Jet Tools J-7040 - Manual (Page 16)

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12.5 Replacing drive motor
1. Disconnect the motor from all electrical power.
Unplug the motor if it is plugged into a socket.
Shut off the power to the branch and remove
the connection to the junction box if the motor
is hard wired to the branch.
2. Remove the drive belt from the drive motor
pulley (see sect. 12.4, Changing drive belt).
3. Remove motor pulley.
4. Open the motor junction box and disconnect
the power cord wires from their terminals.
5. Remove the nuts, washers and bolts that
secure the motor to the mounting plate.
6. 6. Installation of a new motor is a reversal of
the above steps.
12.6 Adjusting counterbalance
spring
1. The counterbalance spring is located at the
right, rear of the saw head. The
counterbalance spring is used to adjust the
amount of down force the saw head puts on
the workpiece when the feed rate control valve
is fully open.
2. Raise the saw arm to its full upright position
and lock it in position.
3. To adjust the tension on the spring, loosen the
two nuts on the threaded rod of the spring
pivot post. Adjust the tension as required.
4. Tighten the two nuts against the pivot post.
5. The saw can now be returned to service.
12.7 Replacing drive wheel
1. Remove the blade (see sect. 12.3, Changing
blades).
2. Remove the screw, spring washer, and washer
from the speed reducer shaft.
3. Pull the wheel from the speed reducer shaft.
Remove the drive key from the speed reducer
shaft.
4. Inspection: Examine drive edge and shoulder
of the wheel for damage. Replace the wheel if
damaged.
5. Install the key in the keyway in the speed
reducer shaft. Align the keyway in the wheel
with the key in the speed reducer shaft.
Reinstall the wheel on the speed reducer
shaft.
6. Install the screw, spring washer and washer in
the end of the speed reducer shaft.
7. Install the blade (see sect. 12.3, Changing
blades).
12.8 Replacing idler wheel or idler
bearing
1. Remove the saw blade (see sect. 12.3,
Changing blades).
2. Remove the screw, spring washer, and washer
from the idler shaft.
3. Remove the idler wheel. Remove the bearing
from the idler wheel.
4. Inspection: Examine the drive edge and
shoulder of the idler wheel for damage.
Replace the wheel if damaged.
5. Inspect bearings for damage and smooth
operation. Replace if faulty.
6. Install the bearing in the idler wheel. Install the
idler wheel on the idler shaft.
7. Install the screw, spring washer and washer in
the idler shaft.
8. Install the blade (sect. 12.3, Changing blades).
12.9 Adjusting blade guides
The cut-off saw has adjustable blade guide
supports (see Figure 16). The blade guide
supports allow you to set the blade guides for
varying widths of workpieces.
To make accurate cuts and prolong blade life, the
blade guide supports should be set to just clear the
workpiece to be cut.
Figure 16: Blade guide supports
1. Loosen the knob on the blade guide support
and slide the guide left or right as required.
Repeat for the other blade guide.
2. Set the blade guide supports as required to
accommodate the width/diameter of the
workpiece. The blade guides should be
positioned so the guides do not contact the
workpiece as the saw head moves downward
through the workpiece.