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51
50
49
48
Fig. 39
39. Top plate
40. Working corner
41. Side plate
42. Gullet
43. Heel
44. Chassis
45. Rivet hole
46. To e
47. Depth gauge
48. Correct angle on top plate (degree of angle depends on chain
type)
49. Slightly protruding “hook” or point (curve on non-chisel chain)
50. Top of depth gauge at correct height below
top plate
51. Front of depth gauge rounded off
LOWERING DEPTH GAUGES WITH A FILE
1) If you sharpen your cutters with a fi le holder, check and lower the
depth.
2) Check depth gauges every third sharpening.
3) Place depth gauge tool on cutter. If depth gauge projects, fi le
it level with
the top of the tool. Always fi le from the inside of the
chain toward an outside cutter. (Fig. 40)
Fig. 40
4) Round off 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. 41)
Fig. 41
GENERAL INSTRUCTIONS FOR FILING CUTTERS
File (52) cutter on one side of the chain from the inside out. File on
forward stroke only. (Fig. 42)
52
5252
Fig. 42
5) Keep all cutters the same length. (Fig. 43)
Fig. 43
6) File enough to remove any damage to cutting edges (side plate
(53) and top plate (54)) of cutter. (Fig. 44)
53
54
Fig. 44
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 will fi nd some general maintenance instructions. For
further information please contact HITACHI dealer.
Daily maintenance
○ Clean the exterior of the unit.
○ Clean the chain oil fi lter port.
○ Clean the groove and oil fi lter 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 suffi ciently tightened.
○ Make sure that the chain transport guard is undamaged and that
it can be securely fi tted.
○ Check that nuts and screws are suffi ciently tightened.
○ 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 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.
○ Clean the cooling fi ns on the cylinder and check that the air
intake at the starter is not clogged.
○ Clean the air fi lter.