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Maintenance Instructions
WARNING
Make sure that the ON/OFF switch is in the OFF po-
sition and the tool is unplugged before performing
any maintenance or making any adjustments.
Maintain tool according to these procedures to re-
duce the risk of injury from electrical shock, entan-
glement and other causes.
Cleaning
After each use, wipe any chips or oil off with a soft,
clean, damp cloth, especially areas of relative motion
such as the posts. Clean any dust and debris from the
motor vents.
Lubrication
The Hole Cutting Tools gearboxes are designed as
sealed systems, and should not require any additional
grease unless significant leakage has occurred. In those
cases, the tools should be returned to a service center.
Do not lubricate the bearings that ride on the posts.
The bearings are not designed to be used with lubricants,
and lubricants will hold dirt and debris that could damage
the bearings.
As needed, the chain and screw assemblies can be lu-
bricated with a light lubricating oil. Wipe any excess oil
from exposed surfaces.
Changing Brushes
Check motor brushes every six months and replace
when worn to less than
1
/
2
1. Remove four screws holding motor cover, remove
cover.
2. Using a pair of pliers, pull the motor brushes straight
out. Detach the connector. (See Figure 12)
Connector
Brush
Figure 12 – Brush Placement - Motor Cover Removed
3. Inspect the commutator for wear. If excessively worn,
have tool serviced.
999-998-050.10_REV. C
".
Insulator
Sheet
HC-450/HC-300 Hole Cutting Tools
4. Depress the brush into the holder and insert into the
motor housing. Inspect to make sure insulator sheets
are properly positioned between brush holder and
housing. Attach the connector and replace the motor
cover.
Gib Screw Adjustment
Gib screws are provided on the HC-450 to allow ad-
justment of the drag between the base and motor as-
semblies. Tighten or loosen the Gib screws to adjust as
desired. (See Figure 13)
Figure 13 – Adjusting Gib Screws
Accessories
WARNING
To reduce the risk of serious injury, only use ac-
cessories specifically designed and recommended
for use with the RIDGID Hole Cutting Tools, such as
those listed below. Other Accessories suitable for
use with other tools may be hazardous when used
with the RIDGID Hole Cutting Tools.
Model HC-300
Catalog
No.
Description
16671
R2S Solid Shank Arbor
84427
HC-450/HC-300 Carrying Case
77017
Chuck Key
Model HC-450
Catalog
No.
Description
84427
HC-450 Carry Case
59502
R4 5⁄8" Arbor only for Hole Saws
59132
Chuck Key
See RIDGID catalog for listing of Hole Saws.
Gib Screws
11
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