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• If chain is too loose, refer to =Chain Adjustment." Loosen
bar clamp nuts; then, turn adjusting screw 1/4 turn clock-
wise. Lift up tip of guide bar to check for sag. Retighten
bar clamp nuts. Figure 20.
Guide Bar
CRRFTSMRN'
Tool
SHARPENING CHAIF_ure20
(Fig. 21, 22, 23, 24, 25, 26 & 27)
WARNING:
IMPROPER CHAIN SHARPENING TECH-
NIQUES ANDIOR ,DEPTH GAUGE MAINTE-
NANCE WILL INCREASE THE CHANCE OF
KICKBACK, WHICH CAN RESULT IN SERI-
OUS INJURY.
ALWAYS WEAR GLOVES WHEN HANDLING
THE CHAIN. THE CHAIN CAN BE SHARP
ENOUGH TO CUT YOU EVEN THOUGH IT IS
TOO DULLTO CUTWOOD.
CHAIN TERMINOLOGY & PART NAMES
Preset Tie Strap
LeftHand Cutter
. Link
Right Hand Cutter "_._ _
Guard Tie Strap_
!CHAIN CUTTER PART NAMES
Top Plate .......__Gullet
_1_ =/ / Depth Gauge
Side Plate --_--1_ .{_p;_l_
Toe _ !vet Hole
CHAIN "PITCH" CHAIN "GAUGE"
Pitch refers to chain mea- Gauge refers to thickness
surement.A chain'spitchis of that portion of drive link
the distance between any which fits into saw bar
three of its rivets divided by groove.
two.
Toolsrequired:
• Rat fife
• .025 depth gauge
• 4.5mm roundfile & file holder
Conditionswhichindicatethe need for chain sharpening:
• Reductionin size of wood chips.The size of the wood
chip wil! decrease as the chain gets duller until it
becomesmore likea powderthan a chip.Note that dead
or rottedwood wiltnotproducea good chip.
• Saw cutsto one sideor at an angle.
- Saw requires excessiveforceto cut.
• Noticeabletossofcuttingspeed.
Sharpeninginstructions:
• Move on/stopswitchto the "Stop"position.
• Check chain for propertension.Adjust chain tension if
necessary. (See ChainTension/Adjustment).
• Checkand lowerdepthgaugesbeforesharpeningcutters.
• Depth gauges shouldbe checked every third sharpen.
ing.When cuttingfrozen woodthe depth gauges should
be checked eachtimeyou sharpenthe chain.
• Tocheck depthgauge, placegauge tool on cutter.If the
depthgauge projects above the tool, then file it level to
thetop ofthe depthgauge tool.See Figure21.
Depth File
Gauge
Figure21
.030" Squared
. Rounded Off Comer
Right Way " Wrong Way
Figure22
• To sharpen the cutters,position the fileholder level (90°)
sothat it restson the top edges of the cutter and depth
gauge.See Figure23.
NOTE: The chain has both leftand right handcutters.
• Sharpen cutters on one side of the chainfirst. File from
the inside of each cutter to the outside.Then turn your
saw around and repeat the processfor the other side of
thechain. See Figure24.
• File on the fon_vardstroke only.Use 2 or 3 strokes per
cuttingedge.
• Keep the 30° line on the file holderparallel to the center
of the chain. Reverse procedure for other side. See
Figure25.
• Keep all cuttersthe same lengthwhen filing. See Figure
26.
• Fite enough to remove any damage to cutting edges
(side plate and topplate) of cutter.See Figure 26.
° File chain to meet the specificationsshown below. See
Figure 27.
18-