RIDGID HC-300 - Manual (Page 14)

12
HC-450/HC-300 Hole Cutting Tools
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 dam-
age 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
” / 1,3 cm.
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.)
3. Inspect the commutator for wear. If excessively
worn, have tool serviced.
4. Depress the brush into the holder and insert into
the motor housing. Inspect to make sure insula-
tor sheets are properly positioned between brush
holder and housing. Attach the connector and re-
place 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.)
Accessories
WARNING
To reduce the risk of serious injury, only use acces-
sories 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.
Figure 12 – Brush Placement ­ Motor Cover Removed
Connector
Brush
Insulator
Sheet
Catalog
No. Description
84427 HC-450 Carry Case
59502 R4 5 /
8
” / 16 mm Arbor only for Hole Saws
59132 Chuck Key
See RIDGID catalog for listing of Hole Saws.
Model HC-450
Catalog
No. Description
16671 R2S Solid Shank Arbor
84427 HC-450/HC-300 Carrying Case
77017 Chuck Key
Model HC-300
Figure 13 – Adjusting Gib Screws
Gib Screws