OPERATION
5-26 / Engine Exhaust After Treatment Systems
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5-12.5 Regeneration Inhibit
The Regeneration Inhibit Switch can be used to temporarily suspend an in-process active regeneration. This may
be done when the regeneration is going to occur in a location or situation that is not ideal and must be postponed.
An indicator will appear on the dash panel when this mode is activated.
• The regen inhibit switch should not be used for normal operation. It should only be used for hazardous
environments.
• Overuse of the regeneration inhibit feature will lead to more frequent need of parked/stationary regeneration,
or the need for servicing and/or replacing the Diesel Particulate Filter (DPF).
5-12.5a Regeneration Inhibit While Pumping
A common misconception is that regeneration will negatively affect pumping operations. Any time the engine detects
a need for regeneration, it is looking for conditions (such as engine speed and temperature) to start an active
regeneration. If the pump is engaged, the regeneration process should not affect the engine speed.
5-12.6 Maintenance
Regeneration removes soot from the DPF, but accumulated ash remains in the filter. Over time the DPF must be
removed, disassembled, and cleaned in a special machine to remove the ash build-up.
• CEL will illuminate and a fault code will be set when ash removal is necessary.
• The Ford maintenance interval is 120,000 miles or 190,000 km (cleaning), or 250,000 miles or 400,000 km
(replacing), which is dependent on duty cycle, type of oil used, and oil consumption rate.
• The Cummins maintenance interval is 200,000-400,000 miles, or up to 6,750 hours, which is dependent on duty
cycle, type of oil used, and oil consumption rate.
• Using CES20081/API CJ-4 oil will maximize the DPF maintenance interval.
Inhibiting or suspending regeneration too frequently can result in exhaust restriction, higher fuel
consumption, and engine performance loss due to soot build-up in the DPF.
If the DPF has reached system limits (DPF light flashes with Check Engine Light) the operator needs to
take action such as removing the truck from a high-load mission, and initiating an active regeneration
or a parked regeneration.
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