How to Choose the Perfect Excavator Modified Arm for Your Construction Site

A Contractor’s Guide to Selecting the Right Long-Reach or Specialized Arm

Excavator modified arms—such as long-reach booms, demolition arms, and telescopic dippers—can significantly enhance your machine’s capabilities. But choosing the right one requires careful consideration of machine compatibility, job requirements, and material strength.

Here’s your step-by-step guide to making the best decision.

1. Determine Your Primary Application

Different jobs demand different arms:

Pro Tip: If you work in marine or salty environments, opt for corrosion-resistant coatings.

2. Match the Arm to Your Excavator Model

Not all arms fit all machines. Check compatibility with:
✔ Excavator weight class (e.g., 20T, 30T, 45T)
✔ Hydraulic flow & pressure requirements
✔ Mounting pin sizes & geometry

Popular Models & Recommended Arms:

• CAT320/330: 18m–22m long-reach boom (Q690D steel)
• Komatsu PC300/400: 20m–26m demolition arm
• Hitachi ZX350: 14m–20m telescopic arm
• Sany SY365: Heavy-duty rock arm

3. Choose the Right Material & Build Quality

• Standard Use: Q355B steel (cost-effective for general digging)
• Heavy-Duty/Demolition: Q690D steel (higher strength, longer lifespan)
• Mining/Quarrying: Hardox 450 wear plates + reinforced pivot points

Key Features to Look For:
✔ Centralized lubrication (easy maintenance)
✔ Reinforced stress points (prevents cracking)
✔ OEM-compatible hydraulics (plug-and-play installation)

4. Consider Additional Upgrades

If you’re using heavy attachments (shears, grapples), ensure:
✔ Upgraded cylinders (larger bore for more power)
✔ Extra counterweight (for stability)
✔ Quick coupler compatibility (for fast tool changes)

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5. Get Expert Advice & Compare Options

Before purchasing:
✅ Ask for CAD drawings (verify fitment)
✅ Check lead times (standard: 15–30 days)
✅ Compare warranty (12+ months for premium arms)

Need Help Selecting?