There is much more than meets the eye when it comes to diesel particulate filters and keeping them in proper, operating condition. The technology works well to reduce emissions, but is more fragile than originally believed. This means keeping them clean so they can keep the buses clean. Hug Filtersystems says its DPF for EGR engines is essentially maintenance-free.
are benefiting and the EPA is getting good returns on their money. Over time, we’ve retrofitted a lot of buses and we’ve replaced a lot of buses and a lot of kids are breathing cleaner air because of that.”
PROTECTING THE INVESTMENT Because the filters can be costly, manufacturers alert school
districts to familiarize themselves with the proper maintenance and cleaning cycles. Navistar’s Mark Ehlers said cleaning intervals are different for the retrofits than for factory-installed filters after
2007. Prior to 2007, retrofit cleaning intervals were determined by the supplier. Te EPA sets minimum cleaning intervals for 2007 and newer factory-installed filters are dictated by the EPA. “As (school districts) consider competitors quotes for retrofits,
my advice is to not look at just retrofit cost but look at cleaning intervals of each proposal,” Ehlers said. “Tey should consider the cleaning method and cost of each proposal, and they need to con- sider whether the supplier has an exchange program. Labor is also part of the cleaning cost they should consider. Does the supplier
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