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107990
OWNER’S MANUAL
For more information, visit www.desatech.com
Note:
For pre-assembled models, the saw
chain tension is properly set at factory. A
new chain will stretch. Check new chain
after first few minutes of operation. Allow
chain to cool down. Follow steps below to
readjust saw chain tension.
1. Before adjusting chain, make sure
guide bar nuts are only finger tight (see
Figure 3, page 6). Also make sure adjust-
ing block is in oval adjusting hole on
guide bar (see Figures 3 and 4, page 6).
2. Turn adjusting screw clockwise until
all slack is out of chain (see Figure 5).
Note:
There should be no gap between
side links of chain and bottom of guide
bar (see Figure 6).
3. Wearing protective gloves, move chain
around guide bar. Chain should move
freely. If chain does not move freely,
loosen chain by turning adjusting screw
counterclockwise.
SAW CHAIN
TENSION
ADJUSTMENT
WARNING: Unplug chain saw
from power source before adjust-
ing saw chain tension.
WARNING: Cutting edges on
chain are sharp. Use protective
gloves when handling chain.
WARNING: Maintain proper
chain tension always. 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, guide bar, and sprocket to
wear rapidly.
Figure 5 - Turning Adjusting Screw
Guide Bar
Correct
Tension
Guide Bar
Gap
Incorrect
Tension
Guide Bar Nuts
Figure 6 - Saw Chain Adjustment
1. Remove oil cap.
2. Fill oil tank with SAE #30 motor oil.
Note:
For temperatures below 30°F, use
SAE #10 oil. For temperatures above
75°F, use SAE #40 oil.
3. Replace oil cap at once. Tighten oil cap
firmly for good seal. This will avoid oil
seepage from tank.
4. Wipe off excess oil.
Note:
It is normal for oil to seep when saw
is not in use. Empty oil tank after each use to
prevent seepage.
FILLING OIL TANK
4. After chain tension is correct, tighten
guide bar nuts firmly. If not, guide bar
will move and loosen chain tension.
This will increase the risk of kickback.
This can also damage saw.
Note:
A new
chain will stretch. Check new chain
after first few minutes of operation.
Allow chain to cool down. Readjust
chain tension.