MAINTENANCE
MARVEL 8 MARK III
© MARVEL MFG. CO., INC. MANUAL 8SDN10871N (04/08)
G-15
7.
After the above adjustment is made, loosen
the tension on the blade with the air ratchet,
reverse the air ratchet and retighten the
blade. If the TORQUE LIMITER CATCH
engages in the TORQUE LIMITER notches
before the proper tension is reached, the set
screw needs to be adjusted to increase the
distance between the TORQUE LIMITER
and the TORQUE LIMITER CATCH.
8.
If the TORQUE LIMITER CATCH does not
engage in the TORQUE LIMITER notches
when the proper tension is reached, the set
screw needs to be adjusted to decrease the
distance between the TORQUE LIMITER
and the TORQUE LIMITER CATCH.
BLADE BREAK/SLIP SENSOR
The blade break sensor is an important safety
feature which automatically stops the saw if a
blade breaks and/or if the blade is not under
sufficient tension to rotate the upper band
wheel. The blade break sensor consists of a
proximity switch that senses the rotation of the
upper band wheel.
1.
If the upper band wheel is not rotating with
the lower band wheel, this would indicate
the presence of insufficient tension on the
saw blade. The saw will immediately stop
operating.
2.
If the upper band wheel stops rotating and
the bottom band wheel continues to rotate,
this would indicate that there is a broken
blade condition or indicate that the blade has
come off of the upper band wheel. The saw
will immediately stop operating.
3.
If the BLADE BREAK SENSOR
arrangement is out of adjustment and the
controls indicate that the upper band wheel
is not rotating when it is indeed rotating, the
proximity switch needs to be adjusted closer
to the upper band wheel.
The above photo shows the proximity switch
mounted relatively close to the upper band
wheel.
POWER FEED SYSTEM
The effective friction operated power feed
system balances the speed of the carriage's
forward travel with the amount of cutting
resistance encountered to provide the optimum
cutting speed. Proper operation of this feed
system depends on the condition of the cork
inserts in the feed pulley and the amount of
slack in the feed chain.
INSPECTING AND REPLACING
CORK INSERTS
Before servicing, release air
pressure from the system by
using the lockout valve and
applying a padlock to prevent
unauthorized application of
compressed air and to avoid
serious injury. The maximum
pressure that is supplied to the
system should NOT exceed
150 PSIG (10.3 BAR) to
prevent component failure and
to avoid serious injury during
normal saw operation.
WARNING
Blade Breakage Sensor Adjustment Nuts
(move sensor closer to upper bandwheel if it
is not sensing wheel rotation)
