SL7 1TB
Customer Helpline 0845 600 5526 Monday to Friday 09.00 to 17.00
www.JCBdiy.com
Note:
A dull or improperly sharpened chain can cause excessive engine speed
during cutting, which may result in severe engine damage.
WARNING
Improper chain sharpening increases the potential of kickback.
WARNING
Failure to replace or repair a damaged chain can cause serious injury.
TOP PLATE FILE ANGLE
See Figure 52.
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 quickly.
SIDE PLATE ANGLE
See Figure 53.
CORRECT 80° – produced automatically if you use the correct diameter file in the
file holder.
HOOK – “grabs” and dulls quickly; increases the potential of kickback. Results from
using a file with a diameter too small or a file held too low.
BACKWARD SLOPE – needs too much feed pressure; causes excessive wear to
the bar and chain. Results from using a file with a diameter too large or file held
too high.
MAINTAINING DEPTH GAUGE CLEARANCE
See Figures 54-56.
Maintain the depth gauge at a clearance of 0.64 mm. 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. Use a 0.64
mm 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.
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12/3/2010 5:58:31 PM