Charnwood 305DB User manual

305DB Mitre Saw
Inspection and Replacement of Carbon Brushes
The life of the brushes is variable. It depends on the workload of the motor. Check them after
50 hours of use if the tool is new or new brushes have been installed. After the first check,
inspect the brushes every 10 hours until they are replaced.
The brush holders are located inside the motor housing. Replace both brushes if the black
carbon block is worn to less than 5mm in length, or if a feed wire is burnt or damaged. If the
brushes are in good condition put them back in the same position they were removed from.
A new carbon brush is around 19mm in length.
Ensure the Machine is disconnected
from the power supply.
Use a screwdriver to remove the two
retaining screws from the end cover of
the motor.
Remove the cover.
There are 2 brushes on the motor.

Pull the spade terminal to disconnect
the brush power supply lead.
Use the shaft of a small screwdriver to
lift the end of the coil spring which
holds the brush in place.
Remove the brush, inspect it and
replace if necessary.
(If the brush does not require
replacement, refit the brush in the
same position it came from)
A new carbon brush is around 19mm in
length. They are available from
Charnwood as a pair.
After replacing the brush,
ensure that the retaining spring is
correctly positioned applying pressure
to the end of the brush.
Ensure that the braided wire is not
trapped and the spade terminal is fully
connected making a good contact.
Replace the motor cover and run the
motor for a minute if new brushes have
been fitted. It is normal for the motor to
spark slightly as they are bedding in.
Charnwood, Cedar Court, Walker Road,
Hilltop Industrial Estate, Bardon Hill, Leicestershire, LE67 1TU
Tel. [phone] Fax. [phone]
email: [e-mail] website: www.charnwood.net