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English
48. Toe
49. Depth gauge
50. Correct angle on top plate (degree of angle depends on chain
type)
51. Slightly protruding “hook” or point (curve on non-chisel chain)
52. Top of depth gauge at correct height below top plate
53. Front of depth gauge rounded o
LOWERING DEPTH GAUGES WITH A FILE
1)
If you sharpen your cutters with ale holder, check and lower the
depth.
2) Check depth gauges every third sharpening.
3) Place depth gauge tool on cutter. If depth gauge projects,le
it level with the top of the tool. Alwaysle from the inside of the
chain toward an outside
cutter. (Fig. 41)
4) Round o front corner to maintain original shape of depth gauge
after using depth gauge tool. Always follow the recommended
depth gauge setting found in the maintenance or operator
manual for your saw. (Fig. 42)
GENERAL INSTRUCTIONS FOR FILING CUTTERS
File (54) cutter on one
side of the chain from the inside out. File on
forward stroke only. (Fig. 43)
5) Keep all cutters the same length. (Fig. 44)
6) File enough to remove any damage to cutting edges (side plate
(55) and top plate (56)) of cutter. (Fig. 45)
SHARPENING ANGLES FOR SHARPENING
SAW CHAIN
1. Part Number 91VG
2. Pitch 3/8”
3. Depth Gauge Setting 0.025"
4. Side Plate Filing Angle 80°
5. Top Plate Angle 30°
6. File Guide Angle 90°
Maintenance schedule
Below you willnd some general maintenance instructions. For
further information please contact HITACHI dealer.
Inspection and service before use
Check that no peel-o , degradation, or damage is observed in
the Anti-Vibration rubber members, and no loosening or damage
is observed in theirxtures.
Check that no damage is observed in the Anti-Vibration springs,
and no loosening or damage is observed in theirxtures.
Check that no deformation or damage is observed in the front
and rear handles.
Check that thextures for front and rear handles are su ciently
tightened
and free of damage.
Check that bolts, nuts, etc. used for each part are su ciently
tightened and free of damage.
Daily maintenance
Clean the exterior of the unit.
Clean the chain oillter port.
Clean the groove and oillter port in the guide bar.
Clean
the side case of saw dust.
Check that the saw chain is sharp.
Check that the bar nuts are su ciently tightened.
Make sure that the chain transport guard is undamaged and that
it can be securelytted.
Check that nuts and screws are su ciently tightened.
Especially
inspect the bolt of mu er and ensure that they are
properly tightened before starting engine. Should any of the
bolts be loose, retighten them immediately. Failure to do so
could result in serious hazard.
Check the tip of the bar. Please exchange it for the new one
when
it is worn out.
Check the band of chain brake. Please exchange it for the new
one when it is worn out.
Weekly maintenance
Check the recoil starter, especially cord and return spring.
Clean the exterior of the spark plug.
Remove the spark plug and check the electrode gap.
Adjust it to
0.6 mm or change the spark plug.
Check that the air intake at the recoil starter is not clogged.
Clean the airlter.
Monthly maintenance
Rinse the fuel tank with gasoline, and clean fuellter.
Clean chain oillter.
Clean the exterior of the carburetor and
the space around it.
Quarterly maintenance
Clean the coolingns on the cylinder.
Clean the fan and the space around it.
Clean the mu er of carbon.
CAUTION
Cleaning of cylinderns, fan and mu er shall be done by a
HITACHI Authorized Service Center.
NOTE
When ordering
the parts to your nearest dealer, please use the
item numbers showing on the parts breakdown section in this
instruction.
BAR NO.
LENGTH-
TYPE
NOSE-
TYPE
CHAIN
NO.
(OREGON)
MODEL NO.
E&S
PO12-50CR
PO14-50CR
12
14
SPROCKET
SPROCKET
91VG045
91VG052
000Book_CS33EDT_WE.indb 13000Book_CS33EDT_WE.indb 13 2011/08/06 9:14:562011/08/06 9:14:56
14


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