MAINTENANCE
WARNING:
Improper chain sharpening increases the poten- tial of kickback.
WARNING:
Failure to replace or repair damaged chain can cause serious injury.
WARNING:
Use a flat file and a depth gauge jointer to lower all gauges uniformly. Depth gauge jointers are available in .020 in. to .035 in. Use a .025 in. depth gauge jointer. After lowering each depth gauge, restore original shape by rounding the front. Be careful not to damage adjoining drive links with the edge of the file.
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.
The saw chain is very sharp, always wear pro- tective gloves when performing maintenance to the chain.
TOP PLATE FILING ANGLE
See Figure 34.
CORRECT 30° - File holders are marked with |
guide marks to align file properly to produce |
correct top plate angle. |
CORRECT TOP PLATE
FILING ANGLE
30°
INCORRECT TOP PLATE FILING
ANGLE
LESS | MORE |
THAN 30° | THAN 30° |
Fig. 34
LESS THAN 30° - For Cross Cutting. |
MORE THAN 30° - Feathered Edge Dulls Quickly. |
SIDE PLATE ANGLE
See Figure 35.
CORRECT - 80° Produced automatically if cor- |
rect diameter file is used in file holder. |
HOOK - “Grabs” and dulls quickly. Increases |
potential of KICKBACK. |
Results from using a file with diameter too small, |
or file held too low. |
CORRECT SIDE PLATE FILING ANGLE
80°
INCORRECT SIDE PLATE
FILING ANGLE
HOOK BACKWARD SLOPE
Fig. 35
BACKWARD SLOPE - Needs too much feed |
pressure, causes excessive wear to bar and |
chain. |
Results from using a file with diameter too large, |
or file held too high. |
DEPTH GAUGE CLEARANCE
See Figure 36 - 38.
RAKER CLEARANCE
.025 in.
Fig. 36
The depth gauge should be maintained at a clearance of .025 in. Use a depth gauge tool for checking the depth gauge clearances.
Every time the chain is filed, check the depth gauge clearance.
23 - English