Komatsu-PC1250 final drive sprocket(P/N:KM2420,21N2731191,722-51-11120)heavy excavator crawler under carriage parts/china sprockets factory

Product Specifications

Komatsu-PC1250 final drive sprocket(P/N:KM2420,21N2731191,722-51-11120)heavy excavator crawler under carriage parts

Here's a comprehensive guide to KOMATSU PC1250 sprockets, covering OEM and aftermarket options, maintenance tips, and replacement guidance:

Komatsu PC1250 Sprocket Specifications

• Type: Final drive sprocket (segment-type or one-piece)

• Teeth Count: Typically 21-23 teeth (varies by model year)

• Material: Forged alloy steel with induction-hardened teeth

• Mounting: Bolted to final drive hub

• Weight: ~150-200 kg (depends on design)

OEM Part Numbers

(Always verify with your machine serial number)

• Complete Sprocket Assembly:

  • 722-51-11110 (older PC1250-6/7)

  • 722-51-11120 (updated design)

• Sprocket Segments:

  • 722-51-11130 (per segment)

• Hardware Kit:

  • Bolts: 07316-00412 (M24x2.5 flanged)

  • Nuts: 07347-50412 (prevailing torque)

Aftermarket Options

1. Premium Alternatives:

   • Berco (Italy) - Matches OEM quality

   • ITR (USA) - Durable mining-grade

   • VSE (Korea) - Cost-effective

2. Cost Comparison:

   • OEM: $5,000-$7,000

   • Aftermarket: $3,000-$5,000

When to Replace

• Wear Indicators:

  • Teeth become hook-shaped (>30% wear)

  • Bolt holes elongated

  • Cracks in root areas

• Service Life:

  • 8,000-12,000 hours (depends on conditions)

Replacement Guide

1. Preparation:

   • Block machine on level surface

   • Release track tension

2. Removal:

   • Remove track chain

   • Unbolt sprocket (impact wrench recommended)

   • Use lifting sling (1-2 ton hoist)

3. Installation:

   • Clean hub mating surface

   • Torque bolts to 750-800 Nm (550-590 lb-ft)

   • Use thread locker (Komatsu #1200B)

Maintenance Tips

• Monthly Inspection:

  • Check for loose bolts

  • Measure tooth thickness

• Lubrication:

  • Final drive oil (ISO 68 grade)

  • Grease bolts during reassembly

Where to Buy

1. OEM Sources:

   • Komatsu dealers (www.komatsu.com)

   • Official parts portal

2. Aftermarket:

   • Undercarriage specialists

   • Mining equipment suppliers

Troubleshooting

Need help with:

• Finding your exact sprocket type?

• Locating a local supplier?

• Installation torque specs?

Let me know your machine serial number for precise information!