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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.EKmR

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

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.EKmR

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:EKmR

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 Guatemala, Wroclaw (Poland), Dusseldorf (Germany), Wellington (New Zealand), Halifax (Canada), Medellin (Colombia), and more. Not only KOMATSU PC120-6 Track Roller203-30-00210, we also have products such as engine water pump assy, PC200-8 Main Pump, PC400-7 6156-81-8170 parts turbocharger, Engine Assebly, hydraulic pump union, etc. We have strong global sales capabilities for excavator parts. Looking forward to cooperate with you.