Paccar Peterbilt 320 User manual

Quick Table of Contents
PART 1: INTRODUCTION.. ...............................................................................1
PART 2: CAB AND FRAME ACCESS................................................................6
PART 3: GETTING TO YOUR ENGINE...........................................................10
PART 4: CONTROLS AND DISPLAYS.. ..........................................................15
PART 5: SEAT AND RESTRAINT SYSTEMS..................................................57
PART 6: DRIVER’S CHECKLIST.. ...................................................................69
PART 7: STARTING & OPERATING THE VEHICLE.. .....................................73
PART 8: MAINTENANCE AND SERVICE.. ...................................................110
PART 9: VEHICLE IDENTIFICATION NUMBERS.. .......................................196
PART 10: CONSUMER INFORMATION.. ......................................................199
PART 11: SUBJECT INDEX...........................................................................202
Other Publications.. ........................................................................................206
California Proposition 65 Warning
• Diesel engine exhaust and some of its constituents are known to the State
of California to cause cancer, birth defects, and other reproductive harm.
• Other chemicals in this vehicle are also known to the State of California to
cause cancer, birth defects or other reproductive harm.
• Battery posts, terminals, and related accessories contain lead and lead com-
pounds, chemicals known to the State of California to cause cancer and re-
productive harm. Wash hands after handling.

PART1:INTRODUCTION HowToFindWhatYouWant
PART 1: INTRODUCTION
This manual contains useful information for the safe and
efficient operation of your Model 320. It also provides in-
formation on maintaining your vehicle in the best condition,
with an outline for performing safety checks and basic pre-
ventive maintenance inspections.
We have tried to present the information you’ll need to learn
about your vehicle’s functions, controls, and operation -
and to present it as clearly as possible. We hope you’ll
find this manual easy to use.
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.
Your Model 320 may not have all the features or options
mentioned in this manual. Therefore, you should pay care-
ful attention to the instructions that pertain to just your ve-
hicle. In addition, if your vehicle is equipped with special
equipment or options not discussed in this manual, consult
your dealer or the manufacturer of the equipment.
All information contained in this manual is based on the lat-
est production information available at the time of publica-
tion. Peterbilt Motors Company reserves the right to make
changes at any time without notice.
HowToFindWhatYouWant
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 informa-
tion 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 search-
ing 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.
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Additional Sources of Information PART 1: INTRODUCTION
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.
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 person-
nel to get you back on the road quickly - and keep you there.
Your vehicle is a complex machine. Anyone attempting re-
pairs 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 me-
chanic, 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 suf-
ficient 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. Ifyoudodecidetodoanycom-
plex 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 new Peterbilt 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 govern-
ments are sources for regulations which 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 in-
jury to yourself and your passengers as well as to prevent
costly damage to your vehicle. We’ve used certain sym-
bols 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 fol-
lows 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 suf-
ficient 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 en-
gine damage.
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Vehicle Safety PART 1: INTRODUCTION
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:
NOTE: A cold compressor can cause refrigerant to
liquefyandwarpthevalveplatesorcauseahy-
draulic 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 be-
fore 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 re-
flexes, perceptions, and judgment can be af-
fected by even a small amount of alcohol. You
could have a serious—or even fatal accident—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 cer-
tain medications will seriously impair percep-
tion, reactions, and driving ability. These cir-
cumstances 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 driv-
ing your Peterbilt vehicle. For that you need a good train-
ing program or truck driving school. If you have not been
trained, get the proper training before you drive. Only qual-
ified drivers should drive this vehicle.
Every new Peterbilt vehicle is designed to conform to all
Federal Motor Vehicle Safety Standards applicable at the
– 4 – Y53-6015 R(08/07)

PART 1: INTRODUCTION Vehicle Safety
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 capa-
bilities and the limits of its load ratings. See the axle and tire
load rating information located on the driver’s door jamb.
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PART 2: CAB AND FRAME ACCESS
PART 2: 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 danger-
ous. You could slip and fall, possibly suffering
a serious injury. Keep steps clean. Clean any
fuel, oil, or grease off of the steps before en-
tering 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 following pictures show the best way to enter and exit
a Model 320.
02871
Three points of contact as you begin or finish
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PART 2: CAB AND FRAME ACCESS Door Lock and Keys
02872
Three points of contact as you climb up or down
02873
Three points of contact as you step in or out
Door Lock and Keys
Doors can be locked from the inside by using the lock but-
ton. Close the door then push the button down to lock.
Doors automatically unlock when you open them from the
inside,andcanbelockedfromtheoutsidewithakeyonly.
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Climbing Onto the Deck Plate PART 2: CAB AND FRAME ACCESS
WARNING! To lessen the chance and/or sever-
ity of personal injury in case of an accident, al-
ways 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.
Climbing Onto the Deck Plate
WARNING!
• You can be hurt if you aren’t careful climb-
ing 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 deck plate– use
steps and grab handle 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.
NOTE: Any alteration (adding bulkheads, head-
ache racks, tool boxes, etc.) that affects the uti-
lization of grab handles, deck plates, or frame
access steps installed by Peterbilt must comply
with FMCSR 399.
– 8 – Y53-6015 R(08/07)

PART 2: CAB AND FRAME ACCESS Front Cab Guard/Ladder
Front Cab Guard/Ladder
The optional front cab guard/ladder is used on front-load-
ing refuse vehicles to protect the cab from damage and to
stand on in order to remove debris from above the cab.
0001
WARNING!
• Do not climb on the cab roof. The cab roof
is not a slip-resistant surface and is not
equipped with handholds. A slip and fall
could cause serious injury.
• Do not step or stand on the top rung of the
ladder. This is not a step; it is meant to used
only as a handhold. You could slip or fall and
injureyourselfifyouuseitasastep.
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Cab Tilting PART 3: GETTING TO YOUR ENGINE
PART 3: GETTING TO YOUR ENGINE
Cab Tilting
WARNING! You can be seriously injured by the
cab if you do not follow safety precautions.
Whenever you raise or lower the cab, or when
you work under the cab, please remember the
following safety rules:
• Be sure no one is under the front of the cab.
Whether you are raising or lowering the cab,
KEEP CLEAR.
• Never work under a raised cab unless it is
properly supported. This means use an over-
headhoistofsufficient capacity to support
the cab safely. Never prop the cab up instead
of using a hoist. The prop could fail and let
the cab fall on you or anyone else working
under the cab.
• Always be sure the safety latch is engaged
when you or anyone else works under the
cab.
• Perform work only when the cab is in the me-
chanically locked position or in the full tilt po-
sition.
• When your cab’s hydraulic system needs
service or repair:
• Have maintenance and repair done only by
someone qualified in hydraulic systems.
• Besurenoonetriestobleedthesystem
with the cab raised. This will defeat the
safety system. The cab can fall and crush
anyone under it.
• Do not tamper with any part of the cab tilt
cylinders, including removing the velocity
fuses. To do so will defeat their purpose.
The cab could fall and crush anyone under
it. If you have any need for repair involving
the velocity fuses, have a qualified truck
mechanic do the work.
NOTE: In case of oil loss in the system or a lockup
in the tilt cylinders, refer to the maintenance manual
for repair instructions.
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PART 3: GETTING TO YOUR ENGINE Raising the Cab
Raising the Cab
An independent hydraulic system raises and lowers the
cab. A positive, dual-locking device ensures safety and
eliminates danger of mishaps while driving.
WARNING! Do not get any part of your body un-
der an unsecured cab. It could cause a serious
or fatal accident. The cab could fall and crush
you. Always ensure the locking bar is fully en-
gaged before getting under the cab, or before
letting anyone else get under it (see following
instructions on using the locking bar).
WARNING!
• Raising the cab with heavy objects in the cab
can cause serious damage to the cab tilting
mechanism and cab. Before raising the cab,
remove heavy items such as tire chains and
tools. Remove or stow securely any loose
items. And shut the doors tightly.
• Straighten the front wheels before tilting the
cab or cab/tire damage could occur.
The following cab tilting instructions are labelled and in-
stalled on the base of the companion seat:
1. Park the vehicle on a level surface.
2. Apply the parking brake.
3. Make sure the shift lever is in Neutral. This will prevent
the shift lever from getting caught on the cab during
tilting operations.
4. Secure or remove all loose items in the cab. Close all
doors.
5. Check the clearance above and ahead of the cab. En-
sure there will be enough room to clear roof antennae
when you tilt the cab. Check for obstructions overhead
(branches, power lines, lights, etc.) and in front (walls,
work benches, other vehicles, etc.).
6. Place the control valve handle in the "Raise" position.
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Raising the Cab PART 3: GETTING TO YOUR ENGINE
02874
Handle in "Raise" Position
7. Attach pump handle to the pump and pump to raise the
cab (the latch hooks will release automatically when
pump is actuated). Pump until the locking bar can
be positioned on the anchor mounted below the right-
hand cab support as shown in the next illustration.
02875
Locking Bar in Anchored Position
8. Place the control valve handle in the “Lower” position
and allow the cab to settle down slightly on the locking
bar.
– 12 – Y53-6015 R(08/07)

PART 3: GETTING TO YOUR ENGINE Lowering the Cab
02876
Handle in "Lower" Position
02877
CabinFullTiltPosition
Lowering the Cab
1. Place the control valve handle in the "Raise" position
and pump until the locking bar can be removed from
the anchor and fastened in its stored position.
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Lowering the Cab PART 3: GETTING TO YOUR ENGINE
02878
Locking Bar In Stored Position
CAUTION: Do not try to pump the cab down
or hold it down with hydraulic force. If you
do, cab damage will occur.
2. Place the control valve handle in the "Lower" position.
The cab should settle down on the rear mounts.
02879
Upper and Lower Rear Cab Mount
3. Allow at least 20 seconds after the cab touches down
for the full spring force to develop in the latch hooks in
the rear mounts.
4. Remove the pump handle and store in the cab.
5. Visually inspect the cab latch hooks to ensure they are
closed.
6. Ensure that the control valve handle is in the “Lower”
position when operating the vehicle.
– 14 – Y53-6015 R(08/07)

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 that
follow.
Your Instrument Panel
Please remember that each Peterbilt is custom-made. Your
instrument panel may not look exactly like the one in the
illustrations on the pages that follow.
We have tried to describe all 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 PART 4: CONTROLS AND DISPLAYS
0002
Typical Instruments & Controls: Left-Hand Drive Station
LEFT SIDE
1. Turn Signal/Hazard Flasher
2. Accelerator Pedal
3. Brake Pedal
4. High Beam Switch
5. Clutch Pedal
6. Ignition Key Switch
7. Clearance Lamps Switch
8. SMC Select/Reset Switch
9. Headlight Switch
10. Voltmeter
11. Engine Oil Pressure
12. Engine Coolant Temperature
13. Tachometer
14. LED Warning Light Bar
15. Panel Light Knob
16. Speedometer w/ Message
Center (SMC)
17. Primary Air Pressure
18. Fuel
19. Transmission Oil Temp.
20. Secondary Air Pressure
21. Gearshift or Shift Selector
22. Heater Control Panel
23. Cigar Lighter
24. Interaxle Differential Lock
25. Parking Brake Valve
26. Windshield Wiper Valves
27. Windshield Washer Switch
– 16 – Y53-6015 R(08/07)