On the M2-106/M2-106V, the vertical ATS system offers a clear below-frame solution, high fuel capacity, a clear PTO solution and similar back-of-cab protrusion to the '07 DPF. A crossover 2HH also will be available for very short wheelbases (sweepers, ambulances, RVs, etc).

On the M2-106, the DEF tank is located aft of the rectangular fuel tanks. The clear back-of-cab solution includes a 6-gallon DEF tank, 50-gallon fuel tank and right-hand understep ATS.

GM

Product manager Mike Eaves said the tank on the G van and G cutaway has a capacity of 5.83 gallons and a flexible fill hose. On van applications, the tank is outside of the frame rail within the body.

The new emissions system means that with tanks full, medium-duty vehicles will carry an additional 180 pounds.

“The good news is that there are no significant changes to the frame, axles, suspension, transmission, cooling systems or fuel tanks,” he said.

Navistar

Chet Ciesielski, chief engineer of severe service products, said EGR is “an easy solution for all body builders” because there are no radical hardware additions; no Urea tanks or worries about availability of Urea; no additional catalysts, sensors, gauges or electronics; no additional fluids required; service technicians understand and know how to service EGR-based products; and truck-equipment manufacturers do not have to re-engineer bodies and functional components to accommodate new hardware and packaging.

In addition, with EGR systems, there are no additional components or weight, and no concerns with Urea distribution. All chassis configurations are maintained, and operational maintenance and serviceability issues are reduced.

Because MaxxForce Advanced EGR handles emissions reduction inside the engine, there's no additional after-treatment equipment that adds significant weight to the chassis. This means customers will not have to reduce their payloads.

On the DuraStar, there are left- and right-side mega brackets to hold a slightly larger cooling module, growing from 717 square inches to 1,045 square inches. The same exhaust options today will be available in 2010.

The WorkStar 7400/7500 features a high cab position that's about 4 inches taller, going to the same height the 7600 is now. The cooling module increases from 1,225 square inches to 1,590 square inches, with the same exhaust options as currently available.

Mack

Addressing concerns that a driver/operator could run out of DEF, Dave McKenna, director of powertrain sales and marketing, said he believed it would take a conscious effort to run the DEF tank dry. Mack has furnished a DEF level gauge in the A panel directly in front of the driver. It works similar to the fuel gauge, with the addition of a low-level indicator lamp and an audible tone for when there is less than 5% DEF remaining. Depending upon engine duty cycle, the operator will get between 220 and 280 miles per gallon of DEF.

Below 25% reserve, a small DEF gauge indicator lamp illuminates. Below 12% reserve, an audible tone sounds, alerting the driver/operator of low DEF.

Mack has successfully been running SCR systems on prototype trucks since 2000, logging more than two million miles on 10 customer vehicles. Mack's parent, the Volvo Group, has logged more than 23 million miles of road testing in Europe. This year began production of SCR-equipped vehicles to meet the Euro 4 standards, which took effect this month.

Rick Weber is the associate editor of Trailer/Body Builders, a FIRE CHIEF sister publication. This article originally appeared in their August issue.

Related Stories

• The Future of Fire Apparatus