8
OPERATING INSTRUCTIONS
Experience is very important when running the
390
electric
saw. A skilled worker is highly recommended. Read all instruc-
tions before using the saw. Always do an inspection of the saw
before using it. Check that all controls are in good working
order. Check for loose bolts or nuts. Check the cord for dam-
age. Insure all guards are secure, undamaged, and properly
installed.
WARNING
Do not leave the saw unattended while the engine
is running! Always secure the saw from movement
while unattended.
Plug in the extension cord to the proper electrical source.
Check that the cord is not tangled or caught on anything. Use
a minimum generator size of 2800 watts with a 20 amp circuit
breaker for 110 volts.
WARNING
Do not operate the saw unless all guards, safety
equipment and the motor ON/OFF switch are in place
and operational!
ON-OFF switch
Handle
Front guide wheel
Repair or replace any damaged components. Check for proper
specification of blade and that the skidplate is installed prop
-
erly. Check that the blade and skid plate are in good condition.
Make sure the work site is clean and, will lit and hazard free.
WARNING
Before each use, carefully inspect the
390
for any
damage to any of its parts and components. Under
no circumstance should the
390
or any of its attach-
ments be operated if you find damage or are suspi
-
cious that something appears to be damaged.
To begin sawing, line up the saw with the cut line using the
white wheel on the front guide (A) and the small notch on the
back of the base plate. Turn the safety switch (B) to the “ON”
(green) position. To turn the motor on, rotate the handle clock-
wise while keeping the saw aligned with the cut. Rotating the
handle fully to the right will turn the motor on. Hold tightly as
the saw will move back toward you slightly when starting to
cut.
Increase the forward speed of the saw until the depth gauge
(F) starts to show red. All red is too fast.
Do not force the saw
or stall the motor
. At the left side of the rear corner of the saw
is the aggregate adjuster knob (H). This adjustment knob will
change the down pressure on the cutting blade in relationship
to the hardness of the aggregate in your area.
Simply turn the knob accordingly to the soft, medium or hard
setting. By using the proper aggregate setting in conjunc-
tion with the the depth gauge, you will obtain optimum cutting
speeds. If in doubt, contact your ready mix supplier to help
determine the aggregate hardness.
Do not add additional
weights to the saw
.
Install the handles depending on the length needed. For best
results, use both handles or six (6) feet of length. Attach the
extension cord to the handle with the cord clamps. This will
keep the cord away from the saw. Make sure the safety switch
(B) in the handle is in the “OFF” (red) position. Extend the front
guide mechanism (with the front wheel) and latch into place by
sliding it forward on the hooked latch (E) on top of the blade
guard.
Push down on the handle until about knee high and roll the
saw off the concrete on the two rear wheel. Flip the safety
switch to the “OFF” (red) position to avoid false starting.
Hold pressure to the right to keep the motor running. Push the
saw forward with even pressure to cut keeping the front guide
wheel on the cut line. Push the saw at about half speed for the
first 20 feet to allow the blade to develop good diamond expo
-
sure or open up and promote full blade life.
When approaching a wall or obstruction, touch the guide wheel
and against the wall and then back up to release the guide.
The guide will rise out of the way to finish the cut. When the
cut is complete, turn the handle quickly counter-clockwise until
the it stops. The motor will stop, the blade will raise and pres-
sure will be applied to the rear back up wheel.
Periodically, clean any excess concrete from inside the blade
guard. The saw will leave two trails of concrete cuttings. Lightly
sweep the cutting parallel to the cut with the soft bristle broom.
Do not walk on the joints or transport equipment across
the joints until the concrete fully hardens
.