Craftsman 172.740500 Operator's Manual page 15

OPERATION cont.
1
GENERAL CUTTING cont.
BUCKING A LOG cont.
2/3
3. When the log is supported on both
ends, as illustrated, cut 1/3 the
diameter from the top overbuck.
Then make the finished cut by
underbucking the lower 2/3 to meet
the first cut. (See Fig. 21)
4. When bucking on a slope always
stand on the uphill side of the log as
illustrated. (See Fig. 22)
5. When "cutting through", to maintain
complete control release the cutting
pressure near the end of the cut
without relaxing your grip on the chain
saw handles. Don't let the chain
contact the ground.
After completing the cut, wait for
the saw chain to stop before you
move the chain saw.
Always stop the motor before
moving from tree to tree.
MAINTENANCE AND STORAGE OF CHAIN SAW
GENERAL MAINTENANCE
WARNING:
Before performing any work on Chain Saw, disconnect
!
Chain Saw's power plug from the extension cord and power source.
NOTE: To ensure long and reliable service, carry out the following maintenance
regularly and before each use:
Regularly check for obvious defects such as loose, dislodged or damaged chain and
guide bar, loose fixings and worn or damaged components. Inspect the switch and cord
for damage. Check that covers and guards are undamaged and correctly fitted.
WARNING:
DO NOT use Chain Saw if it has any broken parts.
!
ALWAYS have damaged, missing, worn or broken parts replaced before using.
NOTE: WHEN SERVICING a tool, use only identical replacement parts.
Use of unauthorized parts or failure to follow maintenance instructions may create
a risk of electric shock or injury.
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MAINTENANCE AND STORAGE OF CHAIN SAW cont.
Fig. 21
WARNING! If power supply cord is damaged stop tool use immediately. Take tool to a qualified
2
service dealer for inspection and possible repair using identical replacement parts.
1/3 1. Unplug chain saw from power source
• When not in use • Before moving from one place to another
• Before servicing • Before changing accessories or attachments, such as saw chain and guard
2. Inspect chain saw before and after each use. Check saw closely if guard or other part has
been damaged. Check for any damage that may affect operator safety or operation of saw.
Check for alignment or binding of moving parts. Check for broken or damaged parts.
Do not use chain saw if damage affects safety or operation. Take saw to a qualified service
dealer for inspection and possible repair using identical replacement parts. Before transporting,
empty all oil from the chain oil reservoir.
3. Maintain chain saw with care.
• Never expose saw to rain.
• Keep chain sharp, clean, and lubricated for better and safer performance.
• Follow steps outlined in this manual to sharpen chain.
• Keep handles dry, clean, and free of oil and grease.
Fig. 22
• Keep all screws and nuts tight.
• Inspect power cord often. If damaged, stop use immediately and take take chain saw to a
qualified service dealer for inspection and possible repair using identical replacement parts.
• Never carry chain saw by power cord.
• Never yank power cord to unplug it.
Always stand • Keep power cord from heat, oil, and sharp edges.
on the uphill
• Inspect extension cords often and replace if damaged.
side of the log
4. When servicing, use only identical replacement parts.
5. When not in use, always store chain saw
• in a high or locked place, out of children's reach
BAR MAINTENANCE
To maximize bar life, the following bar maintenance is recommended. The bar rails that carry the
chain should be cleaned before storing the tool or if the bar or chain appears to be dirty.
The rails should be cleaned every time the chain is removed. Turn the bar over and reinstall,
top rail becoming bottom and bottom rail becoming top, around every 5 hours of use.
TO CLEAN THE BAR RAILS:
1. Remove chain cover and bar and chain.
(see ASSEMBLY section)
2. Using a wire brush, screwdriver or similar tool, clear the
residue from the inner groove of the bar. (See Fig. A)
3. Make sure to clean oil passages thoroughly.
CONDITIONS WHICH REQUIRE GUIDE BAR
MAINTENANCE
• Saw cuts to one side or at an angle. • Saw has to be forced through the cut.
• Inadequate supply of oil to the bar and chain.
Check the condition of the Guide Bar each time the chain is sharpened. A worn Guide Bar will
damage the chain and make cutting difficult. After each use, with unit disconnected from power
source, clean all sawdust from the Guide Bar and sprocket hole. File uneven edges of worn groove
as shown in illustration below.
Replace the Guide Bar when excessively worn and the
groove can no longer be filed even, the Guide Bar is bent
or cracked, or when excess heating or burring of the rails
occurs. If replacement is necessary, use only the Guide Bar
specified for your saw in the repair parts list or on the decal
located on the chain saw.
• in a dry place
Fig. A
When rail top is uneven, use a flat file
to restore square edges and sides.
File Rail Edges
and Sides
Correct Groove
Worn Groove
29