The GP700 is National's 27" counter-rotational grinder and polisher, powered by a 7.5 HP three-phase electric motor. National rated it for mastic, thin-set and coating removal and for concrete polishing.
National no longer lists the GP700 on its website. The manual below is the latest revision National published.
Specifications
Specs from National's GP700 product page and maintenance checklist. The spec table printed in the GP700 manual (403309 Rev D) repeats the GP3000's size and weight, so it is not used here.
| Spec | Value |
|---|---|
| Cleaning path | 27" (68.6 cm) |
| Dimensions | 27.25" W x 56.5" L x 37.5" H (68.6 x 143 x 95 cm) |
| Weight | 800 lb (363 kg) |
| Grinding pressure with weights | 440 lb (200 kg) |
| Tooling RPM | 390-585 |
| Motor | 7.5 HP (5.6 kW), three phase, 230/415 V, 60/50 Hz |
| Amps | 11 A draw; 30 A circuit |
| Water tank | 7 gallon, with trickle handle |
| Production rates | Mastic 350 sq ft/hr; thin-set 400; mil coatings 200; concrete polishing 450 |
Maintenance schedule
From National's GP700 operating manual (403309 Rev D) and the GP700 maintenance checklist.
| Interval | What to do |
|---|---|
| Daily (after each day's grinding) | Clean the machine; do not let grinding paste cake up |
| Weekly | Check coupling bolts for tightness |
| Every six months | Grease wheels, 1 shot each; bearing cap fittings (2), 3 shots; foot leveling device fitting, 1/2 shot; handle pivot shoulder bolts (4), 1/2 shot |
| Once a year | Check gear case grease level (should reach half the thickness of the helical gears) |
| Checklist (no interval given) | Empty and clean the water tank; check pitch lock, E-stop key and lanyard, caster, the four weights, control box (soft start, FWD/REV, variable speed), shroud and base seal brushes, Morflex couplers, hoses, frame for cracks and water trickle |
Fluids and lubricants
Lubricants named in the GP700 manual and checklist.
- Gear case: holds 6-1/4 lb of grease
- Handle Zerk fittings: white lithium grease, if required
Videos from National
National's GP700 video.
Sources
Everything on this page comes from National Flooring Equipment's own published material.
