Applicable Systems
PC200 Excavator
Symptoms
Engine suddenly loses power and emits black smoke under load.
Possible Causes
- Turbocharger compressor blade damaged or intake hose leaking.
- Fuel injection timing retarded due to worn cam sensor.
- Air filter severely clogged reducing intake air mass.
Troubleshooting Steps
- Step 1: Inspect turbo compressor wheel for blade tip damage.
Blades intact; no contact marks on housing. - Step 2: Check intake hose clamps and intercooler for oil traces.
No leaks; pressure test holds 200 kPa without decay. - Step 3: Measure injection timing with timing light per service manual.
Timing within ±1° of specification at idle. - Step 4: Check air filter restriction indicator.
Indicator not red; filter vacuum < 3.5 kPa.
How to Reset
Replace turbocharger or intake hose; adjust timing; replace air filter if restricted.
Common Replacement Parts
- Turbocharger 6156-81-8170: Turbocharger 6156-81-8170
- Air Filter 600-185-5100: Air Filter 600-185-5100
Frequently Asked Questions
- Q: Can a damaged turbo destroy the engine?
Yes, blade fragments can enter cylinders and cause piston failure.
- Q: How often replace the air filter?
Every 500 hours or when restriction indicator activates.
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Source: Komatsu PC200-8 Engine Shop Manual
Category: Heavy Equipment
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