Peterbilt 387 Service Manual

4.5 (2)

PART 1: INTRODUCTION

HOW TO FIND WHAT YOU WANT

PART 1: INTRODUCTION

This manual contains useful information for the safe and efficient operation of your Peterbilt Model 387. It also provides information on maintaining your vehicle in the best condition, with an outline for performing safety checks and basic preventive maintenance inspections.

We have tried to present the information you’ll need to learn about your vehicle’s functions, controls, and opera- tion—and to present it as clearly as possible. We hope you’ll find this manual easy to use.

Please remember, though—this manual is not a training manual. It can’t tell you everything you need to know about driving your Peterbilt vehicle. For that you need a good training program or truck driving school. If you have not been trained, get the proper training before you drive. Only qualified drivers should drive this vehicle.

There will be times when you need to take this manual out of your Peterbilt. When you do, please be sure to return it to the cab when you are finished using it. That way it will be there when you need it the next time or when you pass the vehicle on to the next user.

How To Find What You Want

There are several tools built into this manual to help you find what you need quickly and easily.

First is the Quick Table of Contents. Located at the front of the manual, this lists the main subjects covered and gives page numbers where you can find these subjects. Use the Quick Table of Contents to find information on a large subject like “Maintenance.”

Cross-referenced citations also help you get the information you need. If some other part of the manual contains further information on the subject you are reading about, we’ll indicate that in a cross-reference like this: (See “PART 6: DRIVER’S CHECKLIST”). You won’t have to go searching for more information.

Finally you’ll find a helpful Subject Index. It’s in the back of the manual and alphabetically lists the subjects covered. So if you want information on brakes, for example, just look under Brake in the Subject Index. You’ll find all the pages listed where brakes or braking are discussed.

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A SPECIAL WORD ABOUT REPAIRS

PART 1: INTRODUCTION

A Special Word About Repairs

Your Peterbilt dealer’s service center is the best place to have your vehicle repaired. You can find Peterbilt dealers all over the country with the equipment and trained personnel to get you back on the road quickly—and keep you there.

Your vehicle is a complex machine. Anyone attempting repairs on it needs good mechanical training and the proper tools. If you are sure you have these requirements, then you can probably perform some repairs yourself. However, all warranty repairs must be performed by an authorized Peterbilt service facility. If you aren’t an experienced mechanic, or don’t have the right equipment, please leave all repairs to an authorized service facility. They are the ones equipped to do the job safely and correctly.

WARNING! Attempting repair work without sufficient training, service manuals, and the proper tools can be dangerous. You could be injured or you could make your truck unsafe. Do only those tasks you are fully qualified to do.

Maintenance Manuals. If you do decide to do any complex repair work, you’ll need the Peterbilt Maintenance manuals. Order them from your authorized dealer. Please provide your Chassis Serial Number when you order, to be sure you get the correct manuals for your vehicle. Allow about four weeks for delivery. There will be a charge for these manuals.

Final Chassis Bill of Material. A complete, nonillustrated computer printout listing of the parts used to custom-build your Peterbilt vehicle is available through the Peterbilt dealer from whom your purchased your vehicle.

WARNING! Modifying your vehicle can make it unsafe. Some modifications can affect your truck’s electrical system, stability, or other important functions. Before modifying your vehicle, check with your dealer to make sure it can be done safely.

Additional Sources of Information

Operator’s manuals are also supplied by the manufacturers of components such as the engine, seats, transmission, and radio in your Peterbilt. If you are missing any of these manuals, ask your Peterbilt dealer to supply them.

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PART 1: INTRODUCTION

WARNINGS

Your Model 387’s glove box also contains a copy of the

Truck Driver’s Handbook, published by the American Trucking Association. Refer to it for important information on driving your vehicle. Another place to learn more about trucking is a local truck driving school. Contact one near you to find out what kinds of instruction it offers.

Federal and state agencies also have information you can ask for. The Interstate Commerce Commission can give you information about regulations governing transportation across state lines. And various agencies in state governments are sources for regulations that differ from state to state.

Warnings

We’ve put a number of warning messages in this manual. They are there for your protection and information. Please read them and follow them. They can help you to avoid injury to yourself and your passengers as well as to prevent costly damage to your vehicle. We’ve used certain symbols and “signal words” to indicate what kind of message is going to follow. When you see these symbols & words, you know that you need to pay special attention. Please don’t ignore any of these signals.

WARNING! When you see this symbol & word, the message that follows is especially vital. This signals something that can cause serious injury or death. This message will tell you what the hazard is, what can happen if you don’t heed the warning, and how to avoid it. For example:

WARNING! Attempting repair work without sufficient training, service manuals, and the proper tools can be dangerous. You could be injured or you could make your vehicle unsafe. Do only those tasks you are fully qualified to do.

CAUTION: This symbol & word signals something that could damage your vehicle. You might receive an injury, too. For example:

CAUTION: Continuing to operate a vehicle with insufficient oil pressure will cause serious engine damage.

NOTE: Gives you information we feel you’d like to have. It could have to do with care of your vehicle or with driving more efficiently:

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VEHICLE SAFETY

PART 1: INTRODUCTION

NOTE: A cold compressor can cause refrigerant to liquefy and warp the valve plates or cause a hydraulic lock. Warm the engine before starting the air conditioner.

Please take the time to read these messages when you see them. And remember:

WARNING! Something that could injure you seriously.

CAUTION: Something that could cause injury to you or your vehicle.

NOTE: Useful information.

Vehicle Safety

Make sure your Peterbilt is in top working condition before heading out on the road—it is the responsible driver's duty to do so. Inspect the vehicle according to “PART 6: DRIVER’S CHECKLIST”.

WARNING! Do not drink and drive. Your reflexes, perceptions, and judgment can be affected by even a small amount of alcohol. You could have a serious—or even fatal acci- dent—if you drive after drinking. Please do not drink and drive or ride with a driver who has been drinking.

WARNING! The use of alcohol, drugs, and certain medications will seriously impair perception, reactions, and driving ability. These circumstances can substantially increase the risk of an accident and personal injury.

Please remember, this manual is not a training manual. It cannot tell you everything you need to know about driving your Peterbilt vehicle. For that you need a good training program or truck driving school. If you have not been trained, get the proper training before you drive. Only qualified drivers should drive this vehicle.

Every new Peterbilt vehicle is designed to conform to all Federal Motor Vehicle Safety Standards applicable at the time of manufacture. However, even with these safety features, continued safe and reliable operation depends greatly upon regular vehicle maintenance. The vehicle must be operated within the range of its mechanical capabilities and the limits of its load ratings. (See the Tire and Rim Weight Ratings label on the driver's door edge.)

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PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

Be careful whenever you get into or out of your vehicle’s cab. Always maintain at least three points of contact with your hands on the grab handles and your feet on the steps.

WARNING! Jumping out of the cab or getting into the cab without proper caution is dangerous. You could slip and fall, possibly suffering a serious injury. Keep steps clean. Clean any fuel, oil, or grease off of the steps before entering the cab. Use the steps and grab handles provided, and always keep at least three points of contact between your hands and feet and the truck. Look where you are going.

The illustrations that follow show the best ways to enter and exit a cab.

02958-A

Vehicle With External Grab Handle

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DOOR LOCK AND KEYS

PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

02958-B

Vehicle Without External Grab Handle

Door Lock and Keys

Doors can be locked from the inside by using the lock button. Close the door then push the button down to lock. Doors automatically unlock when you open them from inside, and can be locked from the outside with the key only.

WARNING! To lessen the chance and/or severity of personal injury in case of an accident, always lock the doors while driving. Along with using the lap/shoulder belts properly, locking the doors helps prevent occupants from being thrown from the vehicle.

To lock or unlock the doors from outside the cab, insert the key in the lock. Turn the key toward the rear to lock; forward to unlock.

Remote Keyless Entry (optional)

This vehicle may be equipped with a Remote Keyless Entry (RKE) system that adds security and convenience to your vehicle. The system will lock or unlock the driver’s door and passenger’s door with the key fob and alert you with parking lights when the selected door’s are locked or unlocked. The system includes two key fobs that provide secure rolling code technology that prevents someone from recording the entry signal.

Operation

To Unlock The Driver’s Door

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PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

DOOR LOCK AND KEYS

Press the UNLOCK button once. The driver's door will

2.

Remove the battery.

 

unlock and the parking lights will come on for 40 sec-

3.

Install new battery.

 

onds.

 

 

 

 

To Unlock The Passenger’s Door

Press the UNLOCK button once and press again within 5 seconds. The passenger door will unlock.

To Lock Both Doors

Press the LOCK button. The doors will lock and the parking lights will come on for 2 seconds. If the doors are open they will not lock. The range of the RKE system should be approximately 30 ft. This will be reduced if it is operated close to other RF sources such as TV/radio transmitters and cell towers.

Batteries

4.Reinstall cover.

5.Synchronize the key fob.

Synchronization

The key fob may need to be synchronized to the truck when the battery is replaced or when the key fob has not been used for an extended period time.

To Synchronize A Key Fob

1. Hold the key fob near the receiver.

NOTE: The receiver is located behind the Speedometer/Tachometer cluster assembly.

The key fob uses one CR2032, 3V battery. Batteries should last approximately three years, depending on use. Consistently reduced range is an indicator that the battery needs replacement. Batteries are available at most discount, hardware and drug stores.

To Replace The Battery

1. Remove rear cover from key fob.

2.Press and hold both the Lock and Unlock buttons at the same time for approximately 7 seconds.

3.When the key fob is resynchronized, the doors will lock then immediately unlock.

4.If the fob fails to synchronize, it could be programmed to a different truck or could have failed. Contact your dealer to re-program your key fob.

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CLIMBING ONTO THE DECK PLATE

PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

Climbing Onto the Deck Plate

When you are climbing onto and off the deck plate, maintain at least three points of contact with your hands on the grab handles and your feet on the steps.

WARNING!

You can be hurt if you aren’t careful climbing onto and off the deck plate. You can slip and fall, especially if the surfaces are wet or icy, or if you step in oil, fuel, or grease. Keep steps clean. Always maintain at least three points of contact between your hands and feet and the steps and deck plate.

Do not climb onto and off the deckplate–use steps and grabhandle provided. If there is no deck plate, or if proper steps and grab handles aren’t provided, don’t climb onto the area behind the cab. Peterbilt did not intend for the area to be a step if handrails or proper steps are not provided.

WARNING! Do not step on vehicle components without antiskid surfaces or use components not designed for entry-and-exit use. You could fall and injure yourself if you step on a slippery surface. For example:

You could fall and injure yourself if you step onto a fuel tank surface. A fuel tank is not a step. The tank surface can get very slippery, and you might not be able to prevent a fall. Don’t step onto the surface of a fuel tank. Use only the steps and handholds provided, not chain hooks, quarter fenders, etc.

Always reinstall steps before entering the cab or accessing the deck plate. Without steps, you could slip and fall, resulting in possible injury to yourself.

NOTE: Any alteration (adding bulkheads, headache racks, tool boxes, etc.) behind the cab or sleeper that affects the utilization of grab handles, deck plates, or frame access steps installed by Peterbilt must comply with FMCSR 399.

The pictures that follow show you the right way to get on and off the area behind your cab.

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Peterbilt 387 Service Manual

PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

CLIMBING ONTO THE DECK PLATE

Hold handles as you step up

Three points of contact as you reach the deck area

 

Three points of contact

Three points of contact as you step to the deckplate

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CLIMBING ONTO THE DECK PLATE

PART 2: GETTING INTO & OUT OF THE CAB AND FRAME ACCESS

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PART 3: GETTING TO YOUR ENGINE

HOOD TILT

PART 3: GETTING TO YOUR ENGINE

Hood Tilt

Follow this procedure to tilt the hood.

WARNING! Before opening or closing the hood, be sure there are no people or objects in the way. A hood could hurt someone in the way of its opening or descent.

1.To open your hood, find the hood release handle on the cab floor beside the driver’s seat.

Hood release handle

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HOOD TILT

PART 3: GETTING TO YOUR ENGINE

2.Grasp the lever and turn it towards you. The hood will release and pop open to a neutral position, approximately 2” above the closed position.

WARNING! The hood uses hydraulic dampers to control movement during opening. Do not tilt the hood with these dampers disconnected. Replace damaged, worn, or leaking dampers as soon as possible. Tilting a hood with the dampers disconnected or defective may cause the hood to tilt too rapidly. You could be injured and the hood could be damaged.

3.Proceed to the front of the vehicle and face the hood. Grasp the hood ornament on the top of the crown molding. Pull forward and down until the hood is fully open and rotation stops.

WARNING! If the hood falls, anyone under it could be injured. Always ensure that a hood is fully tilted open any time anyone gets under a hood for any reason.

4.To close the hood, firmly push upward and rearward on the hood ornament to start the hood tilting backwards. Continue to push until the hood moves through its neutral position. The hood will continue to tilt backwards. Apply a firm push to the hood ornament to engage the hood latches located on both sides of the firewall.

WARNING! If the hood is not latched securely, it could open during operation and cause an accident. Be sure the hood is latched securely before moving the vehicle.

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PART 4: CONTROLS AND DISPLAYS

YOUR INSTRUMENT PANEL

PART 4: CONTROLS AND DISPLAYS

This part explains the location of the various features on your vehicle and describes their function. For information on using these features in driving, see the paragraphs below.

Your Instrument Panel

Please remember that each Model 387 is custom-made. Your instrument panel may not look exactly like the one in the pictures that follow.

We have tried to describe the most common features and controls available, so your vehicle may not have some of the ones that appear in this section. You can pick out the parts that apply to you and read them to be fully informed on how your particular vehicle operates.

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YOUR INSTRUMENT PANEL

Typical Cab Instruments and Controls

6

7

8

9

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

 

 

 

14

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

 

 

 

 

 

 

 

2

 

1

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02971B

PART 4: CONTROLS AND DISPLAYS

LEFT SIDE

1.

ID/Clearance Lamps Switch

10.

Air Cleaner Restriction

2.

Ignition Switch

11.

Primary Air Pressure

3.

Headlamps Switch

12.

Secondary Air Pressure

4.

Voltmeter

13.

Fuel

5.

Oil Pressure

14.

SMC Select/Reset Switch

6.

Tachometer

15.

Dome Light Switch

7.

Warning Light Bar

16.

Windshield Wiper/Washer

8.

Speedometer-Message

17.

Panel Dimmer

 

Center (SMC)

 

 

9.

Water Temperature

18.

Cigarette Lighter

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PART 4: CONTROLS AND DISPLAYS

YOUR INSTRUMENT PANEL

8

7

 

11

12

14

16

17

RIGHT SIDE

 

10

 

 

 

13

15

 

1.

Parking Brake Valve

12. Engine Brake

9

 

 

 

 

 

 

 

 

 

 

2.

Trailer Air Supply Valve

13. Engine Brake

 

 

 

 

 

 

3.

Heater/AC Control Panel

14. Load Lights Switch

 

 

 

 

 

 

4.

Fog Lights Switch

15. Interaxle Differential Lock

 

 

 

 

 

 

 

 

Switch

 

 

 

 

 

18

5.

Engine Fan Switch

16. 5th Wheel Lock Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.

ID/Clearance Lamps Flash

17. Air Suspension Switch

 

 

 

 

 

 

 

Switch

 

 

 

 

 

 

19

7.

Trailer Brake Lever

18. Radio

6

 

 

 

 

 

 

 

 

 

 

8.

Cruise Control Switch

19. CB Radio

 

 

 

 

 

 

5

 

 

 

 

20

9.

Transmission Temperature

20. Selected Option Switch

 

 

 

 

 

 

 

 

 

 

21

10.

Cruise Control Switch

21. Mirror Heater Switch

 

 

 

 

 

 

 

 

4

 

 

 

 

 

11.

Pyrometer

 

 

3

 

 

 

 

 

 

 

 

 

2

1

 

 

 

 

 

 

 

 

 

 

02972A

 

 

 

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STEERING COLUMN-MOUNTED CONTROLS

PART 4: CONTROLS AND DISPLAYS

Steering Column-Mounted Controls

Turn Signal and Indicator Lights

Turn Signal

Your turn signal lever is mounted on the left side of the steering column below the steering wheel. Green directional indicator lights appear on the instrument panel.

NOTE: The ignition key must be turned to ON for the signal/switch to operate.

To operate the signal, move the lever in the direction of the turn.

WARNING! After you complete a turn, shut the system off by returning the lever to the “OFF” (center) position. The switch's lever action is NOT self-canceling. Failure to shut off a turn signal could confuse other drivers and result in an injury accident. An indicator light in the instrument panel will flash until the turn signal is turned off.

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PART 4: CONTROLS AND DISPLAYS

STEERING COLUMN-MOUNTED CONTROLS

Hazard Flasher

Hazard Flasher

The four-way Hazard Flasher switch is on the turn signal body, just underneath the turn signal lever. It will operate with the key switch in the ON or OFF position. Use your hazard flasher whenever you are off the road or on the side of the road, or in a potentially hazardous situation.

Pull it out to activate the system. All turn signals will flash at once. To turn it off, move the turn signal lever up or down.

WARNING! Use your Hazard Flasher Warning System any time you have to stop off the road or on the side of the road, day or night. A hard-to-see vehicle can result in an injury accident. Another vehicle could run into you if you do not set your flashers. Always move the vehicle a safe distance off the road when stalled or stopped for repairs.

Of course, in normal stopping in traffic, such as at a stop light, you do not use your flashers.

WARNING! Your disabled vehicle can be dangerous for you and others. The hot exhaust system could ignite dry grass, spilled fuel, or other substances. Do not park or operate your vehicle where the exhaust system could contact dry grass, brush, spilled fuel, or any other material that could cause a fire.

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STEERING COLUMN-MOUNTED CONTROLS PART 4: CONTROLS AND DISPLAYS

High Beam Headlights

Electric Horn

 

 

Your Peterbilt has an electric horn. To sound the horn,

 

 

 

 

press on the bar in the center of the steering wheel

 

 

 

 

 

 

 

 

 

 

High Beam Headlight Switch

All Peterbilt vehicles come equipped with a combination turn signal and high beam/low beam switch. To switch your headlights lower or higher, gently pull the turn signal lever up, towards the steering wheel, until you hear the switch “click” and the beam changes.

Electric Horn Bar

Air Horn

Your Model 387 has an air horn in addition to an electric horn. Control the air horn by pulling on the lanyard extending from the overhead header panel.

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PART 4: CONTROLS AND DISPLAYS

STEERING COLUMN-MOUNTED CONTROLS

Trailer Brake Hand Valve

02975A

This hand valve provides air pressure to apply the trailer brakes only. It operates independently of the foot treadle valve.

NOTE: The trailer brake is not to be used as the main means of braking. To use this brake frequently instead of using the foot brake will wear out the trailer brake sooner.

To operate the trailer brake hand valve: pull down on the lever under the right side of the steering wheel.

See the Index, under Brake Safety and Emergency for more complete information on when and how to use your trailer brake

WARNING!

It is dangerous to use air-applied trailer brakes for parking or holding a vehicle. Air system pressure can bleed down and release the brakes. You could have a vehicle roll-away resulting in an accident. You or others could be badly injured. Always apply the parking brakes for parking or holding your vehicle on grade.

Grabbing the trailer brake hand lever instead of the BrakeSaver lever could lead to an accident. If you have these levers, they may be close together on your steering wheel column. Be sure you get the one you want. The BrakeSaver lever is bent, while the trailer parking brake lever is straight.

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TILT-TELESCOPING STEERING COLUMN

PART 4: CONTROLS AND DISPLAYS

Tilt-Telescoping Steering Column

Tilt-Telescope Lever

The telescoping feature of the steering wheel allows forward and rearward movement of the wheel. The tilting feature allows you to move the wheel up and down.

WARNING! Adjusting the Tilt-Telescoping Steering Wheel while the vehicle is in motion could cause loss of control. You would not be able to steer properly and could have an accident. Make all adjustments to the steering mechanism while the vehicle is stopped.

To position the wheel: Locate the Tilt-Telescope Lever on the floor, to the left of the steering column. Push this lever toward the floor. Move the steering wheel to the desired angle and height. Release the lever to lock in the correct position.

Dash-Mounted Features

Keys and Locks

The same key fits your ignition, doors, and sleeper luggage compartment. Frame-mounted tool box locks, locking fuel tank caps, and glove boxes each have individual keys.

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PART 4: CONTROLS AND DISPLAYS

DASH-MOUNTED FEATURES

Ignition Switch

OFF

ACC ONLY

IGN & ACC

START

02977A

Your ignition switch has four positions:

ACC (Accessory): With your key in this position you can play the radio or use other accessories, but your engine won’t start.

OFF: In this position all systems are off, and you can remove your key.

IGN & ACC: This position allows you to turn on the engine and all accessory power.

START: Starter activation to start engine.

Headlights

02890

The headlights are controlled by the control panel switch showing this symbol. When the headlights are ON, the dash lights, side, and tail lamps are also on.

NOTE: On vehicles equipped with daytime running lights (DRL), the inboard park-and-turn lamps go on automatically at reduced brightness if the engine is running and the headlamp switch is turned off. The daytime running lights are turned off automatically while the parking brake is engaged.

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DASH-MOUNTED FEATURES

PART 4: CONTROLS AND DISPLAYS

WARNING! Do not use daytime running lights (DRL) during periods of darkness or reduced visibility. Do not use DRL as a substitute for headlights or other lights during operations that require lighting of your vehicle. Doing so could lead to an injury accident.

Panel Light Knob

02891

The Panel Light Knob lets you vary the brightness of your instrument panel lights.

To Operate Your Panel Light Knob:

1.Turn on either the headlights, clearance lights, or fog/ driving lights with IGN on.

2.To brighten the instrument panel lights, turn the knob clockwise (to the right).

3.To dim the instrument lights or to turn them off, turn the knob counterclockwise (to the left).

ID and Clearance Lights Switches

These are the amber lights on top of your cab, the lights on the front and sides of the trailer and the red lights on the rear of a truck or trailer. They may be turned on and off by the switch located on the lower left control panel labeled CL LPS and showing the symbol below.

02892

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PART 4: CONTROLS AND DISPLAYS

DASH-MOUNTED FEATURES

When your clearance lights are turned on, you may blink or flash them by operating the flash switch located on the right side of the dash showing the symbol below. Press and release this rocker switch to flash your clearance lights.

03912-1

Fog/ Driving Lights Switch

I

O

03021

If your vehicle has fog/driving lights, turn them ON or OFF with the control panel switch shown above.

NOTE: State requirements vary as to when high beams and fog lights can and cannot be used together. Further, some states allow only four lights to be used together; some allow more. Whether you have dual or composite lights will affect how many lights you can have on at one time. Always comply with the state requirements where you are driving.

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DASH-MOUNTED FEATURES

PART 4: CONTROLS AND DISPLAYS

Dome Light Switch

I

O

02894A

A momentary switch controls the main dome light:

OFF (O) Position: Light is off.

ON (I) Position:

Press once: Light will turn on at high intensity.

Press again: Light will shift to low intensity.

– Press a third time: Light will turn off.

Windshield Wipers and Washers

02896

Wiper

To turn on the wipers rotate the knob to the right. As the knob is rotated, the speed of the wipers increases. To turn off the wipers, rotate the knob to the left.

Washer

To use the washer, push the knob showing the symbol above. With the electric wipers, the wipers will come on for a short time when the washer starts.

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PART 4: CONTROLS AND DISPLAYS DASH-MOUNTED FEATURES

WARNING! Do not drive with worn or dirty Air Suspension Deflate Switch (Dump Valve)

wiper blades. They can reduce visibility, making driving hazardous. Clean blades regularly

to remove road film and wax build-up. Use an alcohol-based cleaning solution and a lint-

free cloth, and wipe along the blades.

CAUTION: Do not use antifreeze or engine coolant in the windshield washer reservoir— damage to seals and other components will result.

Intermittent Windshield Wiper Control

AIR SUSPENSION

03035

Two-speed intermittent windshield wipers are controlled by the control panel knob with the symbol shown above. To turn on the wipers, rotate the knob to the right.

As you turn the knob further to the right, intermittent delay decreases until the knob encounters the first position for continuous operation. Turn the knob further right to the next position for higher speed continuous operation. Turn off the wipers by rotating the knob to the left.

Your Model 387 may have an air suspension deflation switch that allows the air in the suspension to be exhausted from a switch on the dash. The purpose of this feature is to allow you to lower your tractor to get under a trailer. You will notice a guard over the switch. This prevents you from accidentally deflating the suspension.

WARNING! Operating the Air Suspension Deflate Switch (Dump Valve) while driving can lead to an accident. Sudden deflation while your vehicle is moving can affect handling and control. Use this switch only when your vehicle is not moving.

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DASH-MOUNTED FEATURES

PART 4: CONTROLS AND DISPLAYS

CAUTION: Operating a vehicle with air suspension bags either overinflated or underinflated may cause damage to driveline components. If a vehicle must be operated under such conditions, do not exceed 5 mph.

Engine Fan Switch

I

0

03023

The engine fan switch allows you to control the engine fan manually or automatically. With the ignition key switch ON and the fan switch in the ON position, the engine fan will be on regardless of engine temperature. With the engine

fan switch in the AUTOMATIC position, the engine fan will automatically turn on when the engine coolant reaches a temperature of about 200°F.

WARNING! Do not work on the fan with the engine running. Anyone near the engine fan when it turns on could be badly injured. If it is set at ON, it will turn on any time the ignition key switch is turned to the ON position. In AUTOMATIC, it could engage suddenly without warning. Before turning on the ignition or switching from AUTOMATIC to ON, be sure no one is near the fan.

CAUTION: The fan or equipment near it could be damaged if the fan turns on suddenly when you don’t expect it. Keep all tools and equipment such as rags away from the fan, and take care no one turns on the ignition when someone is working near the fan.

CAUTION: Do not operate the engine fan in the manual (ON) position for extended periods of time. The fan hub was designed for intermittent operation. Sustained operation will shorten the fan hub’s service life as well as reduce fuel economy.

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PART 4: CONTROLS AND DISPLAYS

DASH-MOUNTED FEATURES

Mirror Heat Switch

Power Mirror Switch

I

O

03022

Mirror heat is controlled by the control panel switch shown above. If the vehicle is equipped with this switch, mirror heat can be switched on to help remove frost and ice from the mirror glass.

The power mirror control controls the adjustment of the right or left outside mirrors, depending on the option selected. It is located in the driver side armrest.

NOTE: The Power Mirror Switch does not control the adjustment of the convex mirrors.

WARNING! Convex mirrors can distort images and make objects appear smaller and farther away than they really are. You could have an accident if you are too close to another vehicle or other object. Keep plenty of space between your vehicle and others when you turn or change lanes. Remember that other objects are closer than they may appear.

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PART 4: CONTROLS AND DISPLAYS

Cruise Control Switch

I

SET

CRUISE

CRUISE

ON/OFF

SELECT

0

RESET

03025

03026

The master switch turns the cruise control ON or OFF. The second switch allows you to SET the desired speed or RESET the desired speed after the cruise control function has been interrupted.

WARNING! Do not operate the cruise control when operating on road surfaces with poor traction (wet, icy, or snow covered roads) or in heavy traffic. Accelerations caused by the normal operation of the cruise control could cause you to lose control of the vehicle resulting in an injury accident.

NOTE: Cruise control functions and features may vary depending upon which engine you have. For

specific explanation of your cruise control, see the cruise control or engine manual included with your vehicle.

Engine Brake

03028

When an engine brake is energized, the power-producing diesel engine is converted into a power-absorbing air compressor to retard the vehicle.

The brake is energized whenever the driver’s foot is completely removed from the accelerator pedal.

The brake is deenergized during driving by pressure on the accelerator pedal, and during shifting by depressing the clutch pedal.

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PART 4: CONTROLS AND DISPLAYS

DASH-MOUNTED FEATURES

The ON/OFF toggle switch turns the system ON or OFF.

In Caterpillarand Cummins-powered vehicles equipped with a Jacobs Engine Brake, a second twoor three-mode switch is incorporated in the instrument panel. With this system, you can select either LOW or HIGH or LOW/MEDIUM/HIGH retarding.

For more information on when and how to use the engine brake in your vehicle, see the owner’s manual for the engine brake.

WARNING! Using the engine brake when operating on surfaces with poor traction (such as wet or icy, slippery roads or gravel) could cause loss of control.

Two-Speed Rear Axle (Range) Switch

2

03030

If your vehicle is equipped with a two-speed rear axle, you can select the axle range by the dash mounted switch shown above.

The low range provides maximum torque for operating off-highway.

The high range is a faster ratio for highway speeds.

For information on how to operate your two-speed rear axle properly and safely, see “PART 7: STARTING & OPERATING THE VEHICLE”.

Interaxle Differential Lock Switch

SHIFT AT ANY SPEED EXCEPT

IF A WHEEL IS SPINNING

03029

The interaxle differential allows differential action between the forward rear and the rear rear driving axles. The interaxle differential lock switch allows the operator to LOCK or

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DASH-MOUNTED FEATURES

PART 4: CONTROLS AND DISPLAYS

UNLOCK the differential. The guard over this switch prevents you from accidentally activating the lock. See “Interaxle Differential” on page 81 for more information on using your interaxle differential.

WARNING! Placing the differential lock in the “LOCK” position while your wheels are spinning could cause loss of control or axle damage. You could be hurt. Switch to “LOCK” only when your wheels are not spinning.

Fifth Wheel Lock (Slider Adjustment) Switch

0 1

CAB CONTROL

03031

Vehicles having an air slide fifth wheel have a fifth wheel slider lock controlled by a switch on the instrument panel. By placing the switch in the unlock position, you can slide the fifth wheel to various positions to adjust weight distribution. There is a guard over this switch to protect you against accidentally activating or releasing the lock.

WARNING! Do not move the fifth wheel while the tractor-trailer is in motion. Movement of the fifth wheel while a tractor-trailer is moving can cause a serious accident. Your load could shift suddenly, causing you to lose control of the vehicle. Never operate the vehicle with the switch in the unlock position. Always inspect the fifth wheel after you lock the switch to be sure the fifth wheel is engaged.

CAUTION: Both the fifth wheel plate and the slide tracks (if a slider) should be cleaned and lubricated periodically to ensure smooth turning and sliding action. Failure to keep these surfaces lubricated can lead to frame or driveline damage.

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