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SKU 91223 Page 12
MAINTENANCE
WARNING:
DO NOT DISASSEMBLE.
This tool should be serviced by a qualified technician only. Incorrect reassembly can result in
electric shock, fire, or further damage to the tool.
Always keep the grinder clean
Dust and grit containing particles from metal grinding often accumulate on interior surfaces and
could create an electrical shock hazard if not frequently cleaned out. On a regular basis, blow
dust and grit out of the motor housing using compressed air. Never blow compressed air at
greater than 10 PSI. Always wear goggles and dust mask when using compressed air.
CAUTION:
Never use solvents or other harsh chemicals for cleaning the non-metallic parts of the tool. Use a
clean, dry rag only.
Carbon Brush
Replace the carbon brush when it wears down to about 3/16” (5 mm) or sparking will occur.
To change the CARBON BRUSH (#22) do the following:
Step 1: Using a flat tip screw driver, unscrew the BRUSH CAP (# 23) on the HOUSING (# 18).
Figure 6 — Replacing the Carbon Brushes
Step 2: Replace the CARBON BRUSH with identical replacement parts from Harbor Freight
Tools.
Step 3: Replace the BRUSH CAP on the HOUSING and screw-in to tighten.
Housing
(#18)
Brush Cap
(#23)
Carbon Brush
(#23)
(#22)