Applicable Systems
PC200 Excavator
Symptoms
DPF regeneration failed to complete; soot loading continues to increase; engine may derate if not addressed.
Possible Causes
- Exhaust gas temperature too low for regen
- DPF substrate cracked or melted
- DEF dosing system malfunction
Troubleshooting Steps
- Step 1: Check DPF soot loading percentage
Soot loading > 100% - Step 2: Verify exhaust gas temperature during regen attempt
EGT reaches 600C for regen - Step 3: Inspect DEF dosing valve operation
Valve sprays during regen - Step 4: Check for exhaust leaks before DPF
No leaks found - Step 5: Perform forced stationary regen or replace DPF
Soot loading < 30% after regen
How to Reset
Clear via service monitor after successful regen or DPF replacement.
Common Replacement Parts
- DPF Assembly P/N: 621-06-62100
Frequently Asked Questions
- Q: When does DPF need replacement vs cleaning?
If ash loading exceeds 200% or substrate is cracked/melted, DPF must be replaced. Soot can be burned off by regen, ash cannot.
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Source: truckmanualshub.com Komatsu PDF
Category: Heavy Equipment
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