8274-4
PLANETARY FLOOR PREPARATION SYSTEM
The 8274-4 is the only grinder on the market offering 3 HP at 115 volts while operating at a 230-volt level. With variable speed and a soft start to control its amperage draw, power adjusts to the needs of small or large jobs. The versatility of the 8274-4 is derived from its quick change magnetic tooling to remove thin-set, coatings, adhesives, and high spots, prepare concrete and overlays for coatings, and sand and refinish wood flooring. Polishes floors to a high-gloss shine.
Features
- Three-part adjustable angle handle
- Electronic control box minimizes tripped and blown breakers
- Forward and reverse directional controls increase tooling productivity with cleaner consumables and more even wear
- Variable speed control
- Dual rear vacuum ports
- Flip-style weights for added or decreased head pressure
- Removable handle and weights for easy transport
- 18-inch grinding path; uses National’s patented self-tensioning, single-belt design to prepare concrete surfaces to a 3000-resin shine
- Adjustable velcro dust guard lets the machine operate within 1/8 inch of walls and promotes nearly dustless operation
- Grinder head rotates 90 degrees for easy tooling change access; Morflex couplers, polishing undulating concrete surfaces or creating a uniform scratch pattern for coating applications; operates a complete dry grind and polish system to eliminate messy and hazardous slurry
- This new and improved grinder now features the increased reliability of an on/off switch on the handle
Specifications
| Standard | Metric | |
|---|---|---|
| Width | 20" | 51 cm |
| Disk Size | 18.5" | 47 cm |
| Max. Height | 52" | 132 cm |
| Min. Height | 27.5" | 70 cm |
| Max. Length | 75" | 191 cm |
| Min. Length | 38.5" | 98 cm |
| Weight | 388 lb | 176 kg |
| Drum RPM | 133.8 | |
| Motor RPM | 1740 | |
| Voltage | 115 | |
| Frequency | 60 Hz | |
| Motor Phase | Three* | |
| HP | 3 | 2.24 kW |
| Amps | 15 or 20-controller can switch between both settings |
Inclusions
- 401454: Morflex couplers
- 9241 Quick-change magnetic-mount tooling: Three assemblies and three 73250 tooling holder mounting screens are required
- 9245 Velcro plate adapter: Mounts onto the 9241 quick-change magnetic assembly for using polishing pads and brazed disks. Three adapters are required.
- 6280-401B: 7/32 T-handle wrench
- 6254: 50-foot, 12-gauge extension cord
- Instruction manual
Recommended Accessories
National recommends adding these accessories to your order, so you can stay in the work longer.
9507-16: 16 Grit Half Bar Metal Bond Diamond Insert (6 min. suggested)
9507-30: 30 Grit Half Bar Metal BondDiamond Insert (6 min. suggested)
9521: Carbide Tooling Holder (6 min. suggested)
9554: 1Up PCD- 1/2 Round (6 min. suggested)
- manual:
- Manual
