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The Internal Combustion Rail Grinding Machine NGM-4.9S is a portable, high-efficiency tool engineered to restore rail surface smoothness. Powered by an 18HP four-stroke gasoline engine, it eliminates defects like rust, weld bumps, and minor wear—common issues that cause wheel-rail noise, increased fuel consumption, and safety hazards. Unlike electric grinders (reliant on external power), the NGM-4.9S offers unrestricted mobility, making it ideal for remote railway sections or emergency on-site grinding.
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• Independent Power Supply: 18HP engine supports 8–10 hours of continuous grinding on a 15L fuel tank, no need for power cables.
• Uniform Grinding Precision: 4 grinding heads (adjustable angle 0–15°) ensure even material removal, achieving a surface roughness of Ra ≤ 6.3μm.
• Compact & Maneuverable: Weighing 85kg and equipped with rubberized wheels, it can be moved along rails by a single operator.
• Durable for Harsh Conditions: Engine air filter and dust-proof covers protect internal components from sand, dust, and moisture.
The NGM-4.9S allows micro-adjustments of grinding depth (0.1–1mm) to target specific defects—e.g., 0.2mm for rust removal, 0.8mm for weld bump grinding. The grinding speed (1,800–2,400 RPM) is also adjustable, ensuring optimal performance on different rail materials (e.g., U71Mn, U75V).
A built-in cyclone dust collector captures 80% of grinding debris, reducing cleanup time and preventing dust inhalation (critical for operator health). The engine also features a muffler, lowering noise levels to ≤85dB—compliant with urban noise regulations for subway and suburban railway work.
The machine has a dead-man switch (stops grinding if the operator releases the handle) and anti-vibration handles, reducing operator fatigue during long shifts. It also includes a rail guide wheel to ensure the grinding heads stay aligned with the rail top and sides.
• Post-welding grinding (removing weld beads to create smooth rail transitions).
• Routine rail maintenance (eliminating rust, corrosion, and minor scratches).
• Emergency repairs (fixing rail surface damage caused by wheel flats or debris impacts).
• Regional railway lines (frequent freight traffic causing heavy wear).
• Subway and light rail systems (urban areas requiring low-noise operation).
• Mining and industrial rails (harsh environments with high dust and corrosion).
Can the NGM-4.9S grind both the rail top and sides?
Yes. It comes with 4 grinding heads: 2 for the rail top (to address wear) and 2 for the sides (to remove rust and corrosion). The angle of the side grinding heads can be adjusted between 0–15° for optimal coverage.
What type of fuel does the engine use?
It uses regular unleaded gasoline (92# or higher) and 10W-30 engine oil. We recommend using high-quality fuel and oil to extend the engine’s lifespan (service life of 3,000+ operating hours with proper maintenance).
Is it difficult to transport the machine to remote work sites?
No. It has a detachable design (grinding head and engine can be separated) and weighs 85kg total. It can be loaded into a small truck or trailer, and two operators can carry the separated components over short distances.
How often do the grinding wheels need to be replaced?
Replacement frequency depends on usage: typically every 200–300 meters of grinding for standard wheels (for rust/light wear) or 100–150 meters for heavy weld grinding. The machine includes a wheel wear indicator to alert operators when replacement is needed.
• Independent Power Supply: 18HP engine supports 8–10 hours of continuous grinding on a 15L fuel tank, no need for power cables.
• Uniform Grinding Precision: 4 grinding heads (adjustable angle 0–15°) ensure even material removal, achieving a surface roughness of Ra ≤ 6.3μm.
• Compact & Maneuverable: Weighing 85kg and equipped with rubberized wheels, it can be moved along rails by a single operator.
• Durable for Harsh Conditions: Engine air filter and dust-proof covers protect internal components from sand, dust, and moisture.
The NGM-4.9S allows micro-adjustments of grinding depth (0.1–1mm) to target specific defects—e.g., 0.2mm for rust removal, 0.8mm for weld bump grinding. The grinding speed (1,800–2,400 RPM) is also adjustable, ensuring optimal performance on different rail materials (e.g., U71Mn, U75V).
A built-in cyclone dust collector captures 80% of grinding debris, reducing cleanup time and preventing dust inhalation (critical for operator health). The engine also features a muffler, lowering noise levels to ≤85dB—compliant with urban noise regulations for subway and suburban railway work.
The machine has a dead-man switch (stops grinding if the operator releases the handle) and anti-vibration handles, reducing operator fatigue during long shifts. It also includes a rail guide wheel to ensure the grinding heads stay aligned with the rail top and sides.
• Post-welding grinding (removing weld beads to create smooth rail transitions).
• Routine rail maintenance (eliminating rust, corrosion, and minor scratches).
• Emergency repairs (fixing rail surface damage caused by wheel flats or debris impacts).
• Regional railway lines (frequent freight traffic causing heavy wear).
• Subway and light rail systems (urban areas requiring low-noise operation).
• Mining and industrial rails (harsh environments with high dust and corrosion).
Can the NGM-4.9S grind both the rail top and sides?
Yes. It comes with 4 grinding heads: 2 for the rail top (to address wear) and 2 for the sides (to remove rust and corrosion). The angle of the side grinding heads can be adjusted between 0–15° for optimal coverage.
What type of fuel does the engine use?
It uses regular unleaded gasoline (92# or higher) and 10W-30 engine oil. We recommend using high-quality fuel and oil to extend the engine’s lifespan (service life of 3,000+ operating hours with proper maintenance).
Is it difficult to transport the machine to remote work sites?
No. It has a detachable design (grinding head and engine can be separated) and weighs 85kg total. It can be loaded into a small truck or trailer, and two operators can carry the separated components over short distances.
How often do the grinding wheels need to be replaced?
Replacement frequency depends on usage: typically every 200–300 meters of grinding for standard wheels (for rust/light wear) or 100–150 meters for heavy weld grinding. The machine includes a wheel wear indicator to alert operators when replacement is needed.
