Komatsu PC2000-8(21T-27-71175)Excavator Chain Sprocket Rim/final drive sprocket

Product Specifications

Komatsu PC2000-8(21T-27-71175)Excavator Chain Sprocket Rim/final drive sprocket

Here’s a detailed breakdown of the Komatsu PC2000-8 sprocket, including part numbers, maintenance guidelines, and sourcing options for this ultra-class mining excavator:

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Komatsu PC2000-8 Sprocket Specifications

• Type: Segmented sprocket (3-5 pieces) or one-piece design

• Teeth Count: 23-25 teeth (varies by configuration)

• Material: Forged 4140 steel with flame-hardened teeth (HRC 55-60)

• Mounting: Bolted to final drive hub (M30 or M36 bolts)

• Weight: ~300-400 kg per segment (full assembly ~1,200-1,500 kg)

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OEM Part Numbers

(Verify with your serial number at Komatsu Parts)

Complete Sprocket Assembly

• 722-51-20110 (3-piece segmented design)

• 722-51-20120 (updated 5-piece version)

Sprocket Segments

• 722-51-20131 (inner segment)

• 722-51-20132 (outer segment)

Hardware Kit

• Bolts: 07316-00520 (M30x3.5, grade 10.9)

• Nuts: 07347-60520 (hardened flange nuts)

• Washers: 07367-80520 (hardened flat washers)

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Aftermarket Alternatives

1. Premium Options:

   • Berco (Italy) – OEM-equivalent quality

   • ITR America – Mining-grade durability

   • ESCO – Hardened segmented designs

2. Cost Comparison:

   • OEM: $8,000\text{–}$12,000 (full assembly)

   • Aftermarket: $5,000\text{–}$9,000

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When to Replace

• Wear Indicators:

  • Teeth worn to <70% original thickness

  • "Hook" formation on tooth profile

  • Cracked root areas or bolt hole elongation

• Typical Lifespan: 10,000–15,000 hours (depends on abrasives in material)

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Replacement Procedure

1. Preparation:

   • Park on level ground, block tracks

   • Release track tension via grease cylinder

2. Removal:

   • Remove track chain using lifting equipment

   • Unbolt sprocket segments (impact gun @ 1,000 Nm)

   • Label segments for reassembly orientation

3. Installation:

   • Clean hub surface thoroughly

   • Apply Komatsu anti-seize (P/N 20Y-63-12200)

   • Torque bolts in staggered pattern to 1,100 Nm (810 lb-ft)

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Maintenance Tips

• Monthly Checks:

  • Measure tooth thickness with calipers

  • Inspect for cracks (dye-penetrant test if needed)

• Lubrication:

  • Final drive oil: ISO 100 (SAE 30)

  • Bolt threads: Molykote P37 paste

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Where to Buy

OEM Sources:

• Komatsu Parts Online

• Local Komatsu dealers (e.g., Komatsu America)

Aftermarket Suppliers:

• CQC:https://www.cqctrack.com/

• ITR: www.itramerica.com

• Undercarriage Parts Inc.: www.undercarriageparts.com

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Troubleshooting Guide

Issue	Likely Cause	Solution
Premature wear	Misaligned track	Check idler/sprocket alignment
Bolt failures	Under-torquing	Re-torque to spec with calibrated wrench
Vibration	Worn final drive splines	Inspect hub/spline engagement

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Need More Help?

For precise information:

1. Provide your machine serial number (located on right-front frame)

2. Specify if you need:

   • Exploded diagrams

   • Local supplier contacts

   • Torque sequence diagrams

Let me know how I can assist further!