Description
Cracked floor tiles and stubborn mortar beds resist light rotary hammer chipping. The Makita 20 lb. Demolition Hammer Accepts SDS-MAX Bits chips away concrete footings and structural masonry without motor hesitation. Driven by a 14-amp industrial motor, this heavy-duty hammer yields 18.8 ft-lbs of impact energy. Operating without bit resistance damages the front barrel cushions, leading to mechanical piston seizure.
A precision-machined alloy 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. Hardened grease breakdown inside the piston chamber causes loss of impact force and piston seizure during cold weather.
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
- Twelve-position bit angle settings lock chisels at the optimum attack angle for floor and wall work
- 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
- Impact-resistant polymer motor housing protects internal drive components from flying concrete chunks
- 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 20 lb demolition hammer, one SDS-Max bull point chisel, a tube of hammer grease, a plastic carry case, and the instruction manual.
