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YN27C Gasoline Rock Drill (Portable Drill Without Air Compressor)
- Technical Specifications
The YN27C Gasoline Rock Drill (often referred to as the Pionjar-style internal combustion rock drill) is an industry-standard, hand held portable rock drill machine. Powered by a rugged 2-stroke petrol engine, this 27kg unit operates entirely independently, requiring no air compressor and no electricity. It is the premier choice for contractors needing a high-impact rock drilling solution in remote areas where transporting heavy pneumatic equipment is impossible.
💡 Expert Field Tip for YN27C Operators
For maximum engine life in high-altitude mining (above 3,000m), we recommend adjusting the carburetor mixing screw for leaner fuel delivery. Always use a 12:1 gasoline-to-oil ratio during the initial 50-hour break-in period to ensure internal components are properly lubricated before switching to standard high-speed operation.
Applications: From Remote Mining to Disaster Relief
Mountainous Quarrying: The perfect gas powered rock drill for granite, limestone, and marble extraction where roads for compressors don't exist.
Foundation Work: Ideal for telecom tower foundations, fence post holes, and seismic exploration drilling.
Infrastructure Maintenance: Used extensively in asphalt breaking, concrete tamping, and railway ballast compaction.
Emergency Rescue: A critical tool for fire departments and rescue teams for breaking debris in post-earthquake or landslide zones without power grids.
Key Features of the Expandag YN27C
Total Independence: No air hoses, no external power packs. The 185cm³ engine provides all the impact energy needed for hard rock penetration.
Dual-Mode Versatility: A simple lever flick switches the machine from Drilling Mode (rotation + impact) to Breaking Mode (impact only).
Precision Control: Drills vertical or downward boreholes up to 6 meters deep (28mm-42mm diameter) with consistent torque.
Cold Start Reliability: Equipped with a robust pull-start system and specialized seals for reliable performance in sub-zero temperatures.
Economic Analysis: YN27C vs Pneumatic Systems
Why contractors are switching to gasoline-powered solutions for remote sites:
| Feature | YN27C Gasoline Drill | Pneumatic Drill (e.g. YT28) |
|---|---|---|
| Power Requirement | Internal Combustion (Self-contained) | External Diesel Air Compressor |
| Logistics Cost | Low (Fits in a standard car trunk) | High (Needs towing/truck for compressor) |
| Setup Complexity | 30-second start-up | Connecting hoses, warming compressor |
| Site Suitability | Vertical Mountains / Remote Rescue | Fixed Quarries / Near Power Supply |
Technical Data & Performance Specs
| Technical Parameter | Specification Data |
|---|---|
| Weight | 27 kg |
| Engine Displacement | 185 cm³ |
| Max Drilling Depth | 6 Meters |
| Drilling Speed | ≥ 250 mm/min (Hard Granite) |
| Shank Dimensions | Hex 22 x 108 mm |
Genuine YN27C Parts & Worldwide Shipping
Expandag maintains a massive inventory of YN27C genuine spare parts to ensure your project never stops. We provide global door-to-door shipping for:
| Engine & Ignition Components | Drilling & Impact Assemblies |
|---|---|
| Cylinders, Spark Plugs, & Carburetors | Impact Pistons & Rotation Sleeves |
| Piston Kits (Pin, Rings, & Clips) | Ratchet Wheels & Needle Bearings |
| Ignition Coils & Magneto Flywheels | Recoil Starter Springs & Ropes |
Complete Drilling & Cracking Solutions
The YN27C is an essential tool in our "Drill & Crack" ecosystem. For vibration-free rock fragmentation, use the YN27C to drill the pattern, then apply our HSCA (Expansive Mortar) for a silent breaking solution. We also provide specialized tapered button bits and rods engineered specifically for gasoline-powered drills.
Portable Gasoline Rock Drill & YN27C Technical FAQ
Q: Is the YN27C rock drill easy to maintain?
A: Yes. It is a compact integrated design with a built-in air compressor, so no external hoses are needed. Maintenance focuses on the engine, air compressor, and rock drill unit: regular cleaning of the spark plug and carburetor, carbon removal from piston rings and cylinder, and inspection of impact components. Proper maintenance ensures hundreds of hours of reliable operation.
Q: What is the drilling speed of a petrol rock drill?
A: In hard granite, the YN27C can achieve a drilling speed of over 250mm per minute, making it one of the most powerful portable units in its class.
Q: Can I use standard gasoline?
A: Yes, standard 90+ octane gasoline mixed with high-quality 2-stroke oil (12:1 ratio) is the standard requirement for peak performance.
Q: What is the maximum drilling depth for the YN27C?
A: The YN27C is designed to drill boreholes up to 6 meters deep. For optimal efficiency in hard rock, we recommend using tapered drill rods and button bits between 32mm and 42mm in diameter.
Q: What is the fuel consumption rate for remote quarrying?
A: The fuel consumption is approximately 0.12L per meter drilled. This makes the YN27C highly cost-effective for remote sites where transporting large amounts of fuel or heavy equipment is difficult.
Q: Does the gasoline rock drill work at high altitudes?
A: Yes, the YN27C is widely used in mountainous mining projects. For altitudes above 3,000 meters, we recommend a slight adjustment to the carburetor's air-to-fuel mixture to maintain consistent power.
Q: Do you ship YN27C spare parts to Africa and South America?
A: Absolutely. We maintain a full inventory of genuine cylinders, pistons, and spark plugs. We offer express international shipping to mining hubs in South Africa, Peru, Chile, and across Southeast Asia.
Q: Can this drill truly operate without an air compressor?
A: Yes. The YN27C is an internal combustion machine. The engine provides both the percussion (impact) and the rotation. It is a 100% independent solution requiring no external power or air hoses.
Q: Can the YN27C be used for breaking concrete as well?
A: Yes. By simply switching the adjustment lever, you can disable the rotation and use the machine as a heavy-duty breaker for concrete demolition, tamping, and railway ballast work.
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ENGINEER'S CHOICE
YN27C Technical Support Guide
Struggling with starting issues or power loss? Read our latest deep-dive:
YN27C Troubleshooting & Repair Manual
