Disclaimer: Persons who perform further manufacturing operations on (modify) a MACK vehicle are responsible for the vehicle’s continued and/or subsequent compliance with applicable regulations, must ensure that the vehicle as modified by them is safe to operate, and assume any liability related thereto. Mack Trucks, Inc. cannot anticipate all of the possible modifications to a MACK vehicle, know the ultimate configuration of every completed vehicle, and be aware of the intended function, operation and/or use of a completed vehicle. Regardless of assistance provided to subsequent manufacturers (others), Mack Trucks, Inc. is not responsible for modifications made to a MACK vehicle by others, nor the safe assembly and/or operation of any equipment installed on a MACK vehicle by them, nor for injury or damage caused by such modification and/or equipment.

Latest Mack Heavy Duty Manual UpdatesCheck regularly for updates to the Mack Body Builder Manual to learn of new features and updates. 0. Body Builder General InformationVehicle Certification, Body Installation, Hood/Cab Opening Angles, Vehicle Configuration Applications, Back of Cab and Fuel Tank Dimensions 1. Oil + FiltersApproved Oils, Engine Oil Type, Transmission, Lubrication, Biodiesel Fuel, Coolant Requirements 2. EngineEngine Overview, Exhaust Aftertreatment System, Heated Dump Bodies, In-Transit Heat Cooling System 3. Electrical / VECU5 / Model Year 2022 / VIN’s 10th digit = NVECU5 / Routing and Clipping Guidelines, Body Builder Connectors, Remote Start n Stop. Adding Aux Pedal, Aux Switches, LR Work Brake, Diagnostic Connectors, Multiplexing Body Builder J1939 CAN 3. Electrical / VECU4 / pre-Model Year 2022Legacy VECU4 / Routing and Clipping Guidelines, Body Builder Connectors, Remote Start n Stop. Adding Aux Pedal, Aux Switches, LR Work Brake, Diagnostic Connectors, Multiplexing Body Builder J1939 CAN 4. TransmissionmDrive Transmission, Adding Neutral Switch to T300 Series Transmission, Transmission Gear Ratios 5. BrakesAir Brake System, Air Solenoid Valves, Liftable Axle Air System, Air Brake Routing Schematics 6. Suspension & SteeringLiftable Axles, Rear Suspension, Air Suspension Height, Adjustment, Pinion Angle Specifications 7. FrameBody Mounting, Bolt Hole Patterns, Wheelbase Changes, Fasteners, Frame Welding and Cutting, LR Bumper Designs, Fifth Wheel 8. Cab / BodyInstrument Panel, Instrument Panel Layout, Guages, Switches 9. VECU5 / PTO & Pumps / Model Year 2022 / VIN’s 10th digit = NVECU5, Overview, Transmission-Mounted PTO, Rear-Mounted Engine PTO, Front-Mounted Engine PTO , PTO Programming, Parameter Programming 9. VECU4 Legacy / PTO & Pumps / pre-Model Year 2022Legacy VECU4, Overview, Transmission-Mounted PTO, Rear-Mounted Engine PTO, Front-Mounted Engine PTO , PTO Programming, Parameter Programming

Body Builder News & Events


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Mack MD Electric Trailer Brakes

Mack Medium Duty-Trailer Wiring with Brake Controller

For applications which require pulling a trailer with Electric Brakes, to prepare wiring to a brake controller, see attached instructions.

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Mack Conventional

VECU5 - New Mack Module (VECU / BBM) For 2022 Model Year

A new vehicle control unit (VECU5) has been developed to support feature growth in the coming years. All DTC's and Operations have been authored in ISO, so there is no correlation to VECU4 for 2021 model year and prior model years.

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Mack Trucks Gold Bulldog

Mack Trucks Customer Adaptation Center Opens New Facility

The Mack Trucks Customer Adaptation Center is pleased to announce the opening of our new 20,000 square foot modification facility located at Mack Trucks Lehigh Valley Operations.

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Frequently Asked Questions

What is the minimum RPM I should operate my PTO, so that my vehicle will perform Regeneration during PTO mode?
Regeneration in PTO Mode - when a vehicle is being operated in PTO mode and a diesel particulate filter (DPF) regeneration is commanded, the engine must be run at a speed above the minimum speeds listed in the tables in Body Builder Manual, Section 9, Table of Contents / Regeneration in PTO Mode. The minimum speed setting can be affected by ambient temperature and/or altitude.
On Mack mDrive, with PTO engaged while in neutral, and then selecting Drive the PTO stops turning. Why?
Remember that the mDrive is an automated manual transmission with a clutch. With the PTO engaged while in neutral, when selecting Drive, the clutch is released, then the transmission shifts into gear. When the driver takes his foot off the brake pedal and presses the throttle pedal the clutch will reengage and the PTO will start to turn again. The transmission will not shift gears and driver is limited to about 6 MPH.
Our customer chassis has an mDrive and has a need for moving PTO operation. What PTO is recommended?
Transmission mounted PTO’s are primarily used for stand-still operation, with the gearbox in neutral. However it is possible to engage PTO in vehicle speeds up to 6 MPH. If the vehicle is to have a moving PTO operation, an mDrive with a REPTO or FEPTO is recommended.
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