Product Weight


Product Carrier Weight
21-32 t


Oil Flow Range
140-200 l/min

The 1,660 kg Rammer 2577 PRO is based on the field proven Rammer 2577 hammer and shares with it many key features that have established that unit as one of the most popular hammers in the world.

These standard Rammer 2577 features are backed by a range of enhancements that help the 2577 PRO withstand extreme working conditions. The unit benefits from a sealed housing structure that prevents the ingress of dust and dirt, thereby extending the working life of both the hammer and the tool. A top cover plate has sealed through apertures for stump hydraulic hoses and features sealed hose connections for grease, air and water. The hammer has a sturdy housing design and wear resistant wear plates that make it perfect for horizontal working duties in applications such as tunneling.


  • Membrane type accumulator
  • Twin-handed
  • Sound suppressed
  • FBE (Fixed blow energy)
  • Ramlube I (Optional)
  • Ramlube II (Optional)
  • VIDAT tie rods
  • Idle blow protector (Optional)
  • Soft blow sensor (Optional)
  • RamValve
  • PRO / Tunnel Housing


  • Primary Demolition
  • Boulder Breaking
  • Trenching
  • Secondary Demolition
  • Tunneling

Compatible with Standard Chisel Tool, Hard Rock Chisel Tool, Tunneling Hard Rock Tool, Limestone Chisel Tool, Tunneling Limestone Chisel Tool, Long Chisel Tol, Moil Point Tool, Pyramid Tool, Tunneling Moil Point Tool, Standard Blunt Tool, Long Blunt Tool, Super Blunt Tool, AGW Unit, Ramlube l, and Ramair. 

  Metric Imperial
Weight 1660 kg 3660 lb
Minimum working weight, flange mounted *1 1940 kg 4280 lb
Impact rate (frequency) 450-750 bpm  
Operating pressure 135-145 bar 1960-2105 psi
Presure relief min *2 190 bar 2755 psi
Pressure relief max 220 bar 3190 psi
Oil flow range 140-200 l/min 37.0-52.8 gal/min
Back pressure max 10 bar 145 psi
Input power 48 KW 64 hp
Tool diameter 135 mm 5.31 in
Pressure line connection (IN) ORFS ISO 8434-3 (1 11/1-12 UN)  
Return line connection (OUT) ORFS ISO 8434-3 (1 11/1-12 UN)  
Pressure line size *3 26 mm 1.02 in
Return line size *3 32 mm 1.26 in
Grease connection BSPP-internal 3/8 in  
Air connection (A) BSPP-internal 3/8 in  
Water connection BSPP-internal 1/2 in  
Optimum oil temperature 40-60°C 104-140 °F
Allowed oil temperature range -20-80°C -4-176°F
Optimum oil viscosity at operating temperature 30-60cSt  
Allowed viscosity range 20-1000cSt  
Carrier weight, optimum 23-28 t 50700-61700 lb
Carrier weight, range *4 21-32 t 46300-70500 lb
Noise level, guaranteed (2000/14/EC) 119 dB(A)  
Noise level, guaranteed (2000/14/EC) 123 dB(A)  

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