Komatsu Final Drive Assembly Guide Introduction
If the drive assembly is damaged the machine maybe lost power on one side and move unevenly, or make very uncomfortable noises. This guide leads you to know the essentials of Komatsu final drive and how to make the right decision.
What is a Final Drive Assembly?
A final drive assembly is the powerhouse that drives your excavator’s tracks. It inculding two parts:
1: Hydraulic Motor is converts hydraulic pressure into mechanical energy.
2: Planetary Gear Reduction is multiplies torque so the excavator can move heavy loads smoothly. Together, these ensure reliable track propulsion, even in rough terrain or under heavy excavation work.
Common Komatsu Models and Their Final Drive Assemblies
Each Komatsu excavator model requires a specific final drive assembly. Here are some popular models and their matching parts:
| Komatsu Model | Part Number | Notes |
|---|---|---|
| PC200-7 | 20Y-27-31220 | Mid-size excavator, widely used |
| PC128UU-1 | 21Y-60-12101 | Compact model, direct fit |
| PC400 | 208-27-00230 | Large excavator, high torque |
| PC200-8MO | 20Y-27-00560 | Newer generation, improved design |
👉 Always confirm the part number before purchase to avoid compatibility issues.
Signs Your Final Drive Needs Replacement
Signs Your Final Drive Needs Replacement
Oil Leakage around the drive unit
Grinding or Clicking Noise during track movement
Uneven Power between left and right tracks
Weak Climbing Ability on slopes
Metal Shavings found in drained oil。
If these appear, replacing the whole final drive is often more reliable than repairing internal gears or seals.
Buying Tips for Komatsu Final Drives
First check the part number is exactly matches the excavator model and final drive code (e.g., 20Y-27-31220).
Secondly check OEM quality or aftermarket quality, the high aftermarket parts can offer cost savings. Supplier
The third check the cross reference, some Komatsu drives are interchangeable with other models—ask for a cross-reference list.
The fourth choose suppliers that specialize in Komatsu part to ensure durability and proper warranty.
Cross-Reference Quick Table
| Part Number | Common Use | Equivalent / Notes |
|---|---|---|
| 20Y-27-31220 | PC200-7 excavator | Widely available replacement |
| 21Y-60-12101 | PC128UU-1 excavator | Compact model drive motor |
| 208-27-00230 | PC400 excavator | Heavy-duty final drive |
| 20Y-27-00560 | PC200-8MO excavator | Newer type with improved efficiency |
Conclusion
The final drive assembly is the heart of your Komatsu excavator’s movement. A well-matched replacement restores full performance and helps avoid unexpected downtime. Always confirm part compatibility and source from trusted suppliers.
👉 Looking for Komatsu final drive assemblies? We supply a wide range of genuine and high-quality replacements for Komatsu models PC200, PC300, PC400, and more. Contact us today for a quote.