Oregon Qualcast PC40 Operation And Maintenance Manual page 9

Preparing to Operate the Chainsaw
Step 2 - Assembly instructions
11. Install the clutch cover making sure the tang is positioned in the lower hole in the guide bar. Make
sure the chain does not slip off of the bar.
12. Lock the screw
13. Turn the tension ring clockwise until tight
tightly then push the control button back. (Fig.3G)
NOTE: The guide bar retaining knob is installed only hand tight at this point because saw chain
adjustment is required. Follow instructions in Section, Saw Chain Tension Adjustment.
SAW CHAIN TENSION ADJUSTMENT
Proper tension of saw chain is extremely important and must be checked before starting, as well as
during any cutting operation.
Taking the time to make needed adjustments to the saw chain will result in improved cutting
performance and prolonged chain life.
WARNING: Always stop engine and wear heavy duty gloves when handling saw chain or making saw
chain adjustments.
NOTE: If chain is dif cult to rotate on guide bar or if it binds, too much tension has been applied.This
requires minor adjustment as follows:
A. Loosen the bar retaining knob so they are nger tight. Decrease tension by turning the bar
adjustment chain ring COUNTERCLOCKWISE slowly.Move chain back and forth on bar.Continue
to adjust until chain rotates freely, but ts snugly. Increase tension by turning bar adjustment chain
ring CLOCKWISE.
B. When saw chain has proper tension, hold nose of bar in the uppermost position and tighten the
bar retaining knob securely.
CAUTION: A new saw chain stretches, requiring adjustment after as few as 5 cuts. This is normal
with a new chain, and the interval between future adjustments will lengthen quickly.
A
CHAIN BRAKE MECHANICAL TEST
Your chainsaw is equipped with a Chain brake that reduces possibility of injury due to kickback.The
brake is activated if pressure is applied against brake lever when, as in the event of kickback,
operator's hand strikes the lever.When the brake is actuated, chain movement stops abruptly.
be tight, and follow step 13 to adjust the chain tension.
N
14
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Fig. 4
B C
Fig. 5
Customer Helpline
; pull the control button by arrow direction
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TO ADJUST SAW CHAIN:
1. Hold nose of guide bar up and turn adjustment chain
ring CLOCKWISE to increase chain tension. Turning
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chain ring COUNTERCLOCKWISE will decrease
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amount of tension on chain. Ensure the chain ts snugly
all the way around the guide bar. (Fig.4)
2. After making adjustment, and while still holding nose of
bar in the uppermost position, tighten the bar retaining
button securely.Chain has proper tension when it
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has a snug t all around and can be pulled around by
gloved hand. (Fig.4)
CAUTION: If saw chain is TOO LOOSE or TOO TIGHT,
the sprocket, bar, chain, and crankshaft bearings will
wear more rapidly. Study Fig. 5 for information
concerning correct cold tension (A), correct warm
tension (B), and as a guide for when saw chain needs
adjustment (C).
0844 801 3652
to turn
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