Jet Tools J-7040 - Manual (Page 15)

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3. Clean up accumulated saw cuttings after use.
Make sure the lead screw is kept free of saw
cuttings and other material that would cause
damage.
4. Clean the chip sludge from the coolant tank.
The frequency should be determined by how
often the saw is used.
12.2 Lubrication
Lubricate the following components at the specified
frequencies and using the lubricants as defined:
1. Ball bearings: the bearings are lubricated and
sealed—periodic lubrication is not required.
2. Blade guide bearing: The bearings are
lubricated and sealed—lubrication is not
required. Inspect periodically.
3. Idler wheel bushing: The bearings are
lubricated and sealed—lubrication is not
required. Inspect periodically.
4. Lead screw bearing housing: Lubricate with
light oil monthly (see exploded figure, section
14.1.1).
5. Lead screw: Lubricate with light oil monthly
(see exploded figure, section 14.1.1).
6. Hydraulic cylinder pivot: Lubricate with light oil
every 6 months (see exploded figure, section
14.1.1).
7. Blade tension screw: Lubricate with grease
every 6 months (see exploded figure, section
14.2.1).
8. Blade brush bearing: Lubricate with light oil
monthly (see exploded figure, section 14.2.1).
9. Gear box: check oil once a year.
10. Change coolant on a frequency appropriate to
the type of coolant being used. Oil based
coolants can sour. Refer to the coolant
supplier’s instructions for change frequency.
11. Coolant tank: Clean every 6 months or as
required.
12.3 Changing blades
Shut off all electrical power to
machine.
1. Loosen four knobs securing the blade cover.
Lift the cover and swing it backward.
2. Remove the blade guard mounted to the left
blade guide support.
Always wear leather gloves
when handling saw blade to avoid injury from
saw teeth.
1. Turn the blade tensioning hand wheel
clockwise to relieve tension on the blade.
Loosen the blade enough to remove the blade
from the idler and drive wheels. Remove the
blade from between the blade guides.
2. Install the new blade between the blade guide
bearings and the carbide blade guides. Install
the blade over the drive and idler wheels.
3. Turn the blade tensioning hand wheel
counterclockwise to tighten the blade. Tighten
the blade until the blade tension indicator
reads 2000 pounds.
4. Operate the saw at low speed and observe the
tracking of the blade. If tracking needs to be
adjusted, refer to sect. 11.1, Blade tracking
adjustment.
5. Adjust the bearings on the upper edge of the
blade until they just contact the blade (see
Figure 18).
6. Check the guide bearings and the carbide
guides to make sure they are just contacting
the sides of the blade.
7. Install the left blade guard making sure there is
ample clearance with the blade.
8. Make a test cut to make sure the blade tracks
properly during operation. Adjust tracking as
required (see sect. 11.1, Blade tracking
adjustment).
12.4 Changing drive belt
1. Disconnect the electrical power source from
the cut-off saw to prevent any possibility of
accidental motor start-up.
2. Set the arm at the full horizontal position.
3. Remove the knob on the drive belt cover.
Remove the drive belt cover to expose the V-
belt and pulleys.
4. Remove two screws, nuts, and washers from
back of saw head support. Push on the motor
support bracket to pivot the motor upward to
loosen the tension on the belt.
5. Remove the worn belt.
6. Put the replacement belt in the pulleys. Allow
the motor to pivot downward.
7. Install the two screws, nuts, and washers in
back of saw head support and through the
motor support bracket.
8. Install the drive belt cover. Install and tighten
the knob on the drive belt cover.