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8. Maintenace of guide bar and saw chain
Saw chain
Warning! It is very important that the saw chain is sharp for safe and effective
use of the chain saw.
Chain should be sharpened:
• When saw dust becomes like powder.
• When the chain saw needs to be pressed against the object to be cut.
• When the cut is not straight.
• When vibration increases:
• When use of fuel increases:
Warning! Always use work gloves while handling the saw chain.
Before filing begins:
• Make sure that the chain saw is shut off.
• Make sure that the chain saw is held in a steady grip.
• Make sure that you have the correct equipment: A good file with the correct dimension:
Ø 4mm and preferably some type of filing gauge for filing at the right angle and depth.
Chain type: 91VG
File diameter: Ø 4 mm (5/32
″
)
Place the saw in a cut track or in a screw vice so that both hands can be
used for filing.
Place the file in a tooth and push the file forward according to the picture.
File each tooth equally. Keep count of how many cutting teeth which are
filed so you know when the whole chain is filed.
When all the teeth have been filed the clearance heels must be measured
and filed to correct height according to the picture.
Warning! Remember to round off the support heels to reduce the
risk for kickback or chain break.
Figure 35
Figure 36
Round off the support heels
(keep the original angle)
Support size 0.64 mm.
Support template
Figure 37
Check that all the cutting teeth have the same length and cutting angle illustrated in the picture:
Cutter length
Filing angle
Angle cutting
teeth side
Cutting teeth
Figure 38
