Product Weight


Product Carrier Weight


Oil Flow Range
40-120 l/min

Scaling is removal of loose material from the tunnel roof and walls to prevent accidents by falling rocks.

Rammer has always been at the forefront of hammer development, and the 777 scaler is just a part of the next phase in hammer development for special applications, such as scaling.

Scaling is an extremely tough job for the hammer, and only a specialized scaling hammer should be used.



  • Single lower tool bushing
  • Membrane type accumulator
  • Twin-handed
  • Sound suppressed
  • No tie rods
  • CBE+ (Constant blow energy plus)
  • Air pipeing
  • Water jet pipeing
  • Lowered operating pressure
  • Grease pipeing


  • Scaling

Compatible with Standard Chisel Tool, Moil Point Tool, Asphalt Cutting Parallel Tool, Asphalt Cutting Traverse Tool, Compacting Tool, and Special Tool Grease 

  Metric Imperial
Weight 315 kg 690 lb
Working length 1449 mm 57.0 in
Minimum working weight, pin mounted *1 385 kg 850 lb
Impact rate (frequency) 500-1700 bpm  
Operating pressure 80-130 bar 1160-1885 psi
Pressure relief min *2 130-180 bar 1160-1885 psi
Pressure relief max 220 bar 3190 psi
Pressure in LP-circuit 30-32 bar 435-465 psi
Oil flow range 40-120 l/min 10.6-31.7 gal/min
Back pressure max 20 bar 290psi
Input power 26 KW 35 hp
Tool diameter 80 mm 3.15 in
Pressure line connection (IN) BSPP-internal 3/4 in  
Return line connection (OUT) BSPP-internal 3/4 in  
Pressure line size *3 19 mm 0.75 in
Return line size *3 19 mm 0.75 in
Grease connection UNF 11/16-16-external  
Air connection (A) UNF 11/16-16-external  
Water connection UNF 11/16-16-external  
Optimum oil temperature 40-60°C 104-140°F
Allowed oil temperature -20-80°C -4-176°F
Optimum oil viscosity at operating temperature 30-60cSt  
Allowed viscosity range 20-1000cSt  
Miniexcavator, tractor backhoe weight, optimum 4.9-7.8 t 10800-17200 lb
Miniexcavator, tractor backhoe weight, Optium 4.3-9.5 t 9500-20900 lb
Skid steer, robot weight, optimum 3.3-5.2 t 7300-11500 lb
Skid steer, robot weight, range *4 2.6-6.3 t 5700-13900 lb
Noise level, measured (2000/14/EC) 120dB(A)  
Noise level, guaranteed 124 dB(A)  

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