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KOMATSU PC120-6 Track Roller203-30-00210

Supplier: Racer Machinery

Brand: KOMATSU

OEM Available: Yes

Place of delivery: China

Payment: Credit / Debit cards; PayPal

Price: Chat Online

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excavator KOMATSU PC120-6 Track Roller203-30-00210

Part Number 203-30-00210 is actually the OEM part number for the KOMATSU PC120-6 Front Idler Assembly, not the Track Roller. This is a very common part number confusion in the aftermarket.TFqR

The correct OEM part numbers for KOMATSU PC120-6 Track Rollers are:TFqR

203-30-00140: Single Flange Lower Track Roller
203-30-00220: Double Flange Lower Track Roller
203-30-00150: Upper Carrier Roller

Below is the detailed information for the KOMATSU PC120-6 Lower Track Roller (the most commonly requested type), which is fully compatible with your machine.TFqR

KOMATSU PC120-6 Lower Track Roller (Bottom Roller)

Basic Information

Primary OEM Part Number: 203-30-00140 (Single Flange) / 203-30-00220 (Double Flange)
Alternative Part Numbers: 22B-30-00010, 2033000140, 2033000220, KM2794 (Berco)
Alternative Names: Bottom Roller, Track Support Roller, Lower Roller Assembly
Category: Excavator Undercarriage Parts - Track Support System
Original Manufacturer: KOMATSU

Compatible Models

This track roller fits the following KOMATSU construction equipment models:TFqR

PC100 Series: PC100-3, PC100-5, PC100-5C, PC100-5S, PC100-5Z, PC100-6, PC100-6E, PC100-6S, PC100-6Z
PC120 Series: PC120-3, PC120-5, PC120-5C, PC120-5S, PC120-5M, PC120-5Z, PC120-6, PC120-6E, PC120-6H, PC120-6J, PC120-6S, PC120-6Z, PC120LC-6
PC128 Series: PC128US-1, PC128US-2, PC128UU-1, PC128UU-2
PC130 Series: PC130-5, PC130-5S, PC130-6, PC130-7, PC130-8
PC138 Series: PC138US-8, PC138USLC-8, PC138USLC-10
Other: PC110R-1, CS210-1, JV100A-2T

Technical Specifications

Parameter	Value
Complete Assembly Weight	Approximately 22 kg (48.5 lbs)
Roller Body Material	Forged 50Mn / 40MnB high-strength boron steel
Surface Hardness	HRC 52-58 with 8-12mm deep hardened layer
Shaft Material	42CrMo alloy steel
Shaft Surface Roughness	Ra 0.2-0.4 (precision CNC polished)
Bushing Type	Bi-metal copper bushing (0.6mm thick copper layer)
Seal System	Double floating oil seal with 2% molybdenum content
Lubrication	Factory pre-lubricated with high-temperature lithium grease
Design Life	3000-4000 operating hours under normal conditions
Quantity per Machine	14 units total (7 per track: 5 single flange, 2 double flange)

Function: Supports the entire weight of the excavator, distributes load evenly to the track shoes, guides the track chain movement, and absorbs impact loads from uneven terrain.

Market Price & Availability

Chinese Aftermarket: $25 - $35 per unit (6 months to 1 year warranty)
European/American Aftermarket: $45 - $70 per unit (1-2 year warranty)
Genuine KOMATSU: $120 - $180 per unit
Major Aftermarket Brands: Berco, ITR, Blumaq, Costex Tractor Parts, A&S Machinery
Lead Time: 1-3 days for shipping from Chinese suppliers, 7-15 days for international delivery
Note: Sold individually. It is recommended to replace all track rollers on one side at the same time to ensure even wear.

Related Parts

203-30-00150: Upper Carrier Roller (Top Roller)
203-30-00210: Front Idler Assembly (the part number you initially mentioned)
07177-10050: Track Roller Seal Kit
203-30-56140: Mounting Bolt Kit
22B-30-11240: Matching Track Recoil Spring

Installation & Maintenance Precautions

Safety Warning: Always use proper lifting equipment when handling track rollers. Never work under an unsupported excavator.
Pre-Installation Check: Inspect the track frame mounting surfaces for cracks or excessive wear before installation.
Torque Specification: Tighten mounting bolts to 75-85 N·m in a crisscross pattern to ensure even pressure distribution.
Lubrication: Most modern track rollers are lifetime lubricated and do not require regular greasing. Do not attempt to add grease through the shaft.
Regular Inspection: Inspect track rollers every 250 operating hours for signs of oil leakage, excessive tread wear, or abnormal noise.
Replacement Timing: Replace immediately if:
- Tread wear exceeds 10mm
- Oil is leaking from the seals
- The roller is seized or makes grinding noises
- There are any cracks in the roller body
Debris Removal: Clean accumulated mud, rocks, and debris from around the track rollers regularly to prevent premature wear and seal damage.

Racer Machinery company provides genuine KOMATSU PC120-6 Track Roller203-30-00210. We guarantee that all parts are brand new products. You can directly consult us about the relevant content of KOMATSU PC120-6 Track Roller203-30-00210, such as size, weight, transportation, shipping costs, and so on.

We have been engaged in the aftermarket spare parts sales industry for many years. As a professional excavator parts supplier. The clients we collaborate with are located around the world, including Ghana, Cebu (Philippines), Madeira, Khakas, Algeria, Puerto Rico, and more. Not only KOMATSU PC120-6 Track Roller203-30-00210, we also have products such as turbochargers, PC50MR-2 hydraulic main pump, track link assy with shoes, PC200-8 Main Pump, PC400-7 6156-71-1111, etc. We have strong global sales capabilities for excavator parts. Looking forward to cooperate with you.