D20x22 Series II Navigator HDD Operation 50-19
DIESEL PARTICULATE FILTER (DPF) SAFETY (TIER 4 INTERIM/STAGE IIIB ENGINE ONLY)
The HEST Symbol does not signify the need for engine service; it merely alerts the operator to high exhaust
temperatures. The HEST Symbol turns on and off during normal machine operation as the engine completes
regeneration.
•Only inhibit DPF regeneration when necessary due to fire hazard.
•Limit idling time.
•Operate engine at higher load.
•Use correct engine oil. (See engine oil specifications in the Maintenance Manual.)
•Use only ultra low sulfur diesel fuel, less than 15 ppm or 0.0015% (15 mg/kg).
WARNING: When HEST (High Exhaust System Temperature) Symbol is displayed, the
exhaust gas temperature could exceed 1100°F (600°C) during regeneration. High
temperature may result in fire, burn, or explosion hazards, which may result in personal
injury or death. Do not expose flammable material or explosive atmospheres to exhaust
gas or to exhaust system components during regeneration.
WARNING: To prevent fires, routinely clear any combustible material from the engine
exhaust system. Tier 4 Interim / Stage IIIB emission compliant exhaust systems use
extreme high temperature that can ignite combustible material.
WARNING: The DPF Symbol indicates a need for a forced regeneration, due to engine or
operator conditions being outside the range for automatic regeneration. Move machine to a
safe location and perform a forced regeneration. Refer to “Forced (Manual)
Regeneration,” page 21-18. After regeneration, follow these guidelines to reduce soot
build-up in the DPF:
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