A prototype of the new Mack TerraPro Series arrived at Schwing America recently. Since this model will also usher in the 2007 EPA certified engines there is considerable interest in the replacement for the venerable MR Macks that have been the standard for concrete pump applications.

The 2007 Environmental Protection Agency (EPA) regulations regarding the use of S15 Ultra Low Sulfur Diesel (ULSD) are now in effect. S15 ULSD is defined by the EPA as diesel fuel with a sulfur content not to exceed 15 parts per million (PPM), a sharp contrast to prior fuels with a sulfur content of 500 PPM. The new fuel was actually introduced on October 15, 2006, with the aim being to significantly reduce the amount of Oxides of Nitrogen (NOx) and particulate matter emissions.

The new Mack TerraPros must run only on S15 ULSD fuel. The engines also require the use of new oil, one completely reformulated to help protect engine components. It is recommended that fleets engage in sulfur testing as their transition progresses to assure the sulfur content is being reduced effectively.

It is estimated that the energy content of ULSD fuel will be reduced by 1% from that of 500 PPM fuel, which may affect fuel mileage. The most-discussed features of the new 2007 engines are the DPFs which weigh about 110 pounds and contain a Cordierite (ceramic) honeycomb filter. The DPF will provide a variable volume of filtration and insulation while reducing hydrocarbons.

The soot collected within the channels of the DPF must be regenerated, or “burned off ” periodically. This will be done automatically in most cases on the TerraPro. The operator will be responsible for overriding the system manually if regeneration should be delayed. This could occur when the truck is positioned near overhanging structures or trees. Exhaust gas temperature can reach 1100 degrees Fahrenheit during regeneration which takes about 25 minutes.

One result of regenerating the DPF on a regular basis is an accumulation of residual ash within the filter. Consequently, the EPA suggests the DPF system filter be cleaned at least once every 150,000 miles.

As the first of the TerraPros are put into service, the impact on fuel economy, regeneration of the DPFs and cost of operation will become known. Meanwhile, some pump manufacturers stocked up on 07 pre-emissions MR Macks to satisfy customers who want to forestall the higher costs and other unknowns that will be sure to surface with the ULSD burning 2008 models.

The TerraPro also offers the latest generation of Vehicle Management and Controls System (VMAC) allowing customers to closely monitor truck and engine performance. ACPA members who visited Schwing America at last year’s orientation to the new Mack trucks were able to learn about the VMAC features and benefits first hand. The fuel consumption information generated by VMAC was used in calculating fuel use in order to challenge the IRS Fuel Tax Issue. Other options available with the system include road speed tamper detection, integrated starter protection and programmable daytime running light override. Advanced software captures information like vehicle trip histories, duty cycle information and scheduled maintenance intervals.

Schwing S 41 SX models and smaller pumps mounted on the TerraPro will come standard with the EPA 07 certified 11-liter Mack MP7 producing approximately 365 hp. The MP7 Engines will utilize the Arvin Meritor ignition system of Diesel Particulate Filtering (DPF). Schwing S 42 SX models and larger will utilize the 07 certified MP8 engine set at approximately 405 horsepower. This engine will use the Fleetguard DPF which relies on the heat of combustion to burn diesel particulate. Both engines feature single overhead cams, electronically controlled fuel injection and one piece steel pistons.