Oregon 720-120 Original Instruction Manual page 31

720-120
13 Set the cutter top plate to equal lengths. If
the right (outer) and left (inner) cutters are
not sharpened to equal lengths, follow these
steps:
• Do a sharpening test on a test chain
according to the instructions in section
7.2, "Sharpening test".
• Make sure that the right and left cutters
are sharpened to equal lengths. Use the
template provided with the machine to
measure. If they are not equally long, turn
the left-right alignment screw:
I– clockwise to decrease the length of the
right cutter and increase the length of
the left cutter, or
II– counterclockwise to increase the length
of the right cutter and decrease the
length of the left cutter.
• Repeat the sharpening test until the cutter
top plates are sharpened to equal lengths.
14 The diameter of the grinding wheel
decreases when it is used. To maintain the
grinding proportions, the grinding wheel
position must be changed when:
• the grinding wheel has been worn, or
• the chain has a different pitch that
requires a different wheel. The grinding
wheel centering knob is used to center
the grinding wheel over the chain. The
gullets should have equal depth on the
left and right cutters.
I– Sharpen a few links and then visually
inspect the result. If the grinding depth
is not equal on the gullets of the right
and left cutters, continue to the next
step.
II– Turn the grinding wheel centering
knob to move the grinding motor and
the wheel up or down. Set the arrow on
the scale to point to the number that
corresponds to the wheel diameter, as
displayed below. These scale numbers
are approximate and are only for
general guidance. Observe if the
grinding depth of right and left gullets
are equal for final adjustment.
Grinding wheel diameter:
5.9" (150 mm)
(new grinding wheels)
5.5" (140 mm)
5.1" (130 mm)
585124ab_Auto Chain Grinder_OM_720-120.indd 31
• Repeat steps I-II until the grinding depth
is equal.
15 To set the approximate grinding length, turn
the chain pusher adjustment knob:
• clockwise, to grind more, resulting in a
shorter cutter top plate, or
• counterclockwise, to grind less, resulting
in a longer cutter top plate.
16 If required: Change the grinding setting for
the height of the depth gauges.
Set the depth gauge height:
• Do a sharpening test on a test chain,
according to the instructions in section
7.2, "Sharpening test."
• Use an Oregon flat file to set the height of
the depth gauge. Once you have set the
depth gauge, refer back to the template
to make sure it meets the correct
specifications.
• Use the set depth gauge to adjust the
position of the machine to set up the
Scale:
remaining depth gauges. Turn the depth
gauge height knob:
1-3
I– clockwise to set the first depth gauge
3-5
by hand using the flat file and depth
4-6
gauge tool.
5 Operation
31
3/1/17 3:05 PM