Ford F-650 2008 User Manual page 181

Conditions
• Carrying unnecessary weight may reduce fuel economy.
• Fuel economy may decrease with lower temperatures during the first
8–10 miles (12–16 km) of driving.
• Flat terrain driving improves fuel economy over hilly roads.
• Transmissions give their best fuel economy when operated in the top
cruise gear and with steady pressure on the accelerator.
• Close windows for highway driving.
DIESEL PARTICULATE FILTER (DPF)
Your vehicle is equipped with a diesel particulate filter (DPF), as part of
the after-treatment exhaust system, to trap soot and other large particles
produced by the engine combustion process. The soot that accumulates
in the filter must be periodically reduced to ash to prevent excessive
exhaust restriction. The soot reduction process, also known as "filter
regeneration," is generally performed automatically by your engine and
after-treatment system.
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. Use special care when working
around the diesel particulate filter. The DPF heats up to a high
temperature after only a short period of engine operation, and can
remain hot even after the engine is turned off. Failure to follow these
instructions may result in personal injury.
Diesel particulate filter regeneration (Caterpillar engine only)
DPF regeneration requires no operator interaction and may occur at any
time. A small increase in engine sound-level during filter regeneration is
normal and should be no reason for concern.
A separate fuel injector/nozzle, which requires periodic cleaning, is used
in the regeneration process. Refer to Caterpillar's Operation and
Maintenance Manual for details regarding cleaning requirements.
2008 F-650/750 (f67)
Supplement
Maintenance and Specifications
181