Wellsaw V20-24 - Manual (Page 9)

7
VARIABLE SPEED DIAL
The Variable Speed Dial has been calibrated to measure blade speed
in Surface Feet Per Minute (SFPM). With the saw motor turned off,
select the desired speed range. High range is from 325 to 3000
SFPM. Low range is from 45 to 400 SFPM.
Changing blade speed ranges involves shifting the
drive gears. This should only be done with the saw turned off to avoid
damaging the gears.
Moving the saw blade slightly when changing speeds will help en-
gage the gears properly. Always wear gloves when moving the saw
blade to avoid injury.
After changing speed ranges, start the saw and check the setting on
the dial. Increase speed by turning the handle clockwise.
To re-calibrate the variable speed dial:
1. With the motor running, turn the handle clockwise until it stops at
the slowest speed setting.
2. Loosen set screw on back of handle and remove handle.
3. Holding dial in your hand, turn handle until the red needle points
to the lowest setting.
4. Re-install handle. Tighten set screw.
WHEEL PITCH
If the blade tends to run off the front of the top (idle) wheel, loosen the
locknuts on the back of the slide block, tighten set screw 1/4 turn and
reset the locknuts. Repeat if necessary. The blade does not have to
be loosened to adjust wheel pitch.
To make a similar adjustment on the the lower (drive) wheel, loosen
the lower pair of cap screws on the wheel mounting plate, loosen the
corresponding pair if set screws one turn and tighten the cap screws.
After making a wheel pitch adjustment, turn the wheel several times
by hand to confi rm proper blade tracking. When everything appears
normal, turn the saw on at slow speed to confi rm proper tracking of
the blade.
LUBRICATION
Lubricated-for-life components are used through the saw, including
the motor. The blade tensioning screw and slide should be oiled and
greased occasionally for ease of operation.
Blade Tensioning Screw:
1. Inspect monthly.
2. Use Lubriplate grease 130-A or equivalent.
3. Viscosity at 100°F: SUS 750-800.
4. Military Specifi cation: Mil-G-46003
Gear Case:
1. Inspect monthly.
2. Use 80W90 Gear Kube, Mobile HD 80W90 or equiv.
3. Viscosity at 100°F: SUS 750
4. Military Specification: None.
IDLE WHEEL TIRE
The upper (idle) wheel’s rubber tire fi ts into a recess machined into
the wheel. This allows blades of different sizes to be used without
damaging the set of blade teeth.
To change the idle wheel tire, remove the wheel assembly from the
saw. Secure the wheel in a vise, remove the old tire and install the
new tire. Glue is not normally needed to hold the tire to the wheel.
DRIVE WHEEL TIMING BELT
The timing belt id also the tire for the driven wheel. It transfers power
from the gear box to the driven wheel and also allows blades of differ-
ent sizes to be used without damaging the set of blade teeth.
CHANGING THE TIMING BELT
1. Loosen the four cap screws holding the gear box mount to re-
lease tension on the belt.
2. Remove the old belt and install the new one.
3. Adjust tension so the timing belt is tight and re-tighten the cap
screws on the gear box mount.
4. Check the new belt for tightness after two hours of operation.
Adjust as necessary.
MAINTENANCE
GEAR BOX
1. Periodically check the oil level in the gear box. To do this, re-
move the pipe plug (part number 63 on Gear Box drawing, page
10). Fill to the level of the opening with 90-weight gear oil as
needed. Re-install plug
2. Drain and refill the gear box every three years or as needed.
ROUTINE MAINTENANCE
1. Keep the saw clean and free of chips.
2. Check, adjust and replace blade brushes as needed.
3. Inspect guides and bearings.
4. Check drive belt for proper tightness.
ANNUAL MAINTENANCE
1. Inspect gear box. Lubricate as needed.
2. Replace Blade Guide Rollers
Recommended Service Kits for
Insurance Against Downtime
1 year
100133-002
Brush up to s/n 2281 1
100133-004 Brush after s/n 2282 1
2 years
105454-002
VS belt 1
100140-005 Timing belt 1
100406-001 Blade guide bearings 6
100133-002 Brush up to s/n 2281 1
100133-004 Brush sfter s/n 2282 1
210044-006 Idle wheel tire 1