Chain Maintenance - Craftsman 151.74326 Manual Del Usuario

■ Disassemble the guide bar and saw chain
in reversed order from assembly.
■ Check the oiling port for clogging and clean
if necessary to ensure proper lubrication of
the guide bar and saw chain during operation.
Insert a soft wire small enough to fit into the
oiling port to clean it out. (Fig. 38)
NOTE: The condition of the oil passages can
be easily checked. If the passages are clear,
the chain will automatically give off a spray
of oil within seconds of the product starting.
Your product is equipped with an automatic
oiling system.
■ Check the drive sprocket. If it is worn or
damaged due to strain, have it replaced by a
qualified service center.
■ Clear residue from the rails on the guide
bar using a screwdriver, putty knife, wire
brush or other similar tool. This will keep
the oil passages open to provide proper
lubrication to the bar and chain. (Fig. 39)
■ Check the guide bar 'rail' for wear: Hold a
ruler (straight edge) against the side of the
guide bar and 'cutter side plates'. If there is
a gap between the ruler and guide bar the
guide bar 'rail' is normal. If there is no gap
(ruler flush against the side of the guide bar)
the guide bar 'rail' is worn and needs to be
replaced with a new one of the same type.
(Fig. 40)
■ Reverse the guide bar from time to time
to allow for even wear, which will extend the
life span of the bar. Loosen the screw and
remove the tension disc from the guide bar.
Loosen the screw and remove the tension
disc from the guide bar.
■ Ensure the rubber washer on the screw is
free of wear. Turn the guide bar and fix the
tension disc with the screw. Apply a drop of
suitable glue to the screw to ensure its safe
positioning when reassembled. (Fig. 41)

CHAIN MAINTENANCE

Know your saw chain (See Figure 42-43,
page xi)
CARE AND MAINTENANCE
23 ― English
Use only a recommended low-kickback chain
on this saw. This fast-cutting chain provides
kickback reduction when properly maintained.
For smooth and fast cutting, maintain the
chain properly. The chain requires sharpening
when the wood chips are small and powdery,
the chain must be forced through the wood
during cutting, or the chain cuts to one side.
During maintenance of the chain, consider
the following:
■ Improper filing angle of the side plate
(Fig. 43) can increase the risk of severe
kickback.
■ Depth gauge setting (Fig. 45):
- Cutting edges worn too low increases the
potential for kickback.
- Cutting edges not low enough decreases
cutting ability.
■ If the chain cutters hit hard objects such as
nails and stones, or are abraded by mud or
sand on the wood, take the saw to a qualified
pole saw service center to have the chain
sharpened. Use only identical parts as listed
in this manual.
NOTE: Inspect the drive sprocket for wear or
damage when replacing the chain. If signs
of wear or damage are present in the areas
indicated, take the saw to a qualified pole
saw service center to have the sprocket
replaced. Use only identical parts as listed in
this manual.
Check the saw chain for possible wear
and damages. Replace it with a new one if
required. Experienced users can sharpen
a dull saw chain (see section "Saw chain
sharpening" below). Refit the saw chain and
the guide bar as described in Replacing the
Guide Bar and Chain section.
NOTE: If you do not fully understand the
correct procedure for sharpening the chain
after reading the instructions that follow,
have the saw chain sharpened by a qualified
pole saw service center or replaced with a
recommended low-kickback chain.