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National 8274-4 Planetary Grinder Parts
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Manuals & parts diagrams
Specs & maintenance scheduleManuals & documents
Parts diagrams (402902 Rev D)
- Complete parts list p. 20
- Parts list and diagrams p. 21
- 18" Deck Assembly p. 22
- Parts not shown p. 23
Maintenance guides for this machine
How-to and troubleshooting from the PreFloor Knowledge Center.
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Dust Extraction: Matching a HEPA Vacuum to Your Grinder
Sizing a dust collector to a grinder under OSHA Table 1, what HEPA and filter cleaning mean in practice, and the setup mistakes that kill airflow.
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Grind, Shot Blast or Scarify? Choosing a Prep Method
Diamond grinding, shot blasting and scarifying compared: the surface profile each produces, what each removes, and how to pick one for the job.
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Diamond Tooling: Bond Hardness and Grit Selection
How to match diamond bond hardness to the slab, which grit does what, when to use PCD instead, and how to tell your tooling is wrong.
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Metal Bond, Resin Bond and PCD Tooling Compared
What metal bond, hybrid, resin bond and PCD tooling each do, where one hands off to the next, and why PCD is a removal tool only.
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Grinding Off Thinset, Mastic and Glue Residue
Getting thinset, mastic and glue residue off concrete: testing first, choosing between PCD, metal bonds and floor-machine attachments, and handling the dust.
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Polishing Concrete: Grit Sequence and Densifier
The grind-hone-polish sequence, when and how to apply densifier, lithium vs sodium silicate, gloss targets, and dust and slurry rules for polished concrete.
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