The YT28 Air-Leg Rock Drill is a widely adopted pneumatic tool in the global mining industry. Known for its proven performance and highly durable configuration, this pusher-leg drill is a common choice for railway, highway, and underground mining roadway excavation.
In short, the YT28 combines a large cylinder capacity with straightforward maintenance, making it an efficient tool for blast-hole drilling in medium-hard to hard rock (f=8–18).
🎬 Video Summary: Watch the YT28 pneumatic rock drill in underground action, demonstrating stable thrust and fast penetration rate in hard rock.
| Feature | YT28 (Classic) | YT27 (Stable) | YT29A (Heavy-Duty) |
|---|---|---|---|
| Weight | 26.5 kg | 27 kg | 26.5 kg |
| Impact Energy | ≥ 70–78 J | ≥ 75.5 J | ≥ 78 J |
| Best Application | General tunneling | Steady drilling | High-speed advance |
📄 Download YT28 Technical Data Sheet (PDF)
| Parameter | Value | Unit |
|---|---|---|
| Working Air Pressure | 0.40 ~ 0.63 | MPa |
| Impact Energy (@ 0.63 MPa) | ≥ 70 - 78 | J |
| Air Consumption | ≤ 81 | L/s |
| Drilling Speed | ≥ 250 - 470 | mm/min |
| Core Spare Part | System / Function |
|---|---|
| Piston (80-82mm) | Main Drill: High-frequency impact. |
| Rifle Bar & Nut | Main Drill: Internal rotation control. |
| Valve Chest Assembly | Main Drill: Pneumatic air distribution. |
| Water / Air Tube | Main Drill: Wet drilling dust suppression. |
| O-Ring & Seal Kit | Consumable: Prevents internal pressure loss. |
Use the powerful YT28 to drill blast holes, then apply our Expandag Soundless Cracking Agent for silent rock breaking.
Q1: Is the YT28 suitable for underground mining?
A: Yes, the YT28 is a preferred choice for underground tunneling and mining roadway excavation. For these environments, wet drilling is mandatory to ensure effective dust suppression and maintain breathable air quality. Always use a water separator to keep the pneumatic system dry.
Q2: Why is my YT28 penetration speed dropping?
A: A drop in drilling speed is usually caused by three factors: dull drill bits that require re-sharpening, fluctuating air pressure (below 0.4 MPa), or insufficient lubrication from the FY250B oiler. Check your air supply and oil levels first.
Q3: Are YT28 spare parts compatible globally?
A: Yes. All YT28 components from Expandag are manufactured strictly according to the original technical drawings. This ensures 100% inter-compatibility with other industry-standard YT28 rock drills worldwide, including the Piston, Valve Chest, and Rifle Bar.
Q4: What is the main difference between the YT28 and YT29A?
A: The YT28 is the classic, versatile standard with an air consumption of ≤81 L/s, ideal for general tunneling. The YT29A is a heavy-duty upgrade delivering higher impact energy (≥78J), making it faster for penetration in extremely hard rock (f=15–18) compared to the YT28.
Q5: What size air compressor do I need to run a single YT28 rock drill?
A: To achieve maximum efficiency, we recommend an air compressor that provides a stable delivery of at least 5 m³/min (approx. 175-180 CFM) at a working pressure of 0.63 MPa (90 PSI). Using a smaller compressor may result in weak impact and jammed drill steels.
Q6: How can I prevent the YT28 from freezing in high-humidity sites?
A: Pneumatic tools often freeze due to rapid air expansion. To prevent this, ensure your air line has an effective water separator and use specialized anti-freeze rock drill oil in the lubricator. This maintains high-frequency operation even in cold or humid tunnel environments.
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