Hitachi CS25EPA Owner's Manual page 8

WARNING!
Never try to start engine without side case
securely fastened.
NOTE!
When assembling brand new unit, take off and
discard a piece of cardboard (1) between gear
case and side case. (Fig. 1-8A)
Installation of bar and chain
1. Remove chain bar clamp nuts (2).
2. Remove the side case (1). (Fig. 1-8)
3. Install, the chain bar (1) onto the bolts (2),
then push it toward the sprocket (3) as far as
it will go. Make sure that the boss of chain
tension adjust bolt (4) fits into the hole of the
bar (5). (Fig.1-9)
NOTE!
Slightly move the bar back and forth and make
sure the chain tension boss (4) fits into the hole
(5) in the bar properly.
4. Confirm the direction of saw chain (1) is
correct as in the figure, and align the chain on
the sprocket. (Fig. 1-10)
5. Guide the chain drive links into the bar
groove all around the bar.
6. Install the side case (2) onto the guide bar
clamp bolt. Then fix the clamp nut (3)
temporarily. (Fig. 1-10)
Fig.1-8A
Fig.1-10
7. Raise the bar end, and tighten the chain (1)
by turning the tension adjustment bolt (2)
clockwise. To check proper tension, lightly
lift up the center of chain and there should
be about 0.5-1.0mm clearance between bar
and edge of drive link (3). (Fig.1-11, 12)
CAUTION!
PROPER TENSION IS EXTREMELY
IMPORTANT! (Fig.1-11, 12)
8. Raise the bar end and securely tighten the
chain bar clamp nuts with the box wrench.
(Fig. 1-11)
9. A new chain will stretch so adjust the chain
after a few cuts and watch chain tension
carefully for the first half hour of cutting.
NOTE!
Check the chain tension frequently for
optimum performance and durability.
CAUTION!
When the chain is excessively tightened, the
bar and chain will be damaged rapidly.
Conversely, when the chain is excessively
loosened, it may get out of the groove in the
bar.
Always wear gloves when touching the chain.
Fig.1-8
Fig.1-11
WARNING!
During operation, hold chain saw firmly
with both hands. A single hand operation
may cause serious injury.
Fig.1-9
Fig.1-12
GB-7