Description
Harsh chassis recoil on continuous slab demolition numbs worker forearms and causes early fatigue. The Makita 27 lbs. 14 AMP SDS-MAX Demolition Hammer combines heavy foundation-breaking impact with an internal counterbalance recoil absorption system. Driven by a 14-amp motor, this heavy-duty hammer yields 18.8 ft-lbs of impact energy. Pulling the trigger with the chisel unsupported allows destructive internal piston impacts against the front barrel stops.
An internal mechanical counterbalance mechanism moves opposite the drive piston to cancel out continuous harmonic recoil. The precision-machined steel barrel encloses an air-cushion piston striker engineered for maximum kinetic energy transfer into the SDS-Max tool shank. The drive gear housing utilizes cast aluminum with an integrated heat sink design to shed internal operating heat. Sealed armature bearings keep abrasive masonry dust out of motor windings. Grease breakdown inside the counterbalance chamber causes loud chassis rattling and increased vibration transfer.
Concrete Demolition Mechanical Array
Concrete chipping crews require continuous linear impact without tool rotation to bust mortar beds and floor tiles. The internal mechanical layout pairs high-velocity piston drive with simple bit retention.
- 14-amp electric motor delivers reliable kinetic impact power under continuous concrete demolition loads
- SDS-Max tool holder accepts heavy demolition bull points, cold chisels, and bushing tools firmly
- Anti-Vibration Technology utilizes an internal counterweight to cut vibration transfer to operator joints
- Constant speed electronics maintain impact velocity under heavy downward mechanical chisel loads
- Service reminder light indicates carbon brush wear approximately eight hours before tool shut-off
- Twelve-position bit angle settings lock chisels at the optimum attack angle for floor and wall work
- Ergonomic rubberized grip handle dampens continuous vibration transfer into the operator hand axis
Kinetic Piston Telemetry Load Analysis
Electrical draw stabilizes at 14 amps under continuous concrete breaking at maximum load. Impact frequency cycles from 950 to 1,900 blows per minute driven by the air-cushioned piston assembly. Mechanical kinetic energy outputs 18.8 ft-lbs per blow into structural concrete slabs. Continuous internal air compression raises gear casing surface temperatures to 140°F during extended demolition runs. The SDS-Max drive spline withstands up to 65 ft-lbs of off-axis pry torque. Sound pressure measures 95 dBA at operator ear level.
Masonry Demolition Field Care Directives
Heavy chipping hammers require regular bit shank lubrication to preserve internal retainer splines. Plumbers drilling round holes in foundation walls must not purchase this tool because it lacks a rotary drilling mode. Prying heavy slabs with the chisel shank while running the hammer will snap the tool bit inside the SDS-Max chuck.
- Coat the shank of every SDS-Max chisel with high-temperature hammer grease before chuck insertion
- Blow concrete dust out of the rear motor ventilation slots using dry compressed air weekly
- Inspect the SDS-Max chuck retainer sleeve for axial play to prevent loose bit retention failures
Commercial Warranty Terms Kit Inventory
Makita backs this demolition hammer with a 1-Year limited commercial warranty covering manufacturing and material defects. The complete packaged kit contains the 27 lb demolition hammer, an SDS-Max bull point chisel, a flat chisel, hammer grease, a heavy-duty transport case, and the instruction manual.
