Description
Inconsistent site voltage from portable generators burns out switch contacts and cooks armatures on remote bridge jobs. The DEWALT 1-3/4 in SDS MAX Combination Rotary Hammer Kit maintains full impact stroke power under fluctuating line input. An 8.8-joule electro-pneumatic striker produces 2900 blows per minute. Jamming large carbide core barrels into structural rebar without feed downforce stalls the mechanical drive train.
Cast magnesium front housings protect surface-ground alloy steel gears bathed in synthetic fluid grease. The 15-ampere motor armature integrates epoxy-coated copper wire bundles that deflect airborne silica chips. Precision ball bearings support the output spindle against extreme axial hammering loads. An integral mechanical safety clutch slips the instant flute flutes bind in embedded rebar, preserving internal reduction gear teeth.
Combination Rotary Hammer Hardware Matrix
Mechanical slip clutches protect gearbox gear sets from shock load fracture during sudden rebar strikes. Active vibration suspension isolates technician arms from continuous mechanical impact recoil.
- 1.75-inch solid concrete bit capacity drills deep commercial pipe penetration sleeves
- 8.8-joule impact energy fractures hard stone aggregate with minimal technician downforce
- 15-ampere 120-volt motor delivers continuous rotary torque under heavy forward feed
- SHOCKS Active Vibration Control floating rear handle drops user fatigue during long shifts
- Electronic constant-speed electronics maintain drilling speed under heavy aggregate resistance
- Two-mode selector lever switches between hammer drilling and hammer-only surface demolition
- SDS-Max tool holder grips large core cutters and ground rod drivers securely
Electrical Load Bench Telemetry
Bench monitors log an unloaded current draw of 3.6 amperes at 120 volts, surging to 14.8 amperes while drilling with a 1-3/4-inch carbide bit in cured structural slab. Spindle rotation drops from 380 RPM free speed down to 315 RPM under high downforce. Striker frequency hits 2860 BPM under load. Sound meters read 95 dBA at technician ear level. Front gearcase temperature rises 27 degrees Fahrenheit after twelve holes.
Field Service Boundaries Upkeep Rules
Neglecting bit shank grease causes high-friction galling that seizes expensive SDS-Max bits inside the chuck. Cabinet installers driving small screws have zero use for this heavy-duty hammer. Never run the striker mechanism without applying forward downforce against the work surface.
- Coat cutter insertion shanks with high-pressure paste before tool engagement.
- Wipe abrasive grit from the chuck nose seal ring after concrete work.
- Check power cord insulation for scrapes or cuts before plugging into line current.
Commercial Warranty Package Inventory
DEWALT provides a 3-Year limited commercial warranty covering drive defects and factory assembly. The carton holds the 1-3/4-inch SDS-Max hammer, 360-degree auxiliary side handle, depth stop rod, and heavy-duty blow-molded storage case.
