Komatsu PC200 Undercarriage Parts: Tracks, Rollers & Idlers Explained

The undercarriage accounts for up to 50% of total excavator maintenance costs. For the Komatsu PC200—India's most popular excavator—understanding exactly when and what to replace can save lakhs of rupees per year.

The 6 Key Undercarriage Components

1. Track Shoes (Link Assembly) — The shoes (pads) that contact the ground. Available in standard, narrow, and wide configurations. Replace when grouser height drops below 50% of original.
2. Bottom Rollers (Track Rollers) — Support the machine weight on the track. The Komatsu PC200 has 7 bottom rollers per side (14 total). Replace when oil leak begins or when diameter drops by 5mm below spec.
3. Top Rollers (Carrier Rollers) — 2 per side, guide the track on the top. Replace when abnormal noise begins.
4. Front Idler — Guides the track at the front, acts as a tension wheel. Replace when diameter drops 8mm below spec or oil seal fails.
5. Sprocket — The drive wheel that meshes with the track links. Replace when tooth wear reaches 1/3 of original thickness.
6. Track Adjuster (Recoil Spring) — Maintains track tension. Adjust when track sag exceeds 20-30mm.

Komatsu PC200 Part Numbers Reference

Component	OEM Part No.	Replace Every
Bottom Roller	20Y-30-00300	3,000-5,000 hrs
Track Shoe (600mm)	20Y-32-00012	3,000-4,000 hrs
Front Idler Assembly	207-30-00170	4,000-6,000 hrs
Sprocket (13-tooth)	206-27-61120	2,000-3,000 hrs

Search all Komatsu PC200 undercarriage parts in our live catalogue with real-time stock status.