PC200-6 PC220-6 6735-31-1110 6736-31-1110 6D102 Forged Steel Engine Crankshaft Compatible with Komatsu

1. Product Overview & Wholesale Price Range

The Komatsu 6D102 / S6D102 Forged Steel Engine Crankshaft Assembly (OEM Part # 6735-31-1110 / 6736-31-1110 / 6738-31-1110) is a high-tensile forged alloy steel main shaft engineered for 6-cylinder 5.9-liter turbocharged diesel engines operating under heavy excavation, earthmoving, and quarry loading conditions.

• Factory Wholesale Price: $320 – $750 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Material Specifications: 42CrMo Precision Forged Alloy Steel + Micro-nitrided journal hardening (HRC 55-60)
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for engine rebuild shop batch orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with dynamic balancing and fatigue test guarantee

2. Application Worksite Checklist (施工场景清单)

Engineered with high torsional stiffness to withstand continuous high-torque engine output across demanding jobsites:

• Heavy Earthmoving & Quarry Loading: Micro-polished journals ensure minimal friction under continuous high engine RPM on Komatsu PC200-6 excavators.
• Deep Foundation Excavation & Trenching: Induction hardened rod and main journals prevent journal scoring under heavy hydraulic torque loading.
• Highway Infrastructure & Grading Works: Precision dynamic balancing eliminates engine vibration, extending main bearing and oil seal service life.
• Demolition & Heavy Hammering Operations: High-tensile forged steel resists fatigue stress cracking caused by sudden engine shock loads.

3. Engine Crankshaft Troubleshooting & Diagnostic Guide (曲轴常见故障排查)

If your Komatsu 6D102 / S6D102 engine is exhibiting crankshaft or bearing journal failure, consult the diagnostic guide below:

• Fault 1: Main or Rod Bearing Journal Scoring & Deep Grooves (曲轴轴颈拉伤/磨损)
  Root Cause: Contaminated engine oil, oil starvation, or foreign metal particles grinding between the bearings and journals.
  Solution: Replace with a new factory-standard 6D102 forged steel crankshaft (OEM 6735-31-1110) rather than grinding under-size journals.
• Fault 2: Engine Metallic Knocking Noise & Rod Bearing Burnout (拉瓦/敲缸异响)
  Root Cause: Excessive journal oil clearance caused by long-hour fatigue wear, resulting in bearing spinning and rod journal damage.
  Solution: Install a new 6D102 crankshaft along with fresh main and connecting rod bearing shells.
• Fault 3: Crankshaft Fracture / Fatigue Cracking Across Web Fillets (曲轴疲劳断裂)
  Root Cause: Extreme engine overload, faulty torsional damper, or improper flywheel bolt torque.
  Solution: Replace with our heavy-duty forged alloy steel 6D102 crankshaft with reinforced fillet radiuses.
• Fault 4: Engine Oil Leakage From Front or Rear Crankshaft Oil Seals (前后油封渗油漏油)
  Root Cause: Deep wear grooves on the front/rear crankshaft seal journals or excessive shaft runout.
  Solution: Replace with a smooth micro-lapped 6D102 crankshaft and install new Teflon oil seals.
• Fault 5: Severe Engine Vibration & Dynamic Imbalance During Idle/Load (发动机剧烈抖动/不平衡)
  Root Cause: Crankshaft bending distortion or counterweight dynamic imbalance caused by rod failure.
  Solution: Replace distorted shaft with a 100% dynamically balanced 6D102 forged crankshaft assembly.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

Explore our factory-direct replacement components compatible with major global excavator brands:

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this 6D102 forged steel crankshaft fits my Komatsu PC200-6 excavator engine?
A: Check your original engine nameplate for engine models 6D102, S6D102, or OEM crankshaft casting numbers 6735-31-1110, 6736-31-1110. You can also send us your engine serial number for instant fitment verification.

Q2: What is the forging material and journal hardening depth of this 6D102 crankshaft?
A: Our 6D102 crankshafts are precision forged from 42CrMo alloy steel, featuring high-frequency induction-hardened main and rod journals (HRC 55-60) with a hardening depth of 3–5mm for high wear resistance.

Q3: Is this Komatsu 6D102 crankshaft dynamically balanced before shipment?
A: Yes, every single 6D102 crankshaft undergoes 100% dynamic balance testing and magnetic particle flaw inspection to ensure zero vibration and crack-free operation before shipping.