift knob. Check to be sure you know<br />

the correct sequence for your particular transmission. Refer<br />

to the transmission manual included with your vehicle<br />

for complete instructions in the operation of your transmission.<br />

Shifting Gears in a New Vehicle<br />

Shift carefully in a new vehicle. The transmission may be a<br />

little stiff at first. So be careful to avoid gear clashing. When<br />

you are operating a new vehicle or one that has been exposed<br />

to cold weather, you want the transmission lubricant<br />

to circulate and coat the contacting surfaces of the gears.<br />

Metal contacting metal in moving parts may seriously damage<br />

your transmission. So don’t drive in one gear for long<br />

until the transmission lubricant has had a chance to coat<br />

those contacting surfaces.<br />

– 78 – Y53-6015 R(08/<strong>07</strong>)

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