MUFFLER SERVICE FOR DIESEL EXHAUST SYSTEMS
Regular exhaust system checks can ensure proper fuel economy, proper noise levels, and overall truck performance. Cummins will check all components in your exhaust system, from manifold to muffler to stack, for needed maintenance and to ensure your truck is road and work-ready. Let us know if you are in need of fleet maintenance as well.
As of 2021…
- 76% of all commercial vehicles in the U.S. are diesel powered
- 97% of Class 8 big rig trucks in the U.S. are diesel powered
- 84% of transit busses in the U.S. are diesel powered
- 95% of school buses in the U.S. are diesel powered
The above statistics are according to the December 2020 U.S. Vehicles in Operation Data provided by IHS Markit. IHS Markit is a team of more than 5,000 analysts, data scientists, financial experts and industry specialists that provide business data, business information, and business insights.
Diesel truck engine exhaust systems are manufactured with specifications designed to redirect engine exhaust, reduce exhaust noise, and reduce the emissions of hydrocarbons (HC), carbon monoxide (CO), and soluble organic fraction (SOF). Diesel engines are a heavily relied upon source of power to drive the delivery of goods in our economy. With our heavy reliance on diesel power and its need to redirect exhaust, reduce exhaust noise, and reduce emissions, it is the exhaust muffler which is called upon to reduce noise. As it reduces noise, it is important that it is designed to reduce noise while also performing well in attenuation, back pressure, and structural durability.
Attenuation
In exhaust systems, attenuation refers to the reduction in sound levels measured between an engine without a muffler and the same engine with a muffler. This sound level is typically measured in decibels (dBAs). Mufflers use tubes, baffles, expansion chambers, and insulation to reduce the level of noise emitted from trucks. Mufflers that include emission reduction devices will, with the emissions reduction devices, also reduce noise, either in part or in total.
Truck engines are manufactured with the general expectation that the sound level of an engine’s exhaust will be reduced by 15-25 dBAs. The maximum, overall noise that is produced by all of the truck’s noise producing components (engine, fans, tires, etc.), typically measured while driving past a microphone at a specific speed and distance, is the actual noise level that is regulated by the United States Environmental Protection Agency (EPA).
The level of the noise is not the only consideration in attenuation. Sound quality is equally as important. A sound may be quiet enough, but if it is high pitched it can be an annoyance. Likewise, if the sound has a low rumble, the amplified throaty sound can be a serious annoyance to truck drivers as it reverberates inside the cab of the truck.
To address attenuation, heavy duty mufflers usually reduce sound with one of three noise reduction designs. First, there is the reactive silencing design whereby the muffler’s ratio of the body diameter to the tube is of a specified ratio, specific to the operating parameters of engine models with the ratio known to reduce the exhaust noise for those designated models. The second sound reduction model is resistive silencing whereby the exhaust flow is forced through a small area to remove energy. The removal of energy reduces kinetic movement of exhaust gases and the subsequent mechanical vibration of the exhaust system components, thereby reducing noise levels. The third sound reduction model is absorptive silencing which transforms wave energy into thermal energy with the use of an acoustic packing (wrap) that is placed just inside the outer shell of the muffler.
Back Pressure
A key performance factor in muffler design is back pressure. To get the optimal efficiency in diesel engine performance, it is important that a truck runs with a muffler which minimizes backpressure. Back pressure is the force that is necessary to push exhaust gas through the exhaust system. It can be thought of in terms of the resistance to exhaust flow.
The components that exhaust gases flow through, around, and out of, are important considerations in reducing backpressure. Gas and air flow momentum are important, so friction and space and volume expansions and contractions are affected by turns, or elbows, in the system as well as by tube lengths and tube diameters. Velocity head loss at the outlet is an important factor and can be optimized when back pressure is minimized with the elimination of long tube lengths, small tube diameters and sudden contractions.
A higher than specified back pressure can steal horsepower and rob fuel economy. Turbocharged diesel engines can loose about 0.5% in horsepower and fuel economy per inch Hg backpressure. When Cummins Automotive & Diesel Service repairs or replaces your exhaust system, or some of its components, they will check that your muffler is optimal in minimizing backpressure with the appropriate exhaust flow ratings at 1″, 2″ and 3″ Hg (mercury).
Structural Durability
An exhaust system can reduce noise and deliver the correct back pressure, but it also has to stand up to the test of time. The structural durability of the system boils down to the materials that are used in the components within the system as well as component and mounting support positioning in relation to the weight of the components being supported. If an upgrade to an exhaust system includes heavier components, Cummins Automotive & Diesel Service will ensure that the supporting stanchion as well as the chassis mounting brackets and hangers are properly positioned and of sufficient quality to capably support the heavier, upgraded components.
Trucking Industry Exhaust Emissions Acronyms
ATD – After Treatment Device
Bp – Backpressure (Back Pressure)
CCM – Catalytic Converter Muffler
CCV – Crankcase Ventilation
CCV – Closed Crankcase Vent
CFM – Cubic Feet per Minute
CFS – Crankcase Filtration System
CO – Carbon Monoxide
dBA – Decibel, A scale (noise level)
DMF – Diesel Multi-stage Particulate Filter
DOC – Diesel Oxidation Catalyst
DPF – Diesel Particulate Filter
EAT – Exhaust After Treatment
EDM – Emissions Device Monitor
EGR – Exhaust Gas Recirculation
EIEO – End In / End Out (muffler style)
EISO – End In / Side Out (muffler style)
FTP – Federal Test Procedure
HC – Hydrocarbon (unburned fuel)
HP – Horse Power
HTEF – High Temperature Exhaust Filter
ICC – Independent Catalytic Converter
IOM – Installation Operation Manual
LNF – Low NO2 Filter (muffler)
LXF – Low NOx Filter (muffler)
LSD – Low Sulfur Diesel (fuel)
LTF – Low Temperature Filter (muffler)
NOx – Nitrogen Oxide
OCV – Open Crankcase Ventilation
PM – Particulate Matter
SC – Silicone Carbide
SCR – Selective Catalyst Reduction
SEF – Semi-active Electric Filter (muffler)
SIEO – Side In / End Out (muffler style)
SISO – Side In / Side Out (muffler style)
SOF – Soluble Organic Fraction
SRF – Standard Recirculation Filter
ULSD – Ultra-Low Sulfur Diesel (fuel)
VOC – Volatile Organic Compound
VOF – Volatile Organic Fraction
Diesel Exhaust Aftertreatment System
Do you need maintenance, repair or replacement of the DOC, DPF or SCR in your diesel truck’s exhaust aftertreatment system?
The aftertreatment system is the method of reducing harmful exhaust emissions by cleaning exhaust gases from the exhaust of diesel truck engines with an assortment of filters, catalysts, sensors and devices to ensure the engines meet emission regulations. Harmful emission gases in the exhaust stream move from the exhaust side of the turbo through the exhaust piping and pass through the filters and catalysts in the aftertreatment system.
Emissions from a diesel engine contain harmful substances, but today’s diesel exhaust aftertreatment systems are effective in removing these harmful chemicals and particulate matter from diesel engine emissions, reducing them to oxygen and water. However, without regular and timely maintenance of the system, poor performance, poor fuel efficiency or even component failure can result.
The exhaust aftertreatment devices that are used in heavy duty pickup trucks and semi trucks include Diesel Oxidation Catalysts (DOC), Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) catalysts. The combination of these three devices utilize physical mechanisms and chemical reactions to remove nearly all particulates and harmful gases.
DOC, DPF, Regeneration, Back Pressure & SCR
The DOC is a honeycomb ceramic catalyst and it is the first device in the aftertreatment system that the flow of exhaust encounters after it leaves the engine’s manifold. The DOC is a flow through filter that contains precious metals. The gases in the exhaust, upon flowing through the DOC, start the oxidation of hydrocarbons, carbon monoxide, unburned fuel and oil, and some particulate matter (PM) is removed.
The DPF is the second device in the aftertreatment system and it is a honeycomb ceramic filter, but unlike the DOC’s flow through design, the DPF is a wall-flow filter that traps any soot that remains in the exhaust which the DOC could not oxidize. The soot will remain in the DPF until it is regenerated. With regeneration, the remaining particulates will be oxidized through two different engine temperature elevation processes.
Passive regeneration and active regeneration are the two processes that capably oxidize the particulate matter, or soot. Passive regeneration occurs when the truck’s normal operating temperatures reach between 527⁰ and 680⁰ Fahrenheit. Active regeneration is executed when sensors detect an excessive build-up of particulates within the DPF, at which point, raw fuel is injected into the exhaust stream. The excess fuel triggers engine operating temperatures in excess of 1,112⁰ Fahrenheit.
Regeneration is an important process, because without it soot builds up and the exhaust back pressure can elevate. Regeneration converts the soot to an ash and this usually reduces the backpressure down, close to normal, or at normal. The ash is composed of the minerals, metals and trace elements that result from the oxidized gases and from the breakdown of lubricants and additives. The ash is an element in the exhaust aftertreatment system that will need to be dealt with manually. It is important to periodically remove the DPF to clean the ash out. If it is not cleaned out, it will build up inside the DPF and eventually lead to problems.
Ash builds up at a much slower rate than soot; however, if the buildup is ignored it will eventually cause increased back pressure, excessive fuel consumption and potential DPF failure. The longer the ash is left inside the DPF the greater the chance it has of hardening into a plug which can block a portion of the filter. Additionally, as ash builds inside the DPF the frequency of active regenerations increases, causing poor fuel economy, extremely high temperatures, and can possibly lead to constant elevations in back pressure that can be harmful to the turbo charger.
If you notice your diesel truck is exhibiting shorter intervals between regenerations, it can be a first clue to ash build up and the need to remove the DPF for cleaning. Cummins Automotive & Diesel Service can observe the shorter intervals between regenerations by datalogging the regen cycles in the workshop with diagnostic equipment. If you bring your diesel truck in to Cummins Automotive & Diesel Service, when they remove the DPF for cleaning, they will also remove the DOC and clean it, if necessary.
The SCR catalyst is the third, and last, component in the aftertreatment system. It is a flow through device which introduces Diesel Emissions Fluid (DEF) into the process by injecting a light mist of urea into the hot exhaust stream. The diesel emissions fluid contributes to the further break down of the nitrogen oxides (NOx) that were able to get past the DOC and the DPF. The SCR catalyst usually does not need maintenance, but Cummins Automotive & Diesel Service will inspect it for those rare occasions in which the component related to the DEF fluid fails.
The DOC, the DPF, and the SCR catalyst all contain ultra-fine filter materials with which they capture the microscopic particulates. A DOC can contain several precious metals, on of which is platinum, which bonds with the oxygen molecules in hydrocarbons. The DPF can contain different materials, but most commonly it will contain cordierite composites. An SCR catalyst contains filter contents in the form of ceramic materials and precious metals. The array of filter materials contained in each device provide a specific composition of metals which play important roles in the chemical reactions necessary to effectively clean the particulates for the reduction of emissions.
DOC, DPF & SCR Maintenance
With time, the DOC, the DPF and the SCR catalyst can become clogged, therefore regular maintenance is important. Cummins Automotive & Diesel Service can quickly locate each device and service them accordingly. Routine maintenance cannot be emphasized enough, because if substantial blockage builds up, it can cause irreparable damage to the exhaust system that can result in excessively high repair costs, unscheduled truck down time, and the release of particulate matter pollution into the environment.
The DOC and DPF can be cleaned using pneumatic and thermal cleaning processes. The SCR catalyst, however, because it is a closed unit, it is not suitable for pneumatic cleaning. The SCR catalyst can get blocked by hardened diesel emissions fluid. If this occurs, it is usually not serviceable, requiring replacement of the SCR catalyst.
Driving Patterns
These filters and catalysts are sensitive devices and they work in delicate balance with each other. They are synced with the engine’s operation and respond to how the trucks are driven. If driving patterns are short and infrequent, the high temperatures necessary for regeneration may not be reached and irreversible damage to the DPF can occur. Trucks that are on the road a majority of their operation time will naturally encounter driving patterns whereby the passive regeneration kicks in regularly, resulting in the expected, longer service duration before maintenance is necessary.
Preventative Maintenance Helps To Ensure Complete Regeneration
Diesel exhaust aftertreatment systems are highly sophisticated emissions systems that need to be properly diagnosed and repaired when the regeneration process fails. Looking for the clues and indicators that regeneration has failed, or that it has processed incompletely, can save truck operators money. Early maintenance and repairs are usually less expensive than replacing the DOC or the DPF when they become compromised beyond servicing.
Cummins Automotive & Diesel Service can check the hydrocarbon doser (HD doser) for proper operation. If the HD doser fails, diesel fuel will not be injected into the exhaust stream and the engine will fail to regenerate.
Cummins Automotive & Diesel Service can check if the DPF pressure sensors are malfunctioning, which will cause the aftertreatment control module or the Engine Control Unit (ECU) to receive false readings and possibly initiate regenerations more frequently than are normal.
Cummins Automotive & Diesel Service can check for any fault codes related to the Exhaust Gas Recirculation (EGR) system. This is an important diagnostic metric to monitor because EGR fault codes can either interfere with the regeneration process or they can cancel a regeneration entirely.
If your truck is operated under conditions consisting primarily of short trips or stop and go traffic, face plugging of the DOC can occur. A plugged DOC is a DOC failure and it will interfere with the regeneration process. Cummins Automotive & Diesel Service can check the condition of your DOC. When a diesel engine is allowed to regularly reach the correct operating temperature, with longer driving/operating durations, DOC face plugging does not occur.
Cummins Automotive & Diesel Service can remove your DPF for the routine service of baking and blowing, or aqueous cleaning, to restore the filter to approximately 95% of its capacity. This routine DPF service will prevent the diesel particulate filter from plugging. A clean DPF is important because clean filters can ensure efficient, thorough regenerations rather than regenerations that last longer with poor results.
Cummins Automotive & Diesel Service can check for faulty temperature sensors. Temperature sensor readings give indications of how the DPF system is operating. Temperature sensor diagnostics are an important part of routine maintenance service because faulty sensors will stop the regeneration process.
Cummins Automotive & Diesel Service can check for early signs of Variable Geometry Turbo failures. Variable Geometry Turbo failures can prevent regenerations from being completed due to a less than optimal heat generation during the regeneration process.
Cummins Automotive & Diesel Service can run complete engine fault codes diagnostics. Engine fault codes can be thrown to indicate the failure of one or more components in the truck’s complete operating system. If one or more components in the system are faulty, they can prevent the regeneration process from occurring. As with faulty temperature sensors, engine fault codes related to emissions, pressures, turbos, boost, and more, can point out components that may need to be tested for proper operation to ensure regenerations are able to be processed.
Cummins Automotive & Diesel Service can run diagnostics on the network of electrical wires, connectors and plugs that run from components to their respective sensors. Faulty electrical wires, connectors and plugs can prevent regenerations just as faulty sensors or components can. When the electrical connecting network contains faults, the sensors may not be malfunctioning but the ECM or other related computers will receive incorrect values due to the wiring harness being defective. Incorrect values received by the ECM or other related computers can prevent full regenerations or initiate incomplete regenerations.
Trucking Industry Exhaust Emissions Terms & Definitions
Attenuation
In an exhaust system, attenuation refers to the reduction in sound level measured between an engine without a muffler and the same engine with a muffler.
Backpressure (Back Pressure)
Backpressure is the force necessary to flow exhaust gas through the exhaust system. Backpressure reduces horsepower and fuel economy in turbocharged diesel engines by an approximate 0.5% decrease in horsepower and fuel economy per inch Hg backpressure. Typically measured in inches of mercury (Hg) or inches of water (H2O) – 1.0″
Hg – 13.6″ H2O
CFM
Cubic feet per minute of airflow.
dBA
The sound level measured in decibels using a sound level meter weighted for the “A” scale frequency response. It has over 82% correlation with loudness as determined by the typical human ear (dB without the “A” scale weighting overall has only 70% correlation to loudness).
Decibel (dB)
A unit used to express the relative difference in acoustic power. Whenever dB is used, a reference level is implied. The reference value of 0.0002 dynes/cm2 = 0dB.
DPF Muffler
Diesel Particulate Filter (DPF) muffler is a muffler design which contains a particulate filter that requires Ultra Low Sulfur Diesel fuel. The filter eliminates a greater amount of particulate matter compared to a DOC Muffler, but has a higher activation temperature (260ºC). Like a DOC, it also reduces emissions while reducing exhaust noise.
Dynamometer Test
A test that allows an engine to be run to full horsepower and to be RPM rated while remaining stationary.
Exhaust Ejectors
Exhaust ejectors and check valves are key components to create a scavenged or aspirated air system. The exhaust ejector check valve, which is an internal hinge flap, prevents the damaging effects of backflow exhaust gases. An ejector check valve is added when configuring the intake system to expel filtered contaminant through the exhaust system.
A scavenged air system is typically used in off-highway equipment to preserve or extend the lifespan of the air filter. The exhaust ejector mounts as a stack at the end of an exhaust system. The stack is usually covered with a curved exhaust stack or a rain cap.
Exhaust Filter / Emissions Device
Traditional exhaust systems with mufflers are transitioning from noise reduction devices to noise and emissions reduction devices to meet federal and state emissions regulations. The primary component in the emissions device (Exhaust Filter) converts or captures exhaust emissions to reduce overall engine emissions. An emissions reduction device can be an add-on installed into the existing system or a retrofit muffler replacing the original muffler.
Exhaust Noise Level
The sound level of the exhaust system, measured in dBAs.
Inlet Hood
Mounting to either the inlet stack or the air cleaner, inlet hoods improve intake airflow and fuel economy by reducing air intake restriction. Inlet hoods also protect engine intake air from rain, snow, birds, insects, and other large contaminants. Many models will provide for the separation of water from the intake air by allowing the moisture-filled air to pass through the inlet where it is naturally forced against rear wall. The moisture sticks to the rear wall, separating from the air that passes by. From the inlet’s rear wall, the moisture drains down to, and out, through a drain hole. This makes possible the delivery of virtually moisture-free air into air the cleaner.
Intake Indicators
Various models of air intake indicators will show continuous air intake readings at the air cleaner, or show a “go/no-go” status with a green flag indicating that the air filter restriction is acceptable (not in need of service), or show an orange flag indicating that the air filter restriction is unacceptable; that it has reached its limit (service is needed).
Intake Rubber Elbows
Flexible rubber adapters and elbows with smooth radii and inside surfaces to minimize flow resistance within the air intake system, absorb vibration, and reduce intake noise levels under severe conditions.
Muffler
The primary component in an exhaust system for engine noise reduction. Mufflers are applied with the appropriate inlet diameter for the engine’s air flow requirement that is at or below the acceptable backpressure level. Most contemporary diesel engines require the use of an emissions aftertreatment device to meet emissions regulations. United States federal law prohibits the replacement of an emissions device (i.e., catalytic converter, combined catalytic converter/muffler, diesel particulate filter, etc.) with a non-emissions reducing or un-approved emissions device (such as a straight pipe or conventional muffler).
Muffler size can affect back pressure, therefore mufflers are key to truck performance because as the muffler decreases the sound, it may create more back pressure on exhaust flow. Typically, an increase in backpressure means decreased engine performance. A large muffler can be used to offset increased backpressure while maintaining overall acoustic performance.
The appropriate muffler for a truck is determined by determining the exhaust flow (CFM) and the acceptable exhaust system back pressure of your engine, in accordance with a truck owners manual or the engine manufacturer specs. With dual muffler systems, the engine’s exhaust flow (CFM) is divide by two. Mufflers are replaced according to the existing muffler style, the inlet/outlet positions, and the muffler profile (round or oval shaped). With each style it is important that a replacement muffler has an inlet diameter that is at or below the specified exhaust flow rate and at or below the acceptable backpressure level.
N/A
Naturally aspirated
Resonator
A device in the exhaust system, upstream of the muffler, that provides additional exhaust noise silencing without adding significant back pressure.
Silicone Charge Air Connectors
Air intake system connectors that are designed to isolate vibrations between hose connections and ease connections in air intake piping by compensating for slight misalignments. The silicone elastomer material resists chemicals, steam, ozone, coolants and aging conditions normally found in any engine operating environment.
Sound Level Meter
A sound level measuring device that includes a microphone, an amplifier, an output meter and sound frequency networks for measuring sound levels in decibels.
Stack-Top Moisture Eliminator
Stack-top moisture eliminators, used with cabover trucks, are mounted on top of an intake stack where it removes water from the engine’s intake air with an 80% water removal efficiency. Moist air enters the moisture eliminator cap where built-in, stationary vanes cause the air to spin, separating the air from the moisture and forcing the moisture to the outside wall, where it collects. The water then drains out through a drain hole, providing drier air to pass on, into the air cleaner. The moisture eliminator provides intake air that is acceptable for maximum filter life and engine performance.
Total Vehicle Noise
The sum of the truck exhaust noise level measurement plus fan, intake, mechanical and tire noise. Noise levels add logarithmically (equal noise levels combined add 3 dB; example 75 dB + 75 dB = 78 dB).
Vacuator Valves
The vacuator valve on air cleaners is an important part of the functionality of the air cleaner. It is an integral part of the precleaning stage on two-stage air cleaners. The dust cup, where pre-cleaned dust is collected, is normally under a slight vacuum when the engine is running. The normal engine pulsing of the vacuum causes the vacuator valve to open and close. This action automatically expels any collected dust and water. The vacuator valve also unloads when the engine is stopped.
Heavy Duty Truck Diesel Engine Muffler Selection
Selecting the proper, or optimal, diesel engine muffler for heavy duty trucks requires the consideration of several options, including muffler inlet/outlet pipe diameters, the muffler’s inlet/outlet style and configuration, and the diesel engine’s manufacturer specifications. Muffler configurations for heavy duty diesel trucks come in 6 inlet/outlet style options, or 7 if you take the dual exhaust option into account. The exhaust system’s map of pipe layout and routing will usually dictate the style selection because one style usually works best in mating the inlet to the upstream piping and the outlet to the downstream piping in confined spaces.
Mufflers are installed in accordance with the exhaust system configuration (discussed above) and with the engine manufacturer engine’s attenuation expectations, their back pressure specifications, and their horesepower ratings. Cummins Automotive & Diesel Service will replace and install new muffler configurations with the style and size that best accommodates the exhaust routing layout and in accordance with the exhaust specifications of the manufacturer engine model in the truck being serviced.
Six Muffler Styles For Heavy Duty Trucks
- End Inlet/End Outlet/On Center
- End Inlet/End Outlet/Offset or Dual End Inlet /End Outlet
- Side Inlet/End Outlet
- End Inlet/Side Outlet
- Inlet & Outlet on Same End
- Side Inlet /Side Outlet
Caterpillar Diesel Engine Models For Muffler Application
3116
3176
3306
3126B
3306B
3406B
3406E
C-10
C-12
C-15
C-16
Cummins Diesel Engine Models For Muffler Application
6BT
6CT
ISB
ISC
ISM
ISX
L10
M11
N14
NTC
Signature
Detroit Diesel Engine Models For Muffler Application
6-71T
6V-92T
6V-92TA
6V-92TT
6V-92TTA
8.2T
8V-71T
8V-71TA
8V-71TT
8V-71TTA
8V-92T
8V-92TA
8V-92TT
8V-92TTA
Series 40E (7.6 LTA)
Series 40E (8.7 LTA)
Series 50 (8.7 Ltr)
Series 60 (11.1 Ltr)
Series 60 (12.7 Ltr)
Series 60 (14 Ltr)
Dodge RAM Diesel Engine Models For Muffler Application
B-series 5.9 Liter
B-series 6.7 Liter
Ford Powerstroke Diesel Engine Models For Muffler Application
7.3L
6.0L
6.4L
6.7L
GM Diesel Engine Models For Muffler Application
6.6L Duramax LB7
6.6L Duramax LLY
6.6L Duramax LBZ
6.6L Duramax LMM
6.6L Duramax LGH
6.6L Duramax LML
6.6L Duramax L5P
International Diesel Engine Models For Muffler Application
6.9L
7.3L (T444)
9.0L
DT360
DT414
DT420
DT466E
DT812B
DT817
DT817C
Mack Diesel Engine Models For Muffler Application
E6
E7
E9
ENDT673
ENDT675
ENDT865
ENDT866
Mercedes-Benz Diesel Engine Models For Muffler Application
OM 300
OM 400
OM 500
OM 900
MBE 900
MBE 4000
Navistar International Diesel Engine Models For Muffler Application
VT275
VT365
VT390
6.9 L
T444
T444E
DT466A
DT466B
DT466C
DT466E
DT530E
DT530
DTS530E
HT570
MaxxForce 5
MaxxForce 7
MaxxForce 9
MaxxForce 10
MaxxForce 11
MaxxForce 13
Maxxforce DT
Volvo Diesel Engine Models For Muffler Application
D11
D12
D13
D13TC
Exhaust System Related Parts Manufacturers’ Code & Name List
AA – AMERICAN AUGERS
ABG – ABG
ABPS – AIRBORNE PRODUCT
AC – AC
ACFT – ACRAFIT
ACMS – ALLIS CHALMERS
ADUM – ADVANCE MIXER
AECW – A E C WHITLOCK
AFC – AL FILTER CO
AGCA – ACTIVE GEAR
AGCO – AGCO
AGEM – AG CHEM EQUIPMENT
AJMC – AUTO JET
ALMD – ALLMAND BROS
ALMN – AHLMANN
ALP – ALLIANCE PARTS
ALSN – ALLISON
ALSY – ALLIED SYSTEM
AMBC – AMBAC
AMC – AMC
AMEC – AM GENERAL
AMERIC – AMERICAN CRANE CORP
AMFGI – AURORA MFG INC
AMHO – AMERICAN HOIST & DERRICK
AMLF – AMERICAN LAFRANCE
AMTK – AMTRAK
AP – A P PARTS
APE – APE INDUSTRI AB
ARDCO – ARDCO
ARRO – ARROW-MASTER
ARV – ARVIN
AST – ASTEC UNDERGROUND
ASTEC – ASTEC
ASV – ASV INC
ATCO – ATLAS COPCO
ATHEY – ATHEY/FIVE STAR PRODUCTS
ATHM – ALSTHOM
ATHP – ATHEY
AUST – AUSTOFT
AUTM – AUTO MARINE
AUXI – AUXIFLOW
BABR – BARBER GREENE
BADG – BADGER
BAESYS – BAE SYSTEMS
BAKO – BARKO HYDRAULICS
BAR – BAUER
BATI – BENATI
BDER – BOMBARDIER
BEQP – BELL EQUIPMENT
BLDY – BLUE BIRD BODY
BLNT – BLOUNT
BMY – BMY WHEELED VEHICLES
BNTA – BANTA ASSOCIATES
BOMA – BOMAG
BORG – BORG-WARNER CHEMICALS
BOSS – BOSS INDUSTRIES
BRED – BREDA COSTRUZIONI
BRLEE – B R LEE INDUSTRIES
BROD – BRODERSON
BROW – BROWN DESIGN
BRWY – BROCKWAY
BVER – BUHLER VERSATILE SERVICE
CABT – CABOT CORP
CALD – CARRIER TRANSICOLD
CAM – CAMOPLAST INDUSTRIAL
CAME – COMPACTION AMERICA
CANF – CANADIAN FILTER
CASE – CASE
CAT – CATERPILLAR
CBM – CBM
CC – COUNTRY COACH
CCML – CORNELL CRANES
CDIV – CONTINENTAL DIVERSIFIED
CEDAR – CEDARRAPIDS INC
CETCO – CETCO INC
CHAMP – CHAMPION INDUSTRIES
CHAP – CHAMP
CHARD – CHARDONNET
CHLN – CHICAGO PNEUMATIC
CHLR – CHRYSLER
CLAC CADILLAC & LAKE CITY ROADWAY
CLJL – CLARK,J.L.
CLMP – CLAMPS INC.
CLRK – CLARK
CMCO – CAMECO
CMI – CMI
CMPR – COMPAIR
CMWK – CHARLES MACHINE
CNLC – CURTIS NOLL
COLT – COLT
COMP – COMPAC EQUIPMENT
COMPAC – COMPACT TECHNOLOGIES
CONK – CONEK
COUG – COUGLAR INDUSTRIES
CRAN – CRANE CARRIER
CRMY – CHAMPION ROAD
CRPD – CEDARAPIDS
CRQT – CARQUEST
CSND – CROSLAND
CTRY – CENTURY II
CUCC – CUB CADET
CUMS – CUMMINS
CYPR – CYPRESS
DACR – DAVEY COMPRESSOR
DAEW – DAEWOO
DART – DART
DCOA – DYNAMICS CORP OF AMERICA
DCVG – DANA CORP
DD – DETROIT DIESEL
DENY – DENYO
DETZ – DEUTZ
DFLX – DYNAFLEX
DIA – DIAMANT BOART INC
DINA – DINA SA
DIND – DIAMOND
DLEQ – DIGITAL EQUIPMENT
DLTC – DRILTECH
DMAG – DEMAG
DMI – DMI
DMON – DOMINION
DMT – DMT CORP
DRBG – DRONNINGBORG
DRDT – DROTT
DREO – DIAMOND REO
DRSS – DRESSER
DSL – DIESEL DIVISION
DUHR – DURHAM
DWCH – DITCH WITCH
DYPC – DYNAPAC
EAC – ENGINE AND ACCESSORY INC
EAGL – EAGLE TRUCK PRODUCTS
EAGP – EAGLE PICHER
EARN – EARNEST MACHINE
EATN – EATON
ECLD – EUCLID
ECS – ENGINE CONTROL SYSTEMS
EGLE – EAGLE CRUSHER
EIMC – EIMCO
EINT – EAGLE INTERNATIONAL
ELECT – ELECTROLUX
ELGN – ELGIN
EMSN – EMERSON ELECTRIC
ENGL – ENGELHARD CORP
ENGLE – ENGLEHARD CORP
ENGN – ENGINES INC
ENMT – ENMTP CPG
ENTW – ENTWISTLE COMPANY
ERIC – ERICKSON
ESSEX – ESSEX ELECTRO ENGES
FAS – FASTENAL
FAST – FASTENWARE
FAUN – FAUN
FDEN – FODEN
FDQN – FIELD QUEEN
FEDM – FEDERAL MOTORS
FEDR – FEDERAL-MOGUL
FENT – FENDT
FIAT – FIAT
FILTER – FILTER SUPPLY CO
FIVE – FIVE STAR MFG LLC
FLPW – FLUID POWER
FLTR – FILTER INC
FLYR – FLYER INDUSTRIES
FMC – FMC
FMCO – FORD
FMHD – FARMHAND
FMNT – FERMONT DIV
FNEQ – FINN FILTER
FOREM – FOREMOST INDUSTRIES
FPCO – FAPCO INC
FRAM – FRAM
FREQ – FRANKLIN
FRHF – FATE ROOT HEATH FASTEN
FRTL – FREIGHTLINER
FRYM – FAIRMONT RAILWAY MOTORS
FSA – FSA
FTGD – FLEETGUARD
FURU – FURUKAWA
FWD – FWD
FXBL – FLXIBLE
GALN – GALION
GAME – GAME EQUIPMENT
GASP – GLOBAL ASPHALT PRODUCTS
GBKE – GALE BANKS ENGINEERING
GDLS – GDLS – CANADA CORP
GE – GENERAL ELECTRIC
GEDY – GENERAL DYNAMICS
GEFCO – GEFCO
GEHL – GEHL
GEPA – GENERAL PROPULSIONS
GILB – GILLIG
GM – GM
GMCT – GENERAL MOTORS TRUCK
GNRC – GENERAC
GOE – GORELICHS INC
GRDL – GRADALL
GRDR – GARDNER DENVER
GRMC – GRAND ROCK
GROCK – GRAND ROCK MFG CO
GRST – GRIMMER SCHMIDT
GRVE – GROVE
GTMN – GETMAN
HARL – HARLAN PARTS
HARLEY – HARLEY POWER SYSTEMS
HAVA – HAVAM
HAWK – HAWKER SIDDELEY
HAY – HAY & FORAGE
HDMA – HYDREMA
HDMC – HYDRA MAC
HDMI – HEAVY DUTY MFG
HERC – HERCULES
HGMP – HICKLIN GM POWER
HME – HME INC
HNDA – HONDA
HNMG – HANOMAG
HOBT – HOBART
HOIST – HOIST LIFTTRUCK MFG
HRBR – HARBORMASTER MARINE
HRCN – HURRICANE COMPRESSOR
HRSN – HENDRICKSON
HSTR – HYSTER
HTHI – HITACHI
HYUN – HYUNDAI
IAMG – IOWA
ICAB – INDUSTRIAL CAB
ICCMFG – I C C MFG
IKRS – IKARUS
IMP – IMPERIAL GROUP
INDIP – INDIANA PHOENIX INC
INSY – INSLEY
IR – INGERSOLL RAND
IRCR – IRCR MFG
IRKA – IRKARUS
IRT – IRI INTERNATIONAL
ISERVI – INDUSTRIAL SERVICE CORP
ISZU – ISUZU
IVECO – IVECO
JAGR – JAEGER
JCB – JCB
JHEI – JOHN HEINRICH
JJI – JACKSON JORDAN
JLGI – JLG
JNDR – JOHN DEERE
JOY – JOY
JURA – JURA FILTRATION
KAEL – KAELBLE
KARP – KAR PRODUCTS
KBCO – KOBELCO
KBTA – KUBOTA
KENPAR – KENPAR
KIMBLE – KIMBLE CHASSIS
KLMA – KALMAR
KLTC – KELTEC
KMBL – KIMBALL TOPPERS
KOEH – KOEHRING
KOHL – KOHLER
KOOT – KOOTENAY
KRAM – KRAMER
KRES – KRESS
KRON – KRONE
KSHA – KERSHAW
KTSU – KOMATSU
KUTK – KUT KWIK
KW – KENWORTH
L3COM – L3 COMMUNICATIONS
LAWSON – LAWSON PRODUCTS INC.
LBX – LBX COMPANY LLC
LCD – LAKE CHARLES DIESEL
LEAR – LEAR SIEGLER
LEBR – LIEBHERR
LEC – LINCOLN ELECTRIC
LETO – LETOURNEAU
LEVN – LEVINSON BROS
LEYL – LEYLAND DAF
LGMF – LOGAN
LINK – LINK MFG LTD
LINMR – LINMARR ASSOC INC
LKBT – LINK BELT
LKWD – LOCKWOOD
LNDE – LINDE
LNDL – LANDOLL CORP
LOES – LOESING
LONG – LONG
LORAL – LOR AL PRODUCTS INC
LORR – LORRAINE
LRAN – LORAIN
LROI – LEROI
LULL – LULL
MACD – MAC DON INDUSTRIES
MACK – MACK
MAN – MAN
MARA – MARATHON EQPT LTD
MARE – MAREMONT CORP
MARINE – MARINE TRAVELIFT, INC.
MARTIN – MARTIN MACHINERY
MARWIL – MARWIL PRODUCTS
MBSI – MITSUBISHI
MCC – McCORMICK
MCHC – MECHANICS CHOICE
MCII – MCII
MDIESL – MARTIN DIESEL INC
ME – MILLER ELECTRIC
MEDINA – MEDINA REPLACEMENT PARTS
MERS – MERCEDES
MF – MASSEY FERGUSON
MH – MANN & HUMMEL
MIIN – MINNPAR
MILR – MILLER SPREADER
MJPR – MI-JACK
MLS – MARVIN LAND SYSTEMS
MNLS – MCNEILUS
MNTO – MANITOU
MNTW – MANITOWOC
MOB – MOBILE PRODUCTS INC
MOCH – MOTOR COACH
MOGU – MOGUERT
MONAC – MONACO COACH CORP
MOXY – MOXY
MPOW – MOTOR POWER INDUSTRIES
MRBR – MORBARK
MRMN – MARMON MOTOR
MRMT – MAREMONT
MRTZ – MERTZ
MTRC – MOTOR COACH INDUSTRIES
MTWC – MANITOWOC CRANE GROUP
MULTI – MULTI PART
MUNCIE – MUNCIE RECLAMATION
MZDA – MAZDA
NACO – NACCO MATERIALS
NAPA – NAPA
NAT – NATIONAL OILWELL
NAVI – NAVISTAR
NEPN – NEOPLAN
NEWFLY – NEW FLYER INDUSTRIES LTD
NEWS – NEWSTREAM ENTERPRISES
NFC – NFC INDUSTRIES
NH – NEW HOLLAND
NLSN – NELSON
NOBEL – NOBLE CONSTRUCTION EQUIPMENT
NPLN – NEOPLAN U S A
NPRT – NEOPART
NWEG – NORTHWEST ENGINEERING
OK – O & K
OKSH – OSHKOSH
OMML – OMARK MATERIAL HANDLING
OMNI – OMNIQUIP PARTS WORLD WIDE
ONAN – ONAN
OTWA – OTTAWA TRUCK
OXBO – OXBO
OXBOI – OSBO INTERNATIONAL
PACC – PACCAR PARTS DIV
PAI – PAI INDUSTRIES INC
PALA – PALATEK INC
PBLT – PETERBILT
PBRN – PEABODY BARNES
PCFE – PACIFIC ENGINEERING
PDCI – PARTS DISTRIBUTING
PDEL – PRINCETON DELIVERY SYSTEMS
PERK – PERKINS GREAT LAKES
PETB – PETBOW
PETTI – PETTIBONE-MULLIKEN
PH – P & H
PHCO – PRECISION HUSKY
PHOE – PHOENIX INDUSTRIES
PIE – PIERCE
PITC – PART INTL TRADE CO
PKNS – PERKINS
PLOC – PLYMOUTH LOCOMOTIVE WORKS
PNJK – PANDROL JACKSON
POWER – POWER EQUIPMENT & ENGINE
PPOW – PIVOT POWER INC
PRIN – PRINOTH
PRLP – PEERLESS PUMP
PRTCTR – PARTS SUPER CENTER
PRVT – PREVOST CAR
PSIS – PSI SPECIALIZED VEHICLES
PTBM – PORTABLE MILLS
PTBN – PETTIBONE
PTN – PPM
PUPR – PUROLATOR
PWRT – POWERTHERM
QUIN – QUINCY
RCHD – REICHDRILL
RDRL – REEDRILL
RDTC – ROADTECH
REX – REX
RIKL – RICKEL
RIMP – RIMPULL
RKRM – RIKER
RNCO – REINCO
RNDR – RENDERS
ROSEN – ROSENBAUER AMERICA
ROSS – ROSS CORP
ROUS – ROUSSELLE
ROVR – ROVER
RSCO – ROSCO
RSNBCS – RUSTON BUCYRUS
RSNBR – ROSENBAUER America
RTWC – RAILWAY TRACK WORK
RVI – RENAULT VI
RWMF – RAINBOW MFG
RXRD – REXNORD
RYCO – RYCO
RYGO – RAYGO
RYKE – RYKEN TUBE
SABI – SABIEX INTERNATIONAL
SAKR – SAKURA
SAME – SAME
SCHAE – SCHAEFF LIFT TRUCK INC
SCNA – SCANIA
SCOMP – SUPERIOR COMPRESSOR
SCOMPA – SUPERPAK COMPACTION
SCRD – SICARD
SCRM – SCHRAMM
SDMO – SDMO
SDVK – SANDVIK
SEDD – SEDDON-ATKINSON
SHBR – SCOTT HUBER
SHUT – SHUTTLELIFT INC
SIGM – SIGMA AIR CONDITIONING
SISU – SISU
SKYJ – SKYJACK
SLAR – SULLAIR
SLIC – SELLICK EQPT LTD
SLVN – SULLIVAN
SMCI – SAFARI MOTOR COACHES INC
SNBL – SNOWBLAST-SICARD
SNKL – SNORKEL
SOFI – SOFIMA
SPCH – SPARTAN CHASSIS
SPRT – SPARTAN MOTORS
SRC – SRC
SRSD – SAUER SUNDSTRAND
STEW – STEWART & STEVENSON
STGR – STEIGER
STIL – STILL
STMC – STEMCO
SUSN – SUSAN
SWEE – SWEEPSTER JENKINS
SYNER – SYNERGY INTERNATIONAL
TAC – TRANSPORTATION ACCESSORIES
TBCR – TUBE CRAFT
TCLD – TRANSICOLD
TDSC – TRACKMOBILE
TDYN – TELEDYNE
TENT – TENNANT
TERN – TERNESS PROCUREMENT SERVICES
TESSI – TESSI TRUCK EXHAUST INC
THOM – THOMAS DENNIS CO INC
TIM – TIM
TIPP – TIPPECANOE
TJAK – TIMBERJACK
TJMG – T & J MFG
TKNG – THERMO KING
TMCO – TYMCO
TMLS – TEXTRON MARINE AND LAND SYSTEM
TMPO – TAMPO
TMRK – TAMROCK
TMTR – TOWMOTOR
TORCA – TORCA PRODUCTS
TPORT – TUNED PORT INDUCTION SPEC
TRAK – TRAK INTERNATIONAL
TREX – TEREX
TRJN – TROJAN
TRMF – TRANSPORTATION MFG
TRUX – TRUCKEX
TYLE – TYLER POWER PRODUCTS
TYLR – TAYLOR
TYMC – TAYMECH
U C – UNITED CENTRAL INDUSTRIAL SUPP
UAC – UNITED AIR CLEANER
UCP – UNIVERSAL COACH PARTS
UNCT – UNION CITY BODY
UNIP – UNIPART
UNVL – UNIVERSAL
UPFR – UP FRONT TECHNOLOGIES
UPRH – UP-RIGHT HARVESTER
UPTI – UPTME PARTS LLC
URIG – UNIT RIG EQUIPMENT
VACT – VACTOR MFG
VALM – VALMET
VANAIR – VANAIR MFG
VCOR – VERSATUBE
VENCH – VENCHURES PACKAGING INC
VH – VAN HOOL
VIC – VIC
VLVO – VOLVO
VME – VME
VMER – VERMEER
VOEG – VOEGELE
VSTL – VERSATILE
WALMO – WALGAHNMOTORENTECHN
WBCO – WABCO
WGMC – WHITEGMC
WGNR – WAGNER MINING EQPT
WHCO – WHITING
WHITE – WHITE
WHMS – WESTINGHOUSE MFG SERVICES
WILM – WILMAR
WIMC – WIMCO LTD
WIRG – WIRTGEN
WIX – WIX
WKSA – WAUKESHA
WLDN – WALDON
WLKR – WALKER MFG
WPOW – WINPOWER
WRNR – WARNER & SWASEY
WRTH – WORTHINGTON
WSTI – WESTERN STAR TRUCK
WTLK – WHITLOCK
XAIR – EX AIR
XMN – EXMAN
YALE – YALE
YOUNM – YOUNG MACHINE COMPANY
YPEI – YORK PUMP & EQPT