Assembly And Adjustments - Craftsman 172.740500 Operator's Manual

ASSEMBLY & ADJUSTMENTS
INTENDED USE
The chain saw is intended for wood: sawing of trees, tree trunks, branches, wooden beams,
planks, etc. Cuts can be sawed with or across the grain. This product is not suitable
for sawing mineral materials, plastics or non-wood building materials.
ASSEMBLY
NOTE: This Chain Saw comes fully assembled, including the Chain /Chain Bar Assembly.
See below for Chain/Chain Bar Replacement.
WARNING:
! Do not connect the chain saw to extension cord and power source
before it is completely assembled. Always use gloves when handling the chain.
CHAIN AND CHAIN BAR ASSEMBLY/REPLACEMENT
(See Figs. 4a, 4b, 4c, 4d and Pgs 14-15 for part reference)
1. Place the chain saw on any suitable flat surface.
2. (See Fig. 4a) Slide the chain (8) in the slot around the guide bar (7). Ensure chain is in
correct running direction by comparing with chain symbol (15). Ensure the chain tensioning
catch (16) is facing outwards.
3. (See Fig. 4b) Fit the chain onto the drive sprocket (13) and guide the guide bar (7), so that
the fastening bar bolt (18) and the two guide fins (14) fit into the keyway of the guide bar (7).
Fig. 4a Fig. 4b
8
7
13
4. Check to make sure all parts are seated Fig. 4c
properly and hold chain and guide bar in
a level position. (See Fig. 4c)
5. Fit cover plate into place. Ensure that the
chain catcher (17) fits into the groove of the
cover plate (12). (See Figs. 2 & 3, pg.15)
6. Tighten the Chain Cover by turning the
Chain Tensioning Knob (11) clockwise until
it is tight. (See Figs. 4c and 4d)
NOTE: The chain is not yet tensioned.
Tensioning the chain applies as described
in the TENSIONING CHAIN section.
16
ASSEMBLY & ADJUSTMENTS cont.
TENSIONING CHAIN
Always check the chain tension before use,
after the first cuts and regularly during use.
Upon initial operation, new chains can lengthen
considerably.
WARNING:
Unplug chain saw from
!
power source before adjusting saw chain
tension.
WARNING:
Cutting edges on chain
!
are sharp. Use protective gloves when
handling chain.
WARNING: ALWAYS
! Maintain proper chain tension. A loose chain will
increase the risk of kickback. A loose chain may jump out of guide bar groove.
This may injure operator and damage chain. A loose chain will cause chain, chain
bar, and sprocket to wear rapidly. The chain life of the saw chain mainly depends
upon sufficient lubrication and correct tensioning. Avoid tensioning the chain if it
is hot, as this will cause the chain to become over tensioned when it cools down.
1. Place the chain saw on any suitable flat surface.
2. Turn the Chain Tensioning Knob (11) clockwise
until it is hand tight (See Fig.4d).
18
The tension is automatically set while the
14
Chain Tensioning Knob is being tightened.
The ratchet mechanism prevents the chain
tension from loosening.
3. Double check the tension set by the
automatic Chain Tensioning Knob.
The correct chain tension is reached when the
chain can be raised approximately 1/8 to 1/4 in. (3-6 mm) from the Guide Bar in the center.
This should be done by using one hand to raise the chain against the weight of the machine.
4. The Chain will stretch from use and lose proper tension. To retension chain, first loosen
the Chain Tension knob by turning counterclockwise 3 full turns. Make sure that the
cover plate is securely in place.
Proceed to retension chain by repeating steps 1 - 3 listed above.
Fig. 4d
11
Fig. 5
NOTE: Use one hand
to raise chain.
approx.
1/8 to 1/4-in.
(3-6 mm)
17