Komatsu excavator PC300(KM1429,2073000150,2073000511)track roller/komatsu track rollers parts/flanged track rollers/DPW-parts

Product Specifications

Komatsu excavator PC300(KM1429,2073000150,2073000511)track roller/komatsu track rollers parts/flanged track rollers

Here's a detailed technical breakdown of Komatsu PC300 Bottom Rollers, covering all generations (PC300-5 through PC300-11):

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Komatsu PC300 Bottom Roller Specifications

(Verify with your serial number at Komatsu Parts)

1. Model Compatibility

PC300 Generation	OEM Part Number	Rollers per Side
PC300-5/PC300LC-5	20Y-70-21110	7
PC300-6/PC300LC-6	20Y-70-21120	7
PC300-7/PC300LC-7	20Y-70-21130	8 (LC models)
PC300-8/PC300LC-8	20Y-70-21140	8
PC300-10/PC300LC-10	20Y-70-21150	9 (LC models)

2. Technical Specifications

Parameter	OEM Standard	Aftermarket Equivalent
Material	SCr440 Forged Steel	42CrMo Alloy Steel
Weight	34-38 kg	32-40 kg
Outer Diameter	180±0.5 mm	178-182 mm
Width	68±0.3 mm	66-70 mm
Bearing Type	Tapered Roller	Double-Sealed Ball
Load Capacity	9,000 kg (static)	8,500-10,000 kg

3. Wear Limits & Maintenance

• Flange Thickness:

  • New: 22-25 mm

  • Replace at: ≤12 mm

• Bearing Play:

  • Allowable: ≤1.2 mm radial

  • Critical: >1.5 mm

• Greasing:

  • Interval: Every 50 hrs

  • Grease Type: Komatsu GL-2 or equivalent

  • Volume: 120-150cc per roller

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Visual Identification Guide

1. OEM Markings:

   • Laser-etched "KOMATSU" + part number

   • Blue paint stripe (genuine parts)

2. Aftermarket:

   • Berco: "BERCO" stamped + yellow zinc plating

   • ITR: "ITR" logo + red oxide primer

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Replacement Procedure

Tools Required:

• 1" impact wrench (for M16 bolts)

• 10-ton jack stand

• Track press (if removing chain)

Step-by-Step:

1. Release track tension (grease cylinder)

2. Remove track chain (if needed)

3. Unbolt old roller (180-200 Nm torque)

4. Clean mounting surface

5. Install new roller with anti-seize compound

6. Torque bolts in crisscross pattern

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OEM vs Aftermarket Comparison

Factor	OEM	Premium Aftermarket
Price	$480-680	$350-550
Lead Time	2-4 weeks	1-2 weeks
Warranty	12 months	6-12 months
Bearing Life	8,000-10,000 hrs	6,000-9,000 hrs
Seal Effectiveness	95%+	85-90%

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Recommended Suppliers

1. OEM:

   cqctrack&DPW-parts

   • Local Komatsu dealers

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Troubleshooting Guide

Symptom	Root Cause	Solution
Uneven track wear	Misaligned rollers	Replace entire set
Grinding noise	Failed bearings	Immediate replacement
Grease leakage	Seal damage	Rebuild with new seals
Roller not turning	Corrosion/contamination	Clean and regrease

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Pro Tips

1. Always replace rollers in matched sets (minimum both sides)

2. PC300LC models may require different spacing than standard

3. For mining applications, consider HD versions with thicker flanges

4. Keep 1-2 spare rollers for emergency replacements

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Need Exact Part Verification?
Provide:

• Machine serial number (located on right frame)

• Current roller photos (showing wear patterns)

• Application (e.g., mining, construction)

I can then provide generation-specific diagrams or local supplier contacts!