SLYM SM140 Hydraulic Rock Breaker for 20t-27t Excavators | Top Type Demolition Hammer
Product Description
Engineering Highlights: Why SLYM SM140?
1. Optimized Piston Stroke Technology The SM140 features an extended piston stroke designed to maximize blow force. Combined with our precision-ground cylinder, this reduces internal friction and enhances energy transfer from the piston to the chisel.
2. High-Grade Alloy Steel Chisels Our 140mm chisels undergo deep-heat treatment to achieve the perfect balance between hardness and toughness. Whether you are breaking granite or reinforced concrete, the SLYM chisel resists wear and prevents premature snapping.
3. Advanced Accumulator & N2 System Equipped with a high-reliability accumulator, the SM140 compensates for pressure pulsations in the hydraulic circuit. The compact nitrogen chamber ensures consistent impact power even in fluctuating temperatures.
4. Reinforced Through-Bolt Structure Four through-bolts securely lock the front head, cylinder, and back head. This rigid structure prevents misalignment and ensures the breaker can withstand the lateral forces of heavy demolition.
Typical Applications
Mining & Quarrying: Primary breaking of medium-hard rock and secondary boulder reduction.
Infrastructure: Demolition of bridge abutments, reinforced concrete foundations, and tunneling.
Construction: Heavy-duty building demolition and site preparation.
Metallurgy: Clearing slag and removing furnace linings.
Technician's Maintenance Tip for SM140
To maximize the lifespan of your SM140, our technical team recommends:
The 5mm Rule: Monitor the gap between the 140mm chisel and the bushing. If the clearance exceeds 5mm, replace the bushing immediately to prevent piston damage.
Storage Protocol: If the breaker will be idle for over 7 days, release the nitrogen gas and push the piston into the cylinder to prevent rust on the precision-machined surfaces.
Spare Parts & Support
SLYM offers a complete range of spare parts, including:
Chisels and pins
Accumulator assemblies
Mounting kits
Bushings
A full after-sales support network ensures ready access to replacement parts, maintenance advice, and technical assistance.
Technical Data Sheet
| Items | Units | SM140 |
| Operating Weight | kg ibs | 1,705 3,715 |
| Operating Pressure | kgf/cm2 psi | 160~180 2,275~2,559 |
| Oil Capacity | l/min gpm | 120~150 31.7~39.6 |
| Impact Rate | bpm | 400~490 |
| Impact Energy | ft ibs Joules | 3,500 4,760 |
| Chisel Diameter | mm inch | 140 5.5 |
| Hose Size | mm inch | 25 PF1" |
| Suitable Excavator | ton ib m3 ft3 | 22~27 48,501~59,585 0.8~1.0 28.24~35.30 |
Technical FAQ
Q1: Why is my hydraulic oil turning black?
The Technician's Answer: "Black Oil" is a warning sign that contaminants are entering your system. This is usually caused by two things:
Aged Seals: If you haven't replaced your seal kits in over 6 months, the rubber begins to wear down into microscopic black particles.
Clogged Exhaust Screw: If the breather/exhaust screw is blocked by a mix of grease and dust, the waste cannot escape and gets forced back into the hydraulic circuit.
Solution: Replace the seal kit immediately and clean the exhaust screw with solvent.
Q2: My hydraulic hoses are jumping or vibrating violently. What's wrong?
The Technician's Answer: This is a classic symptom of a gas leak. When the nitrogen (N2) pressure in the back head or accumulator is too low or has leaked out entirely, the breaker loses its "cushion," causing the hydraulic oil to pulsate violently through the hoses.
Solution: Stop operation immediately. Check the nitrogen pressure and refill to the levels specified in your SLYM manual.
Q3: Why did my chisel (tool) or piston chip/break at the striking face?
The Technician's Answer: This is almost always caused by excessive clearance.
Check the gap between your chisel and the bushing. If it is greater than 5mm, the chisel will "tilt" or wobble inside the hammer.
When the piston hits a tilted chisel, the force is concentrated on one edge rather than the center. This causes "pitting" or metal chunks to fly off.
Solution: Replace bushings once they hit the 5mm wear limit.
Q4: My hydraulic breaker has lost power and is hitting "weak." Why?
The Technician's Answer: Before blaming the cylinder, check these three things:
Nitrogen Pressure: Too much gas pressure can actually prevent the piston from traveling its full stroke; too little gas reduces the impact force.
Oil Temperature: If your oil is overheating (above 80°C), it loses viscosity, leading to internal pressure bypass.
Worn Seals: Internal leakage across the piston seals will reduce the striking power significantly.
Q5: What causes the tie-rods (through-bolts) to snap?
The Technician's Answer: The #1 killer of through-bolts is "Dry Firing" (firing the hammer without pressure on the chisel) or improper torque.
When you dry fire, the energy that should go into the rock goes into the hammer's own bolts and pins instead.
Solution: Ensure operators apply firm downward pressure before triggering. Check bolt torque every 50 operating hours.
Q6: How should I store my hydraulic breaker for the winter or off-season?
The Technician's Answer: Never leave it exposed to the elements.
Push the Piston Up: This is the most important step. By pushing the piston into the cylinder, you keep the polished metal surfaces coated in oil and safe from rust.
Bleed Nitrogen: This makes it easier to retract the piston and saves the seals from constant pressure.
Plug the Ports: Use steel plugs on all hose connections to keep moisture out.
Need more help?
If your issue isn't listed here, our technical team is ready to assist.
Email: info@slymmachinery.com
Parts Inquiry: https://www.slymmachinery.com/Product-Information-dc68998.html