Mack Trucks Inc has introduced the new Maxitorque ES T300 family of transmissions, which feature a triple countershaft design, high-torque capacities, one-piece aluminum case/clutch housings, and revised ratios.
Two 10-speed transmissions have been added to the Maxitorque ES line. The T310M and T310MLR offer low gear ratios in both forward and reverse, and both offer Mack's shiftable multi-speed reverse. PTO mount options include six- and eight-bolt on the main and compound cases and a rear option.
On Maxitorque ES transmissions the “M” designation stands for multi-speed reverse, the “L” for low forward ratio, and the “R” for low reverse ratio.
The T310M has an overall ratio of 23.77 and a low ratio of 17.35. A top gear ratio of .73 allows operators to cruise at highway speeds when over-the-road driving is required.
For applications requiring slow-speed operation, Mack provides the T310MLR. Its overall ratio is 38.46 with a low ratio of 27.31, and the top gear ratio is .71.
The Maxitorque ES series expands Mack's nine-speed line of transmissions from one to three models. The T309 has similar ratios and a lower first gear ratio (11.4) than its predecessor, the T2090. The T309L has a first gear ratio of 13.93. The T309LR has the same forward ratios as the T309L, but includes a slow reverse. The top gear ratio in all nine-speed transmission is .71.
For heavy-hauling and peak performance, new lower ratios on the Maxitorque ES 13- and 18-speed transmissions improve low speed maneuverability. The top gear overdrive ratio is .71.
T313L and T318L transmissions have a 15.91 ratio in reverse, and the T313LR and T318LR have a 28.98 reverse ratio. All four models feature a 23.13 overall ratio and a 16.42 low forward ratio, as well as main case, rear case, and rear PTO mounts.
To match high-horsepower Cummins engines, 2,100-ft-lb versions of the 13- and 18-speed transmissions also are available.
In all Maxitorque ES transmissions, Mack has designed new fine pitch sliding clutches and reduced internal static forces that must be overcome to shift. Shift lever revisions also produce a tighter, more comfortable shift pattern.
All Maxitorque ES (which stands for Easy Shift) T300 transmissions are lighter than their T200 predecessors. Gear forgings were designed to maintain strength while eliminating unnecessary material. Additional enhancements include a range shift synchronizer, a range shift air valve, large-diameter air line fittings, and an internal oil pump located in the clutch housing to enable easier use of the left-side PTO.
Twenty new Maxitorque ES transmissions are available, covering five-, six-, seven-, eight-, nine-, and 10-speed models with torque capacities of 1700 and 1800 ft-lb, as well as 13- and 18-speed models with torque capacities of 1800 and 2100 ft-lb. For more details, contact Mack, 2100 Mack Blvd, PO Box M, Allentown PA 18105-5000.