
HEAVY-DUTY TRUCKS SERVICE MANUAL
Models: FLA COE
FLB COE
FLD Conventional
FLL COE
STI-206, S39 (8/10P)

For an example of a Heavy-Duty Trucks Service Manual page, see Fig. 1.
B C A
FG D E 02/11/98 f020022
A. Section Title
B. Section Number (made up of the Group Number—first two digits, followed by a sequence number—last two digits)
C. Subject Title
D. Manual Title
E. Release (Supplement) Date
F. Subject Number
G. Subject Page Number
Fig. 1, Example of a Heavy-Duty Trucks Service Manual Page
Introduction
Page Description
Heavy-Duty Trucks Service Manual, Supplement 39, July 2010 I–3

Group No. Group Title
00 ...................... General Information
01 ................................ Engine
09 .............................. Air Intake
13 ......................... Air Compressor
15 ................... Alternators and Starters
20 ................... Engine Cooling/Radiator
25 ................................ Clutch
26 ........................... Transmission
30 ......................... Throttle Control
31 ............. Frame and Frame Components
32 ............................ Suspension
33 ............................. Front Axle
35 ............................. Rear Axle
40 ........................ Wheels and Tires
41 .............................. Driveline
42 ................................ Brakes
46 ............................... Steering
47 ................................. Fuel
49 ............................... Exhaust
54 .......... Electrical, Instruments, and Controls
60 .................................. Cab
72 ................................ Doors
82 ............. Windshield Wipers and Washer
83 ................. Heater and Air Conditioner
88 .............. Hood, Grille, and Cab Fenders
90 ................. Fire Suppression Systems
91 ............... Seats and Restraint Systems
98 ................................. Paint
Introduction
Service Manual Contents
I–4 Heavy-Duty Trucks Service Manual, Supplement 39, July 2010

The following is a list of definitions for abbreviations and symbols used in Freightliner publications.
A .......... amperes
ABS ....... antilock braking system
ABS ....... acrylonitrile-butadiene-styrene
A/C ........ air conditioner
AC ......... alternating current
acc ........ accessories
ACPU ..... air conditioning protection unit
ADLO ..... auto-disengagement lockout
AGM ....... absorbed glass mat
AGS ....... automated gear shift
a.m. ....... ante meridiem (midnight to
noon)
AM ........ amplitude modulation
amp(s) .... ampere(s)
AMT ....... automated mechanical
transmission
AMU ....... air management unit
ANSI ...... American National Standards
Institute
API ........ American Petroleum Institute
API ........ application programming
interface
ARI ........ Air Conditioning and
Refrigeration Institute
ASA ....... American Standards
Association
ASF ....... American Steel Foundries
ASR ....... automatic spin regulator
assy . ...... assembly
ASTM ..... American Society for Testing
and Materials
ATC ....... automatic temperature control
ATC ....... automatic traction control
ATC ....... automatic transmission
control
ATD ....... aftertreatment device
ATF ........ automatic transmission fluid
ATS ....... aftertreatment system
attn ........ attention
aux. ....... auxiliary
av ......... avoirdupois (British weight
system)
AWD ....... all-wheel drive
AWG ...... American wire gauge
AWS ....... American Welding Society
BAT ....... battery
BBC ....... bumper-to-back-of-cab
BHM ....... bulkhead module
BOM ....... bill of material
BTDC ...... before top dead center
Btu(s) ..... British thermal unit(s)
C .......... common (terminal)
CAC ....... charge air cooler
CAN ....... controller area network
CARB ..... California Air Resources
Board
CAT ....... Caterpillar
CB ......... circuit breaker
CB ......... citizens’ band
CBE ....... cab behind engine
CCA ....... cold cranking amperes
CD-ROM .. compact-disc/read-only
memory
CDTC ...... constant discharge
temperature control
CEL ....... check-engine light
CFC ....... chlorofluorocarbons
(refrigerant-12)
cfm ........ cubic feet per minute
CFR ....... Code of Federal Regulations
CGI ........ clean gas induction
CHM ....... chassis module
CIP ........ cold inflation pressure
CLS ....... coolant level sensor
cm ......... centimeters
cm
3
........ cubic centimeters
CMVSS .... Canadian Motor Vehicle
Safety Standard
Co. ........ company
COE ....... cab over engine
Corp. ...... corporation
CPU ....... central processing unit
CRT ....... cathode ray tube
cSt ........ centistokes (unit of
measurement for describing
the viscosity of general
liquids)
cu ft ....... cubic feet
cu in ...... cubic inches
CUM ....... Cummins
CWS ....... collision warning system
DC ......... direct current
DDA ....... Detroit Diesel Allison (obs)
DDC ....... Detroit Diesel Corporation
DDDL ...... Detroit Diesel Diagnostic Link
DDE ....... Detroit Diesel Engines
DDEC ..... Detroit Diesel Electronic
(engine) Control
DDR ....... diagnostic data reader
DDU ....... driver display unit
def ........ defrost
DEF ....... diesel exhaust fluid
DFI ........ direct fuel injection
DGPS ..... differential global positioning
system
dia. ........ diameter
DIAG ...... diagnosis
DIP ........ dual inline package (switch)
DLA ....... datalink adaptor
DLM ....... datalink monitor
DLU ....... data logging unit
DMM ...... digital multimeter
DOC ....... diesel oxidation catalyst
DOT ....... Department of Transportation
DPF ....... diesel particulate filter
DRL ....... daytime running lights
DRM ....... dryer reservoir module
DSM ....... district service manager
DTC ....... diagnostic trouble code
DTC ....... discharge temperature control
DVOM ..... digital volt/ohm meter
ea. ......... each
EBS ....... electronic braking system
ECAP ...... electronic control analyzer
programmer
ECAS ...... electronically controlled air
suspension
ECI ........ electronically controlled
injection
ECL ....... engine coolant level
ECM ....... electronic control module
ECT ....... engine coolant temperature
ECU ....... electronic control unit
EDM ....... electronic data monitor
EEPROM . . electrically erasable
programmable read-only
memory
EFPA ...... electronic foot pedal
assembly
EGR ....... exhaust gas recirculation
ELC ....... extended-life coolant
EMC ....... electromagnetic compatibility
EMI ........ electromagnetic interference
EOA ....... electric over air
EP ......... extreme pressure (describes
an antiwear agent added to
some lubricants)
List of Abbreviations 00.01
List of Abbreviations
Heavy-Duty Trucks Service Manual, Supplement 38, July 2009 050/1

EPA ....... Environmental Protection
Agency
EPS ....... engine position sensor
ESD ....... electrostatic discharge
ESS ....... engine syncro shift
(transmission)
etc. ........ et cetera (and so forth)
ETEC ...... electronic truck engine control
EUI ........ electronic unit (fuel) injectors
EXM ....... (chassis) expansion module
FAS ....... Freightliner air suspension
FET ........ field effect transistor
Fig. ........ figure
fl oz ....... fluid ounces
FLA ....... post-1984 advancements
Freightliner COE
FLB ....... enhanced Freightliner FLA
COE
FLC ....... steel-cab Freightliner 112
Conventional
FLD ....... post-1984 advancements
Freightliner 112/120
aluminum-cab Conventional
FM ......... frequency modulation
FMCSA .... Federal Motor Carrier Safety
Administration
FMEA ..... failure mode effects analysis
FMI ........ failure mode indicator
FMSI ...... Friction Materials Standards
Institute
FMVSS .... Federal Motor Vehicle Safety
Standard
FRP ....... fiberglass reinforced plastic
FSA ....... field service authorization
FSM ....... fleet service manager
ft .......... feet
ft
3
......... cubic feet
ft
3
/min ..... cubic feet per minute
FTL ........ Freightliner
F.U.E.L. .... fuel usage efficiency level
g .......... grams
gal ......... gallons
GAWR ..... gross axle weight rating
GL ......... gear lubricant
GND ....... ground
gpm ....... gallons per minute
GPS ....... global positioning system
GVWR ..... gross vehicle weight rating
HCOE ..... high cab over engine
HCU ....... hydraulic control unit
HD ......... heavy-duty
HEPA ...... high-efficiency particulate air
(filter)
HEST ...... high exhaust system
temperature
HEV ....... hybrid electric vehicle
HFC ....... hydrogenated fluorocarbons
(refrigerant-134a)
hp ......... horsepower
hp ......... high pressure
HRC ....... Rockwell "C" hardness
hr(s) ....... hour(s)
HSD ....... high-side driver
htr . ........ heater
HVAC ...... heating, ventilating, and air
conditioning
H/W ....... hardware
Hz ......... hertz
ICU ........ instrumentation control unit
i.d.......... inside diameter
ID .......... identification
IFI ......... Industrial Fasteners Institute
IFS ........ independent front suspension
IGN ........ ignition
ILB ........ intelligent lightbar
ILO ........ in lieu of (in the place of)
in .......... inches
in
3
......... cubic inches
Inc. ........ incorporated
inH
2
O ..... inches of water
inHg ....... inches of mercury
I/O ......... input/output
IP .......... instrument panel
ISO ........ International Organization for
Standardization
IVS ........ idle validation switch
k ........... kilo (1000)
kg ......... kilograms
km ......... kilometers
km/h ....... kilometers per hour
kPa ........ kilopascals
kW ........ kilowatts
L .......... liters
lb .......... pounds
LBCU ...... lightbar control unit
lbf·ft ....... pounds force feet
lbf·in ...... pounds force inches
LCD ....... liquid crystal display
LCOE ...... low cab over engine
LED ....... light-emitting diode
LH ......... left-hand
LH DR ..... left-hand drive
LHK ....... liters per hundred kilometers
LHS ....... low-hydrogen steel
LIN ........ Local Interconnect Network
LLC ....... limited liability company
L/min ...... liters per minute
LPG ....... liquefied petroleum gas
LSD ....... low-side driver
LVD ....... low-voltage disconnect
m .......... meters
max. ....... maximum
M-B ........ Mercedes-Benz
MESA ..... Mining Enforcement Safety
Act
mfr . ........ manufacturer
mi ......... miles
MID ........ message identifier
MIL ........ military specification
min. ....... minutes
min. ....... minimum
misc. ...... miscellaneous
mL ........ milliliters
mm ........ millimeters
mod. ...... module
mpg ....... miles per gallon
mph ....... miles per hour
MSF ....... modular switch field
MSHA ..... Mining Safety and Health
Administration
MVDA ..... Motor Vehicle Dealers
Association
n .......... negative (front axle wheel
alignment specification)
N .......... nitrogen
N/A ........ not applicable
N·cm ...... Newton-centimeters
NC ......... normally closed (terminal or
switch)
NHTSA .... National Highway Traffic
Safety Administration
NIOSH ..... National Institute for
Occupational Safety and
Health
NLGI ...... National Lubricating Grease
Institute
N·m ........ Newton-meters
NO ........ normally open (terminal or
switch)
NOAT ...... Nitrited Organic Acid
Technology
List of Abbreviations 00.01
List of Abbreviations
Heavy-Duty Trucks Service Manual, Supplement 38, July 2009 050/2

no. ........ number
NPT ....... national pipe thread
NPTF ...... national pipe thread fitting
NT ......... nylon tube or nylon tubing
NTSB ...... National Transportation
Safety Board
OAT ....... Organic Acid Technology
obs ........ obsolete
OC ........ open circuit
OCV ....... open circuit voltage
o.d. ........ outside diameter
O.D. ....... overdrive
OEM ....... original equipment
manufacturer
OSHA ..... Occupational Safety and
Health Administration
oz ......... ounces
ozf·in ...... ounces force
inches
p .......... positive (front axle wheel
alignment specification)
PACE ...... programmable electronically
controlled engine
PAG ....... polyalkylene glycol (oil)
parm ...... parameter
PC ......... personal computer
PCB ....... printed circuit board
PDC(s) .... parts distribution center(s)
PDM ....... power distribution module
PEC ....... power electronics carrier
PEEC ...... programmable electronic
engine control
PID ........ parameter identifier
PLC ....... power line carrier
PLD ....... Pumpe-Linie-Düse (pump-
line-nozzle)
p.m. ....... post meridiem (noon to
midnight)
p/n ........ part number
PRD ....... product requirements
document
PSA ....... pressure-sensitive adhesive
PSG ....... pressure sensor governor
psi ......... pounds per square inch
psia ....... pounds per square inch,
atmosphere
psig ....... pounds per square inch,
gauge
pt .......... pints
PTCM ..... pressure time control module
PTO ....... power takeoff
PTP ....... powertrain protection
pvc ........ polyvinyl chloride
PWM ...... pulse width modulation
pwr ........ power
qt .......... quarts
qty . ........ quantity
R&O ..... rust inhibitors and oxidants
R–12 ...... refrigerant-12 (CFC)
R–134a .... refrigerant-134a (HFC)
RAM ....... random access memory
RC ......... reserve capacity
recirc. ..... recirculation
Ref(s). ..... reference(s)
regen ...... regeneration
RFI ........ radio frequency interference
RH ......... right-hand
RH DR ..... right-hand drive
R/I ......... removal and installation
RMA ....... return material authorization
ROM ....... read-only memory
rpm ........ revolutions per minute
R/R ........ removal and replacement
RSG ....... road speed governor
RSM ....... regional service manager
RTV ....... room temperature vulcanizing
RV ......... recreational vehicle
SA ......... source address
SAE ....... Society of Automotive
Engineers
SB ......... service bulletin
SCA(s) .... Supplemental Coolant
Additive(s)
SCR ....... selective catalyst reduction
SCU ....... system control unit
(speedometer)
SD ......... severe-duty
SDU ....... step deployment unit
SEL ....... shutdown engine light
SEM ....... switch expansion module
SEO ....... stop engine override
SHM ....... switch hub module
SI .......... service information
SI .......... Système International
SID ........ subsystem identifier
SM ........ system malfunction
SMC ....... sheet molded compound
S/N ........ serial number
SPACE .... seat pretensioner activation
for crash survival
enhancement
SPG ....... special purpose grease
SPN ....... suspect parameter number
sq in ...... square inches
SRS ....... synchronous reference
sensor
SRT ....... standard repair time
SSD ....... side sensor display
SSID ....... smart switch identification
SST ....... stainless steel
std. ........ standard
S/W ........ software
SW ........ switch
TAM ....... thermocouple amplifier
module
TBS ....... turbo boost sensor
TCU ....... transmission control unit
TDC ....... top dead center
TDR ....... technician diagnostic routine
temp ...... temperature
TIG ........ tungsten inert gas
TIR ........ total indicator reading
TPMS ...... tire pressure monitoring
system
TPS ....... thermal protection switch
TPS ....... throttle position sensor
TRS ....... timing reference sensor
TSO ....... truck specification order
TSU ....... transmission shift unit
U.D. ....... underdrive
UNC ....... unified national coarse
UNF ....... unified national fine
U.S. ....... United States
U.S.A. ..... United States of America
USC ....... United States customary
(measures)
V .......... volts
VCU ....... vehicle control unit
VDC ....... vehicle data computer
Vdc ........ volts, direct current
VIMS ...... vehicle information
management system
VIN ........ vehicle identification number
VIP ........ vehicle instrumentation and
protection (Kysor)
VIW ........ vehicle interface wiring
(connector)
VOC ....... volatile organic compounds
List of Abbreviations 00.01
List of Abbreviations
Heavy-Duty Trucks Service Manual, Supplement 38, July 2009 050/3

VOM ....... volt-ohmmeter
VRS ....... variable resistance sensor
VSG ....... variable speed governor
VSS ....... vehicle speed sensor
VSU ....... vehicle security unit
WB ........ wire braid
WI ......... work instructions
WIF ........ water-in-fuel
WOT ....... wide open throttle
– ........... minus or negative
+ ........... plus or positive
± ........... plus-or-minus
> ........... greater than
< ........... less than
x ........... by (used in fastener size
descriptions)
" ........... inches
° ........... degrees (of an angle)
°C ......... degrees Celsius (centigrade)
°F .......... degrees Fahrenheit
# ........... number
% .......... percent
& .......... and
© .......... copyright
â„¢
.......... trademark
®
........... registered trademark
List of Abbreviations 00.01
List of Abbreviations
Heavy-Duty Trucks Service Manual, Supplement 38, July 2009 050/4

U.S. Customary to Metric Metric to U.S. Customary
When You Know
Multiply
By
To Get When You Know
Multiply
By
To Get
Length
inches (in) 25.4 millimeters (mm) 0.03937 inches (in)
inches (in) 2.54 centimeters (cm) 0.3937 inches (in)
feet (ft) 0.3048 meters (m) 3.281 feet (ft)
yards (yd) 0.9144 meters (m) 1.094 yards (yd)
miles (mi) 1.609 kilometers (km) 0.6215 miles (mi)
Area
square inches (in
2
) 645.16 square millimeters (mm
2
) 0.00155 square inches (in
2
)
square inches (in
2
) 6.452 square centimeters (cm
2
) 0.15 square inches (in
2
)
square feet (ft
2
) 0.0929 square meters (m
2
) 10.764 square feet (ft
2
)
Volume
cubic inches (in
3
) 16387.0 cubic millimeters (mm
3
) 0.000061 cubic inches (in
3
)
cubic inches (in
3
) 16.387 cubic centimeters (cm
3
) 0.06102 cubic inches (in
3
)
cubic inches (in
3
) 0.01639 liters (L) 61.024 cubic inches (in
3
)
fluid ounces (fl oz) 29.54 milliliters (mL) 0.03381 fluid ounces (fl oz)
pints (pt) 0.47318 liters (L) 2.1134 pints (pt)
quarts (qt) 0.94635 liters (L) 1.0567 quarts (qt)
gallons (gal) 3.7854 liters (L) 0.2642 gallons (gal)
cubic feet (ft
3
) 28.317 liters (L) 0.03531 cubic feet (ft
3
)
cubic feet (ft
3
) 0.02832 cubic meters (m
3
) 35.315 cubic feet (ft
3
)
Weight/Force
ounces (av) (oz) 28.35 grams (g) 0.03527 ounces (av) (oz)
pounds (av) (lb) 0.454 kilograms (kg) 2.205 pounds (av) (lb)
U.S. tons (t) 907.18 kilograms (kg) 0.001102 U.S. tons (t)
U.S. tons (t) 0.90718 metric tons (t) 1.1023 U.S. tons (t)
Torque/Work Force
inch-pounds (lbf·in) 11.298 Newton-centimeters (N·cm) 0.08851 inch-pounds (lbf·in)
foot-pounds (lbf·ft) 1.3558 Newton-meters (N·m) 0.7376 foot-pounds (lbf·ft)
Pressure/Vacuum
inches of mercury (inHg) 3.37685 kilo Pascals (kPa) 0.29613 inches of mercury (inHg)
pounds per square inch (psi) 6.895 kilo Pascals (kPa) 0.14503 pounds per square inch (psi)
When You Know Subtract
Then
Divide By
To Get When You Know
Multiply
By
Then
Add
To Get
degrees Fahrenheit (°F) 32 1.8 degrees Celsius (°C) 1.8 32 degrees Fahrenheit (°F)
Metric/U.S. Customary Conversion Chart 00.02
General Information
Heavy-Duty Trucks Service Manual, Supplement 32, January 2006 050/1

Vehicle Receipt
Prior to signing for vehicle delivery from a transporter
company, the dealer is responsible for checking for
transporter-related shortages or damages, and noting
these discrepancies on the transporter’s delivery re-
ceipt.
The dealer is also responsible for ensuring that the
vehicle was built according to the Truck Sales Order/
Invoice.
Refer to Section 3 of the Daimler Trucks North
America LLC Warranty Manual for details.
Vehicle Storage
There may be times when a vehicle is stored for long
periods before customer delivery. To protect all ve-
hicles from deterioration and weather, they must be
properly maintained. Adequate protection and stor-
age of new vehicles is the responsibility of the
dealer.
Claims arising from loss and damage to improp-
erly stored vehicles will not be reimbursed.
See Section 3 of the Daimler Trucks North America
LLC Warranty Manual for instructions on storage of
new vehicles.
Pre-Delivery Information
All pre-delivery inspections and services must be
performed at an authorized Daimler Trucks North
America LLC facility, assigned to fully qualified ser-
vice personnel and recorded on the "New Vehicle
Pre-Delivery Inspection" form.
Refer to Section 3 of the Daimler Trucks North
America LLC Warranty Manual for details.
It is recommended the pre-delivery inspection be per-
formed within 30 days of vehicle receipt.
Vehicle Receipt, Storage, and Pre-Delivery Information 00.03
General Information
Heavy-Duty Trucks Service Manual, Supplement 35, January 2008 050/1

Cooling System
1. Cooling system hoses must clear all moving
parts by a minimum of 1/4 inch (6 mm).
2. The 1-inch (25-mm) hose from the surge tank to
the engine must be free of sumps and have al-
lowance for engine torque.
3. Cooling system hoses should not be twisted or
kinked.
4. Cooling system hoses must be routed at least six
inches (152 mm) from a heat source if the heat
source does not have a heat shield. If a heat
shield is provided, the hose must be routed at
least three inches (76 mm) from the heat source.
HVAC System
1. Cushion clamps are required to support all A/C
lines. Butterfly or figure-8 clamps (two cushion
clamps) may be used to prevent rubbing or chaf-
ing.
2. Tie straps may only be used to fasten together
A/C lines that are parallel to each other.
3. Heater hoses that are protected with convoluted
tubing may be fastened with tie straps. If not pro-
tected with convoluted tubing, only cushion
clamps or butterfly clamps may be used for
heater hoses.
4. A/C lines cannot be secured to air lines, fuel
lines, or electrical wires.
5. HVAC hoses should be protected from damage
by routing them away from hazards of heat,
wheel splash (water, gravel, ice), human traffic,
and moving parts of the vehicle.
6. HVAC hoses should be routed away from sharp
points and edges (such as nuts, bolts, brackets,
and frame rail edges), moveable parts, and
sources of abrasion, cutting, pinching, or crush-
ing.
NOTE: If hoses are covered with convoluted
tubing, they may touch any of the above.
7. Hoses that are protected with convoluted tubing
may come in contact with the bends on frame
rails and filters.
8. HVAC hoses must be routed at least six inches
(152 mm) from a heat source if the heat source
does not have a heat shield. If a heat shield is
provided, the hose must be routed at least three
inches (76 mm) from the heat source.
9. HVAC hoses should be clamped every 12 to 18
inches (305 to 457 mm).
10. All HVAC hoses must be routed so that regularly
serviced components, such as fuel filters, fuel/
water separators, oil filters, air filters, belts, and
fill and drain plugs, are readily accessible for ad-
justment or replacement without the need to relo-
cate or remove the hoses.
11. All Conventional sleeper heater hoses must be
protected with convoluted tubing when they pass
through the crossmember, and at the lower
frame rail flange.
12. Hose supports for Conventional sleeper heater
hoses will be where the brackets are located.
Auxiliary Heater
No additional tie straps or tape are needed when
convoluted tubing is installed where the auxiliary
heater hose routes past the edge of the frame rail.
Engine Plumbing
1. On vehicles equipped with the Cummins M-11
engine and power steering, no additional tie
straps or tape are needed if convoluted tubing is
installed on the power steering hose where it
routes under the frame rail.
2. The engine oil pressure line should not rub or
chafe against the Teflon
®
discharge line.
Electrical Wiring
1. Wires that are bundled together should be fas-
tened at 8- to 12-inch (203- to 305-mm) intervals.
If anchor clamps are more than 12 inches (305
mm) apart, a tie strap must be used between the
anchor clamps.
2. Bundles of wires that are located in an exposed
area, such as under the cab or outside the frame
rail, need to be fastened with heavy-duty cable
ties.
Vehicle Receipt, Storage, and Pre-Delivery Information 00.03
Hoses and Electrical Wiring Routing Standards
Heavy-Duty Trucks Service Manual, Supplement 27, January 2002 100/1
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Description
Get access to the comprehensive maintenance manual for Freightliner heavy-duty trucks. This manual covers maintenance procedures for various models, including FLA COE, FLB COE, FLC 112 Conventional, FLD Conventional, and FLL COE. Whether you are a professional mechanic or a DIY enthusiast, this manual provides essential technical information to help you effectively repair and maintain these heavy-duty trucks.