Series: Performance Hammers | Energy: 4,745 J (3,500 ft-lbf) | Carrier: 16–27 t (35,300–59,500 lb)
The CAT H120 S is a hydraulic hammer built for contractors, rental fleets, demolition crews, quarry operators, and equipment owners who need a breaker that fits their carrier correctly and delivers reliable output in the field. This model sits in the Performance Hammers range and is well suited for commercial demolition, secondary breaking, road construction, oversize reduction, and heavy trench excavation. When a breaker is matched correctly to the carrier — by weight class, hydraulic flow, and operating pressure — operators get better production, less unnecessary vibration transmitted back to the machine, reduced wear on the attachment and bracket, and fewer problems with hoses, bushings, retainers, and seals.
The CAT H120 S is designed for 16–27 t (35,300–59,500 lb), with a service weight of 1,480 kg (3,256 lb). The tool steel diameter is 120 mm (4.7 in), oil flow requirements are 100–170 L/min (26–45 gpm), operating pressure is 13,000–15,000 kPa (1,885–2,175 psi), and the impact rate is 350–620 BPM. The energy class is 4,745 J (3,500 ft-lbf). These specifications define where this breaker fits in the lineup. A unit that is too small for the job will force the operator to work the tool harder than intended, causing overheating and premature wear. A unit that is too large for the carrier can create excess hydraulic heat, damage mounting hardware, and shorten the service life of both the hammer and the machine.
Maintenance discipline is as important as correct sizing. A hydraulic hammer operates in some of the most demanding conditions on a jobsite — dust, shock load, side load, heat, moisture, and thousands of impact cycles per hour. Even a well-built breaker will lose performance if the lower bushing wears undetected, the tool is run dry, the seals harden from heat cycling, nitrogen or accumulator pressure drifts out of specification, or hydraulic flow and pressure fall outside the recommended range. Owners should inspect the tool steel, retainers, bushings, tie rods, hoses, fittings, and the grease system on a regular schedule. A properly maintained hammer hits harder, runs cooler, and protects the carrier better than a neglected one. For many contractors, the real value of this model is not the purchase price alone — it is the ability to keep it running through repairable wear rather than replacing the whole breaker.
The design characteristics of the CAT H120 S include Cat-style serviceability, carrier protection, practical hydraulic requirements, and a durable housing built for rental and construction fleets. These attributes make it well suited for applications where productivity, controllability, carrier protection, and access to service support all matter. When comparing this model against similar breakers, pay close attention to carrier size match, hydraulic circuit setup, tool steel availability, and the parts support network available in your area. Matching the hammer correctly to the carrier improves efficiency and helps prevent common issues such as weak hitting, slow cycling, tool overheating, premature bushing wear, and cracked mounting hardware.
HBS provides complete support for the CAT H120 S, including hydraulic hammer repairs, full rebuilds, routine maintenance, and sales. Parts stocked and available for this model include chisels (120 mm (4.7 in) tool steel diameter), tie rods, upper and lower bushings, retainer pins, accumulator diaphragms or membranes, hydraulic seals and seal kits, front head components, and hoses and fittings. Whether this breaker is leaking oil, hitting weak, cycling slowly, overheating, wearing tools too fast, breaking retainers, or due for a full overhaul, HBS can diagnose the issue and return it to working condition. Contact HBS for service pricing, parts availability, rebuild options, and expert guidance on matching this hammer to the right carrier and application.
Key Features
- Impact energy of 4,745 J (3,500 ft-lbf) at 350–620 BPM positions the CAT H120 S for heavy demolition and secondary breaking work where sustained output and carrier protection must operate together
- Cat Performance Hammers series delivers Cat’s highest energy-to-weight specification in this carrier class, with auto-stroke selection, carrier protection circuitry, and Cat-standard serviceability designed for sustained production use on demolition and quarry fleets
- Full-coverage silenced housing on the Performance S variant provides noise reduction suitable for blast-restricted zones and urban sites with construction noise ordinances, while also protecting internal components from dust, water, and physical damage
- HBS stocks parts for the CAT H120 S including chisels (120 mm (4.7 in) tool steel), tie rods, upper and lower bushings, retainer pins, accumulator components, hydraulic seal kits, front head parts, and hoses — supporting repairs, rebuilds, and preventive maintenance without extended wait times
Key Specifications & Service Points
- Recommended carrier match: 16–27 t (35,300–59,500 lb) — service weight 1,480 kg (3,256 lb)
- Core performance: energy class 4,745 J (3,500 ft-lbf); impact rate 350–620 BPM
- Hydraulic requirements: oil flow 100–170 L/min (26–45 gpm); operating pressure 13,000–15,000 kPa (1,885–2,175 psi)
- Parts available from HBS: chisels (120 mm (4.7 in) tool steel), tie rods, upper and lower bushings, retainer pins, accumulator components, hydraulic seal kits, front head parts, and hoses
