Komatsu excavator PC850(209-27-51173) rock drive sprocket rim/Segment group Excavators KOMATSU PC850LC
Product Specifications
Segment group Excavators KOMATSU PC850LC(209-27-51173)final drive sprocket critical part of the undercarriage system.
The Komatsu PC850 is a large excavator, and its rock sprocket (also called a sprocket segment group or track sprocket) is a critical part of the undercarriage system. Here's what you need to know:
1. What is a Rock Sprocket (Sprocket Segment Group)?
The rock sprocket is the toothed wheel that drives the track chain.
On large excavators like the PC850, the sprocket is often made in segments (replaceable wear parts) rather than a single solid piece.
Function: Engages with track chain links to propel the machine.
2. Komatsu PC850 Sprocket Specifications
Model Variations: PC850-1, PC850-2, PC850-3, etc. (confirm your exact model).
Material: Hardened steel for durability.
Segment Design: Typically 3–5 bolt-on segments for easy replacement.
3. Where to Buy a Komatsu PC850 Rock Sprocket
OEM Parts (Komatsu Genuine)
Komatsu dealers (best for exact fit, but expensive).
Part Number Example: Check manuals or dealer listings (e.g., 209-27-51173).
Aftermarket Options (Cost-Effective)
CQC-TRACK&DPW-PARTS – High-quality aftermarket undercarriage suppliers.
Track Shop, Vema Track, Finning – Reliable distributors.
Online Marketplaces
eBay, Alibaba, MachineryTrader – For new/used sprockets.
Local undercarriage specialists – May offer rebuilt segments.
4. Signs You Need a Replacement
Worn or broken teeth (causes track slippage).
Cracks or excessive wear (leads to track damage).
Uneven wear (indicates misalignment or track issues).
5. Replacement Tips
✔ Inspect the track chain – Worn chains accelerate sprocket wear.
✔ Check bushings & rollers – A full undercarriage inspection is wise.
✔ Torque bolts properly – Segments must be securely fastened.
Next Steps
Confirm your PC850 model (e.g., PC850-6).
Check part numbers (from service manual or dealer).
Compare OEM vs. aftermarket (cost vs. longevity).
