Ford F-650 Owner's Manual page 221

The engine speed may increase slightly. To allow parked regeneration to
continue uninterrupted:
1. The vehicle must remain parked
2. The transmission must remain in P (Park) or N (Neutral) (as
previously described in Step 2).
3. The accelerator pedal, service brake pedal, and clutch pedal (if
equipped) must not be pressed
4. The parking brake must remain set
On average (depending on filter level and other factors), the process takes
20–30 minutes to complete. The DPF lamp turns off when the process is
complete. Repeat Steps 1–5, if parked regeneration is interrupted.
To discontinue parked regeneration
Press any of the floor pedals to discontinue parked regeneration.
Diesel particulate filter maintenance and service
The DPF is designed to retain a relatively large amount of residual ash
and provide many miles and hours of maintenance-free operation. At
some point, generally beyond 150,000 miles (240,000 km) or 5,000 hours
of operation (whichever comes first), the DPF requires professional
cleaning to remove the accumulated ash.
The exact number of miles or hours of operation varies greatly depending
upon vehicle/engine loading and operating conditions, ash content of the
engine oil, and quality of the diesel fuel used in your truck. Adhering to
your engine manufacturer's recommended oil and fuel specifications
maximizes the miles and hours of operation before a DPF professional
cleaning is required. Refer to your engine manufacturer's owner's manual for
more details regarding recommended maintenance and service of your DPF.
Exhaust outlet assembly
WARNING: The normal operating temperature of the exhaust
system is very high. Never work around or attempt to repair any
part of the exhaust system until it has cooled. Failure to follow these
instructions may result in serious personal injury.
The exhaust outlet assembly on your vehicle is a uniquely functioning
device that accompanies the DPF assembly. It is designed to help control
the temperature of the exhaust during the DPF regeneration process. Do
not modify or remove this device. Modification of the system
2012 F-650/750 (f67)
Supplement, 2nd Printing
USA (fus)
Maintenance and Specifications
221