The use of advanced hydraulics, materials technology, strength calculations, impact wave theory and production technology has enabled Rammer to create hydraulic hammers that are powerful, durable, cost-effective and the undisputed leaders in their class.

Rammer 4099 Rockbreaker has been designed using a revolutionary new operating principle that combines stroke length, blow energy and Rammer’s idle blow protector, allowing the rockbreaker to be adjusted to match individual carriers and applications, improving hydraulic efficiency and safety.


  • Membrane type accumulator
  • twin-handed
  • Sound supressed
  • FBE (Fixed blow energy)
  • Lifetime warranty
  • Ramlube I (Optional)
  • Ramlube II (Optional)
  • VIDAT tie rods
  • Heavy duty housing (Optional)
  • Idle blow protector (Optional)
  • Stroke Selector


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


Weight 2800 kg 6170 lb
Working length 2962 mm 116.6 in
Minimum working weight, flange mounted  *1 3380 kg 7450 lb
Impact rate, Long stroke 400 - 560 bpm
Impact rate, Short stroke 520 - 700 bpm
Operating pressure 150 - 160 bar 2175 - 2320 psi
Pressure relief min  *2 210 bar 3045 psi
Pressure relief max 230 bar 3335 psi
Oil flow range 250 - 350 l/min 66.0 - 92.5 gal/min
Back pressure max 12 bar 175 psi
Input power 93 kW 125 hp
Tool diameter 166 mm 6.54 in
Pressure line connection (IN) SAE 6000 psi 1 1/4"
Return line connection (OUT) SAE 6000 psi 1 1/4"
Pressure line size  *3 32 mm 1.26 in
Return line size  *3 32 mm 1.26 in
Grease connection BSPP-internal 3/8"
Air connection (A) BSPP-internal 3/8"
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 - 60 cSt
Allowed viscosity range 20 - 1000 cSt
Carrier weight, optimum  *4 37 - 50 t 81600 - 110200 lb
Carrier weight, range  *4 34 - 55 t 75000 - 121300 lb
Noise level, measured (2000/14/EC) 126 dB(A)
Noise level, guaranteed (2000/14/EC) 130 dB(A)
*1   Includes average mounting bracket and standard tool
*2   Minimun setting = actual operating pressure + 50 bar or 725 psi
*3   minimum inner diameter
*4   Check carrier allowed attachment weight from carrier manufacturer. Check application requirements.


More Information

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