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3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER

3115027400 Gear Wheel for Atlas Copco COP SC25 HE and Compatible Rock Drills

Part number 3115027400 (also written 3115 0274 00) is the gear wheel used in the rotation system of Atlas Copco COP SC25 HE hydraulic rock drills, and it also fits several other COP models. It is machined from hardened alloy steel with an internal spline that locks onto the drive shaft, so torque goes where it should instead of slipping or wearing out the shaft.

If your drill has lost rotation speed, is running hot, or you are hearing unusual noise from the gearbox area, a worn gear wheel is often the cause. Replacing it before it damages the shaft or neighbouring gears is usually the cheaper route.

  • Tooth geometry machined to match the original, so it meshes without binding
  • Heat-treated for wear resistance in continuous drilling
  • Internal spline keeps alignment with the drive shaft
  • Weighs about 0.85 kg, easy to handle during maintenance
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Key Advantages

Built for Reliability in the Field

Each part is engineered and QC'd against the exacting standards your equipment demands.

Tooth profile

is CNC-machined to match the original, which cuts vibration and noise during rotation instead of producing that grinding feel after a cheap replacement

Hardened

alloy steel body resists deformation under repeated torque loads, so the gear holds its shape through long shifts in hard rock

Internal

spline seats firmly on the drive shaft, reducing slippage and protecting the shaft from premature wear

Engineered Around Your Workflow
Feature

Engineered Around Your Workflow

Part number 3115027400 (also written 3115 0274 00) is the gear wheel used in the rotation system of Atlas Copco COP SC25 HE hydraulic rock drills, and it also fits several other COP models. It is machined from hardened alloy steel with an internal spline that locks onto the drive shaft, so torque goes where it should instead of slipping or wearing out the shaft.

If your drill has lost rotation speed, is running hot, or you are hearing unusual noise from the gearbox area, a worn gear wheel is often the cause. Replacing it before it damages the shaft or neighbouring gears is usually the cheaper route.

  • Tooth geometry machined to match the original, so it meshes without binding
  • Heat-treated for wear resistance in continuous drilling
  • Internal spline keeps alignment with the drive shaft
  • Weighs about 0.85 kg, easy to handle during maintenance
Where It Works
Feature

Where It Works

  • Underground mining drill rigs running COP SC25 HE and similar hammers
  • Quarry and aggregate drilling where rigs run long shifts in abrasive rock
  • Tunnel and underground civil works, including metro, road and hydropower tunnels
  • Foundation and anchoring work on heavy construction sites
  • Rotation system repairs and preventive maintenance on Boomer and Rocket Boomer rigs
Real World

Trusted Across Industries

From mining fleets to manufacturing lines, this part ships globally and runs under load.

Proven in thousands of installations across mining, construction, energy and heavy manufacturing. Designed for 24/7 operation and backed by a responsive engineering support team.

Gallery

Detailed Visual Reference

Inspect every critical surface, tolerance and finish before you commit.

3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
3115027400 EPIROC ROCK DRILL DRIFTER PARTS COP SC25 HE GEAR WHEEL 3115 0274 00 HAMMER gallery
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Specifications

Technical Specifications

Key parameters below. Full dimensional drawings, tolerance sheets and material certificates available on request.

Part Number
3115027400 / 3115 0274 00
Component Type
Gear wheel, transmission gear
Fits
Atlas Copco COP SC25 HE rock drill rotation system
Material
Hardened alloy steel
Manufacturing
CNC machining, heat treated
Gear Type
External spur gear with internal spline
Weight
Approx. 0.85 kg
Compatible Models
COP SC25 HE, COP 1638HD+, COP 2560+, COP 1838HD+, COP 1838HD, COP 2560EX+, Boomer and Rocket Boomer rigs
FAQ

Questions Buyers Often Ask

Will this gear wheel fit my COP SC25 HE?
It is the gear wheel for the COP SC25 HE rotation system, and the same part number is used on several other COP models listed above. Machine configuration and production year can affect fit, so check your parts manual or send us your serial number before ordering and we will confirm.
Is this a genuine Atlas Copco part?
No. This is an aftermarket replacement made to the original specifications. It is not branded or packaged by Atlas Copco. If you need a genuine part number, we can tell you what to look for, but we supply the aftermarket equivalent at a lower price.
What usually fails first on this gear wheel?
Tooth wear and surface cracking are the most common. Once teeth start to pit or chip, engagement gets rough, vibration goes up, and the shaft and bearings take the load. That is why we recommend checking the teeth at every rotation-unit service rather than waiting for a breakdown.
Can I install it myself?
If your team already does rotation-unit repairs, yes. Clean the mounting surfaces, align the spline with the drive shaft, seat the gear fully and torque the assembly to the manufacturer's figures. If you are unsure about preload or alignment, have a technician do it, because a misaligned gear will fail early.
How fast can you ship, and how is it packed?
Orders usually leave within 5 working days, and we ship worldwide. Gears are packed to protect the teeth in transit. Delivery time after dispatch depends on destination and customs, so ask us for a transit estimate for your country.
Do you supply other parts for the same drill?
Yes. We carry a range of consumables and wear parts for COP rock drills, including seals, bushings and other transmission components. Send us a parts list or the model and serial number and we will quote what you need together, which usually saves on freight.