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26 27
INCORRECT
MORE THAN 30°
TOP PLATE FILING ANGLE
LESS THAN 30°
Fig. 53
30°
CORRECT
INCORRECT
BACKWARD SLOPE
SIDE PLATE FILING ANGLE
Fig. 54
80°
CORRECT
HOOK
FLAT FILE
DEPTH GAUGE JOINTER
Fig. 56
RESTORE ORIGINAL
SHAPE BY ROUNDING
THE FRONT
Fig. 57
MAINTENANCE
TOP PLATE FILING ANGLE
See Figure 53.
n CORRECT 30° – file holders are marked with guide
marks to align file properly to produce correct top plate
angle.
n LESS THAN 30° – for cross cutting.
n MORE THAN 30° – feathered edge dulls quickly.
SIDE PLATE ANGLE
See Figure 54.
n CORRECT 80° – Produced automatically if you use the
correct diameter file in the file holder.
n HOOK – “Grabs” and dulls quickly; increases the
potential of KICKBACK. Results from using a file with
a diameter too small or a file held too low.
n BACKWARD SLOPE – Needs too much feed pressure;
causes excessive wear to the bar and chain. Results
from using a file with a diameter too large or file held
too high.
Fig. 55
RAKER (DEPTH GAUGE) CLEARANCE
.025 in.
MAINTAINING DEPTH GAUGE CLEARANCE
See Figure 55 - 57.
n Maintain the depth gauge at a clearance of .025 in. Use
a depth gauge tool for checking the depth gauge clear-
ances.
n Every time the chain is filed, check the depth gauge
clearance.
�n Use a flat file and a depth gauge jointer to lower all gauges
uniformly. Use a .025 in. depth gauge jointer. After lower-
ing each depth gauge, restore original shape by rounding
the front. Be careful not to damage adjoining drive links
with the edge of the file.
�n Depth gauges must be adjusted with the flat file in the
same direction the adjoining cutter was filed with the
round file. Use care not to contact cutter face with flat
file when adjusting depth gauges.