Maintenance; Troubleshooting Guide - KNOVA KN M-2502N Manual

MAINTENANCE

mAINTENANCE
DANGER
Never put lubricants on the blade while it
is spinning.
WARNING
• To avoid fire or toxic reaction, never
use gasoline, naphtha acetone, lacquer thinner or
similar highly volatile solvents to clean the miter saw.
• To avoid injury from unexpected starting or electrical
shock, unplug the power cord before working on the saw.
• For your safety, this saw is double insulated. To avoid
electrical shock, fire or injury, use only parts identical to
those identified in the parts list. Reassemble exactly as the
original assembly to avoid electrical shock.
REPLACING CARBON BRUSHES (FIG. SS)
Replace both carbon brushes when either has less than 1/4
in. length of carbon remaining, or if the spring or wire is dam-
aged or burned. To inspect or replace brushes, first unplug
the saw. Remove the black plastic cap (1) on the side of the
motor (2). Use caution when removing the cap because it is
springloaded. Pull out the brush and replace. Replace for the
other side. To reassemble, reverse the procedure. Press the
metal part of the carbon brush in the hole where the carbon
part fits. Tighten the cap
snugly but do not
overtighten.
NOTE: When reinstalling
the same brushes, put
them back in the way
they came out. This will
avoid a break-in period
that reduces motor
performance and
Fig. SS
increases wear.

TROUBLESHOOTING GUIDE

WARNING
To avoid injury from accidental starting, always turn switch OFF and unplug the tool before
moving, replacing the blade or making adjustments.
TROUBLESHOOTING GUIDE - MOTOR
PR OBL EM PR OBL E M C AU S E
Brake does 1. Motor brushes not sealed or lightly sticking.
not stop
2. Motor brake overheated from use of defective
blade within
or wrong size blade or rapid ON/OFF cycling.
6 seconds.
3. Arbor bolt loose.
4. Brushes cracked, damaged, etc.
5. Other.
motor does 1. Limit switch failure
not start.
2. Brush worn.
3. Fuse blown or circuit breaker tripped
on home panel.
4. Other.
LOWER BLADE GUARD
do not use the saw without the lower blade guard. The lower
blade guard is attached to the saw for your protection. Should
the lower guard become damaged, do not use the saw un-
til the damaged guard has been replaced. Check regularly
to make sure the lower guard is working properly. Clean the
lower guard of any dust or buildup with a damp cloth.
CAUTIO
could make the plastic "cloudy" and brittle.
• When cleaning the lower guard, unplug the saw from the
power source receptacle to avoid unexpected start-up.
WARNING
eye protection to keep debris from blowing into eyes.
LUBRICATION (FIG.
All the motor bearings in this tool are lubricated with a suf-
ficient amount of high-grade lubricant for the life of the unit
under normal operating conditions; therefore, no further lubri-
cation is required.
Lubricate the following as necessary:
Chop pivot: Apply light machine oil to points indicated in
illustration.
2
Central pivot of
plastic guard: Use
light household oil
(sewing machine
oil) on metal-tometal
or metal-to-plastic
guard contact areas
as required for
smooth, quiet
operation. Avoid
1
excessive oil, to
which sawdust
will cling.
Fig. TT
SU GG ESTED C ORR ECTIVE ACT IO N
1. Inspect/clean/replace brushes.
See MAINTENANCE section.
2. Use a recommended blade. Let cool down. See
REMOVING OR INSTALLING THE BLADE section.
3. Retighten. See REMOVING OR INSTALLING
THE BLADE section.
4. Replace brushes.
5. Contact Knova Service Centre.
1. Replace limit switch.
2. Replace brushes. See MAINTENANCE section.
3. Verify there is electrical power at the outlet.
4. Contact Knova Service Centre.
21
• Do not use solvents on the guard. They
When removing wood sawdust, wear proper
TT)ION (FIG. TT)
Central pivot of
plastic guard
Add oil here and on opposite side