Wen 3939, Instruction Manual, Page: 14 / 24

ASSEMBLY & ADJUSTMENTS
2. Use a hex wrench to loosen the lower socket-head cap screw
(Fig. 13 – 2). Position the thrust bearing so that it is as close to
the spine of the blade as possible, without touching it.
3. Rotate the blade a few times to ensure that the spine of the
blade does not touch the bearing at all while the blade is rotating.
Once the bearing has been properly positioned, tighten the screw.
4. Use a hex wrench to loosen the socket-head cap screws on the
front of the assembly (Fig. 13 – 1 & 2). Position the roller bear-
ings, left and right, so that they are as close as possible to the
body of the blade without touching it. This will be about 0.5mm
(1/50 inch).
WARNING! Disconnect machine from the power source! Never make adjustments with the machine run-
ning. Failure to comply may cause serious injury.
1. Open the lower cover. Be careful to not touch the blade.
2. Loosen the socket-head cap screw on the back of the motor-mounting flange, then move the motor towards the
center of the saw to lower tension on the belt. Move the motor towards the outside of the saw to increase tension
on the belt.
3. Tighten the screw once the desired belt tension has been achieved. The belt is properly tensioned when firm
downward pressure on the belt, applied with a finger on the bottom of the belt between the pulleys (may need line
art), moves the belt no more than 1/8” (3mm).
Fig. 13
2
1
5. Rotate the blade a few times to ensure that the body of the blade does not touch either roller bearing at all while
the blade is rotating. Once the bearings have been properly positioned, tighten the screws.
ADJUSTING THE BELT TENSION
Use the instructions below to adjust the belt tension, as needed, over the life of your saw. Older belts may stretch
with use. If you do not plan to use the saw for longer than 1 week, release the tension on the drive belt in order to
prolong its life.
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