MAINTENANCE
Top Plate Filing Angle
See Figure 35.
CORRECT 30° - File holders are marked with guide marks to align file properly to produce correct top plate angle.
LESS THAN 30° - For Cross Cutting.
MORE THAN 30° - Feathered Edge Dulls Quick- ly.
Side Plate Angle
See Figure 36.
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.
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 37 - 39.
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.
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.
GUIDE BAR MAINTENANCE
See Figure 40.
When the guide bar shows signs of wear, reverse it on the saw to distribute the wear for maximum bar life. The bar should be cleaned every day of use and checked for wear and damage.
Feathering or burring of the bar rails is a normal pro- cess of bar wear. Such faults should be smoothed with a file as soon as they occur.
A bar with any of the following faults should be replaced.
Wear inside the bar rails which permits the chain to lay over sideways.
Bent guide bar.
Cracked or broken rails.
Spread rails.
In addition, guide bars with a sprocket at their tip must be lubricated weekly with a grease syringe to extend the guide bar life. Using a grease syringe, lubricate weekly in the lubricating hole.
Turn the guide bar and check that the lubrication holes and chain groove are free from impurities.
Reversing the guide bar
See Figures 41 - 42.
Remove the
Remove the
Remove the chain from the bar and turn the bar over.
NOTE: Bottom of bar should not be on top.
Replace the chain on the bar. Refer to Assem- bling the Bar and Chain earlier in this manual for specific information.
Replace the
NOTE: The locking tab fits in the recessed hole in the bar.
Tighten the screw with your finger.
From the
19 - English