Drumcutters Transverse & Longitudinal Drum Cutters
Drumcutters are an alternative to hydraulic breakers by generating higher productivity in several applications. They are designed to achieve optimum performance and precision when removing materials offering low noise and less vibration; critical when working in sensitive environments. Drumcutters consist of extremely robust spur gears driven by high torque hydraulic motors to be used in the most challenging conditions with little to no risk of failure.
Adding value to your excavator:
Specifically designed for grinding rock, concrete and wood.
|Rotary drum cutters or rock cutters are hydraulic excavator attachments designed to increase the range of work available to excavators and increase their return on investment.
How to choose the correct size rock cutter for my excavator? Matching the correct size rock cutter with the excavator is important.
- the rock cutter must be strong enough to take the weight of the excavator and the excavator must be strong enough to take the energy transmitted back into the machine from the drum cutter
- the weight of the rock cutter must not destabilize the excavator
- rock cutters get their power from the hydraulic flow and pressure from the excavator. Optimum cutting performance is achieved when the hydraulic motor in the drum cutter matches the hydraulic output from the excavator’s pumps
MOTOR SIZES e.g. ER 250-2, ER 250-3, etc
By changing the cam ring in the hydraulic motor from an ER 250-2 to an ER 250-3 for example, the volume of oil per revolution of the hydraulic motor is increased. This increases the power required per revolution which translates into higher torque and higher productivity. In this way, the hydraulic motor in the drum cutter is matched to obtain the optimum performance from the pumps in the excavator.
Nothing can be gained by selecting a rock cutter fitted with a hydraulic motor that requires 190 l/min of oil to obtain maximum performance when the excavator can only supply 150 l/min!!!
The time required to convert a motor from one size to another is approx. 1 hour.
1 or 2 Pump Availability
The majority of excavators are fitted with two pumps. As an example, the 17 ton CASE CX 160 has 2 x 136.7 l/min pumps. The primary function of one pump is to drive the main functions of the excavator and the second provides oil for the attachments.
The ER 600 rock cutter is the ideal size for this excavator but the ER 600-1 motor requires 120 l/min and the ER 600-2 motor requires 150 l/min.
If the oil flow from only one pump is available then the -1 motor size is correct but if the pumps are connected so that they can both provide flow for the attachment, then the -2 motor can be used.
Operating limits in terms of rock hardness for drum cutters
Power is required to fracture material such as concrete or rock. As the compressive strength of the material increases, more power is required to fracture it. The power available from the drum cutter is limited by the hydraulic motor and the power available from the excavator. As drum cutters increase in size, they have larger hydraulic motors, take more power from the excavator and are capable of cutting harder rocks.
Please see the Compressive Strength Table for Common Rock Types in the box below to see the operating limits for each size of drum cutter. This table is intended as a guide and in some conditions, these limits can vary.
What production rate can I expect from a drum cutter?
The Productivity Table in the downloads below can be used as an indicator of the productivity rates that can be achieved within the operating range of rock hardness suitable for rotary drum cutters.
These levels can vary by as much as plus/minus 15% depending on:
- size of hydraulic motor
- cutting direction (wall, floor, trench, etc)
- operator experience
- ground conditions e.g. layers, fissures, weathering, etc
|Oil flow @
|Cutting Force @
|Cutting Force @
|ER 50||1 – 3||150||6.6 – 10.0||423 – 628||706 – 1047||1147 – 1700||1912 – 2835||220|
|ER 100||3 – 7||110||10.8 – 16.4||925 – 1378||1548 – 8615||1763 – 2625||2950 – 4376||485|
|ER 250||7 – 15||90 – 95||15.8 – 24.4||–||2581 – 3835||–||3934 – 5854||992|
|ER 600||10 – 20||80||31.7 – 39.6||–||6396 – 7670||–||9780 – 11670||1980|
|ER 650||10 – 20||80 – 85||37.0 – 50.2||–||23088 – 34120||–||7037 – 10400||2200|
|ER 1200||20 – 40||75||47.5 – 79.2||–||10000 – 17250||–||9400 – 16190||3500|
|ER 1500||20 – 40||75||47.5 – 79.2||–||10000 – 17250||–||9400 – 16190||3640 – 3860|
|ER 2000||30 – 50||65 – 75||79.2 – 103||–||16450 – 24700||–||14740 – 22150||4850|
|ER 3000||45 – 70||53 – 62||92.5 – 118.9||–||22990 – 34585||–||17410 – 26190||7275|
|ER 5500||70 – 125||48 – 52||185 – 250||–||54800 – 80500||–||36330 – 53330||13200|