The Mack Anthem is a series of heavy duty trucks built by Mack Trucks. It has a long low-drag hood and fenders. It is designed as a highway semi-tractor with good fuel economy. Introduced in 2018, it remains in production in 2020.
Design
The Anthem is a long-hood conventional. Designed for highway use it can have a day cab or two different sleeper compartments. It has aerodynamic aids standards and others are available. Normally a 6x4 there are also 6x2 models. Total loaded weight can be up to and including all trailers. Advanced electronics are used for engine, chassis, and body controls, as well as maintenance. The Anthem can also be equipped with front and side collision warning systems, adaptive cruise control, lane departure warning systems, and Mack Road Stability. Mack builds their own major components and promotes an integrated design. Most vendor components are also available but engine choice is very limited.
Engines
The Anthem is available with three Mack diesels. The Mack MP7 engine is the base engine in the Anthem. It is a overhead cam turbocharged inline six-cylinder engine. It develops and of torque. The Mack MP8 engine is a overhead cam turbocharged inline six-cylinder engine. It develops and of torque. The Mack MP8HE engine is a variant of the MP8 with a mechanical drive behind the turbocharger in the exhaust stream. This allows more heat energy to be used for better fuel economy.
Transmissions
All Mack transmissions have aluminum cases and three countershafts. Multiple countershafts allows smaller countershaft gears to spread the load between them and allow easier shifting. Manual transmissions have five or six main gears, extra ratios are made with different combinations of ranges. Both Mack and Fuller have manual and automated shifting models. Allison transmissions are available as fully automatic only. Mack mDRIVE automated manual is the base transmission. It has no clutch pedal and shifts itself on demand. The driver can override it but it is normally driven in "D". It can have 12, 13, or 14-speeds. Other Mack manual transmissions have 8-18 speeds. Eaton-Fuller UltraShift automated shifting systems are available on all of their transmissions from 9- to 18-speeds. Allison RDS series 6- or 7-speed transmissions are available. The RDS is a fully automatic planetary gear transmission with a lock-up torque converter.
Frame
A ladder frame with beam axles is used. There is a single front axle on semi-elliptical leaf springs. The base rear suspension is a Mack tandem with two powered axles, a single rear drive axle with an undriven pusher axle is available. Wheelbases are from A set-back front axle is used. Set back axles, where the hood extends in front of the axle, are used when overall length is not important. They let the fenders and bumper to taper back to the tires, allowing less wind drag. Dana-Spicer and Meritor supply air brakes, steering systems, driveshafts, and other components.
Axles
Front axles are available in ratings from Mack, Dana-Spicer, and Meritor. Mack powered axles have the drive carrier on top of the housing instead of the front of it like other manufacturers. This lets the driveshafts be in line from the transmission to and between the axles. Other powered axles are available from Dana-Spicer and Meritor. These have front mounted carriers and in tandemsthe two axle housings are different. The mRIDE tandem has tapered leaves that rock above the bogey pivot then go out and above the axles. Struts go from the bottom of the bogey pivot out and under the axle. They are rated at. The Twin Yair suspension has trailing arms that fork to the rear and attach to both the top and bottom of the axle. There is an air bag behind the axle. Each axle is sprung individually. They are rated at. A Liftable pusher axle is used in a 6x2 arrangement, where only the rear axle is driven. They are lighter, have less drag, and can be raised when not needed. This allows better fuel economy and longer tire life. Other tandems with mechanical or air suspensions are available from Mack, Chalmers, and Hendrickson.
Applications
The Anthem is designed as a fuel-efficient highway semi-tractor only. Regional service is when runs are one day long. Regional tractors usually have a day cab, short wheelbase, and are often used for fleet service. They often can be used with a lower power engines and/or a 6x2 arrangement. Over-the-road is when one or two drivers live in the cab for extended periods. Over-the-road tractors are often owned by their drivers. With sleeper compartments and longer wheelbases they usually need more powerful engines than regional tractors..
