GREENSBORO, N.C. — Mack Trucks has launched its Twin Y air suspension, which uses a Y-shaped steel design for higher-strength. Offered with proprietary Mack axles, officials say the Twin Y – which is up to 400 lbs lighter than other air suspensions – is designed for highway customers desiring a smoother, more stable ride.
Mack has also announced the availability of Mack proprietary axles on its mRide spring suspension, designed “for vocational customers demanding a durable, stable ride with greater articulation,” officials said in a release.
“The Mack Twin Y and Mack mRide are designed specifically for what customers have told us they need to be successful,” said John Walsh, Mack vice-president of marketing. “Both of these suspensions benefit from our Mack proprietary axles, which provide even greater stability and fuel efficiency.”
Customer field tested for more than three million miles and available on the Mack Pinnacle Axle Back and Axle Forward models, the Twin Y features Mack S38 and S40 series axles with C125/126 and C150/151 carriers.
The design of the Mack Twin Y air suspension includes two stamped high-strength steel Y-shaped blades per wheel end. The Twin Y blades are joined to the axle with both upper and lower axle seats, which reduces suspension windup and improves tire traction and braking control.
The axle seats are clamped to the axle housing by Huck U-bolts on both sides and never need to be re-torqued, according to Mack officials.
Bushings in the upper and lower axle seats are designed to offer greater roll control and deliver easier handling and a more comfortable ride. Lighter weight and non-torque reactive, officials say the Twin Y requires less maintenance and extends tire and component life to help improve customer ROI.
Mack officials note that the Twin Y’s design means the load on the suspension is entirely on the air ride and not on the pivot bushing.
The Mack mRide spring suspension, paired with the Mack C150/151 series axle carriers, is designed for vocational applications and is available on the Mack Granite, Titan by Mack, Mack Pinnacle Axle Forward and the Mack TerraPro model trucks.
The use of spring leafs over four separate rubber block packs is designed to offer stability and articulation, while also allowing the needed clearance for larger tires and brake components required in construction and vocational applications.
In addition to being lighter than other spring suspensions, Mack officials say the mRide is designed to deliver a smoother ride, improved stability and greater ground clearance over difficult terrain. The Mack mRide provides constant ground contact for all wheels over its articulation range, which in turn maximizes traction on any jobsite, Mack said in a release.
Officials say the parallel pinion angles of the Mack axles extend the driveline joint life. Coupled with the greaseless mRide suspension, the offering boasts easier maintenance and is easier to align, contributing to reduced customer maintenance costs, according to the company.
“The completely integrated drivetrain offered by a Mack MP engine, Mack transmission, Mack axles and now the Mack mRide suspension creates superior performance, stability and handling,” said Curtis Dorwart, Mack vocational marketing product manager. “Mack vocational customers can count on mRide-equipped trucks to absorb more of the rough work on jobsites, keeping drivers more comfortable and productive.”