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POWER SHARP STONE ROTATION
(MODEL 917_353770 & 917o353771 ONLY)
Reverse the Power Sharp Stone to even Stone wear, perhaps
every third or fourth sharpening, as needed. An unevenly worn
Power Sharp Stone may sharpen Chain on an angle. Cutter
Tops will not look flat when sighted down the Guide Bar,
Chain will stumble through wood when cutting or cut slanted,
1. Remove Guide Bar Nuts and Screw in rear of Chain Shield
(Fig, 7)_ Remove Chain Shield
2_ Loosen Stone Retaining Screw to slide Power Sharp Stone
from Arctuating Arm (Fig_ 38)
3. Turn Stone end for end, slide it on Arctuating Arm, reposi-
tion and tighten Retaining Screw,
4, Reassemble Saw and re-tension Chain (pages 3 and 4),
GUIDE BAR REPAIR
1. Chain Cutter and Link bottoms riding on Guide Bar Rails
will normally roll some Bar Material to the outside of the
_bails ff_pecially in actual cutting area of Guide Bar, These
urrs" should be removed as they form or they will chip
away during use taking more Bar material with them,
Check Bar for burrs at each Chain sharpening (Fig. 39),
a, Remove Guide Bar Nuts, Screw in rear of Chain Shield,
Chain Shield and Outer Chain Guide. Loosen Chain
Tension, remove Chain and Guide Bar,
bo Move your gloved hand across the flat of the Guide Bar
to feel burrs and remove them with a Flat Fife. Round-
ing outside Rail edges will retard further burr formation
(Fig, 40),
co Reassemble Saw and re-tension Chain (pages 3 and 4)°
NOTE: YOUR GUIDE BAR IS SPECIAL "LO-KICK"
TYPE AND CAN ONLY BE ASSEMBLED IN ONE POSI-
TIONo
2o When new or newly sharpened Chain makes slanted cuts,
sometimes badly enough to prevent completion of cuts
through large diameter logs, check for Guide Bar wear or
damage.
ao File uneven Rail top wear flat, perpendicular to Guide
Bar (Fig. 39),
b. Hammer worn, open Rails closer together to restore
correct Chain Groove--between .052 and .060 inch (Fig,
39), NOTE: MAKE SURE CHAIN RUNS EASILY IN
CORRECTED CHAIN GROOVE BEFORE REASSEM-
BLY.
co A badly bent Guide Bar or Rails worn low enough to
allow Chain Drive Links to ride on the Chain Groove
bottom must be professionally serviced or reptaced:
RAIL TOPS
WORN OPEN
AND SLANTED,
BURRS FORMING
RAIL TOPS
POUNDED CLOSED
AND FILED LEVEL,
BURRS ROUNDED OFF
FIGURE 39
CHAIN REPLACEMENT
Normal Chain sharpening will eventually remove enough mat _
erial to weaken Cutters and cause damage during use. Individ-
ual Cutters can be replaced and sharpened to match Chain
in a Sears Service Center, however, repeated Cutter or Link
breakage indicates Chain replacement isrequired°
NOTE: A damaged Cutter on Top Sharp Chain (MODEL
917.353770 & 917o353771), should not be replaced by
another Cutter due to the difficulty in sharpening it to match
other worn Cutters, Use of a Tie Strap (Fig, 28) to replace an
individual damaged Cutter will not noticeably affect the cut °
ting ability of your chain,
POWER SHARP STONE REPLACEMENT
(MODEL 917.353770 & 917.353771 ON LY)
Replace Power Sharp Stone when installing new Chain (Fig°
38),
CHAIN SPROCKET REPLACEMENT
Replace worn Chain Sprocket when installing new Chain_
Clutch Drum removal (page 14) isrequired, - 11
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