MAINTENANCE
CHAIN MAINTENANCE
See Figure 27.
For smooth and fast cutting, the chain needs to be main- tained properly. The following conditions indicate that the chain requires sharpening:
nWood chips are small and powdery
nChain must be forced through the wood during cutting
nChain cuts to one side
During maintenance of the chain, consider the following:
nImproper filing angle of the side plate can increase the risk of a severe kickback.
nDepth gauge (or raker clearance) setting determines the height the cutter enters the wood and the size of the wood chip that is removed. Too much clearance increases the potential for kickback. Too little clearance decreases the size of the wood chip thus decreasing the chain's cutting ability.
nIf cutter teeth have hit hard objects such as nails and stones, or have been abraded by mud or sand on the wood, have service dealer sharpen chain.
DEPTH GAUGE SETTING
Fig. 27
HOW TO SHARPEN THE CUTTERS
See Figures 28 - 31.
Be careful to file all cutters to the specified angles and to the same length, as fast cutting can be obtained only when all cutters are uniform.
PARTS OF A CUTTER
TOP PLATE | CUTTING CORNER |
| |
|
|
| |
|
| SIDE PLATE |
|
RIVET HOLE |
| DEPTH GAUGE | |
|
|
| |
HEEL |
|
|
|
| GULLET | TOE | Fig. 28 |
|
| ||
nTighten the chain tension enough that the chain does not wobble. Do all of your filing at the
nUse a 5/32 in. diameter round file and holder.
nKeep the file level with the top plate of the tooth. Do not let the file dip or rock.
Fig. 29
nUsing light but firm pressure, stroke towards the front corner of the tooth. Lift file away from the steel on each return stroke.
Fig. 30
nPut a few firm strokes on every tooth. File all left hand cutters in one direction. Then move to the other side and file the right hand cutters in the opposite direction. Oc- casionally remove filings from the file with a wire brush.
LEFT HAND
CUTTERS
RIGHT HAND
CUTTERS
Fig. 31
18