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OPERATION
Chain Tension
WARNING: Never touch or adjust the chain while the
motor is running. The saw chain is very sharp,
always wear protective gloves when performing
maintenance to the chain.
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1. Stop the engine before setting the chain tension. Loosen
the guide bar nuts slightly, turn the chain tensioning screw
clockwise to tension the chain. Refer to Assembly-Assembling
the Bar and Chain Section. Retighten guide bar nuts. A cold
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chain is correctly tensioned when there is no slack on the
underside of the guide bar, the chain is snug, but it can be
turned by hand without binding.
For warm chain, see Item 3.
2. Chain must be retensioned whenever the flats (A) on the drive
link tangs hang out of the bar groove. See Fig. 29.
3. During normal saw operation, the temperature of the chain will
increase. The drive link tangs of a correctly tensioned warm
chain will hang approximately .050" (1.25 mm) out of the bar
groove. See Fig. 30. To help determine the correct warm chain
tension, the tip of the combination wrench (Fig. 31) can be
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used as a guide.
CAUTION: Chain tensioned while warm, may be too
tight upon cooling. Check the "cold tension" before
next use.
CAUTION: A new chain has to be retensioned more
often than one that has been in use for some time.
Breaking-in the Chain
New chains will stretch and must be tightened frequently.
Lift the chain out of the bar groove and lubricate the bar groove
with additional oil, see Fig. 32. Place the chain saw on a piece of
cardboard or scrap plywood. Start the chain saw (refer to the
Operation-Starting Engine Section) and allow it to run at moderate
speed for approximately one (1) minute. Stop the engine. Check
that the oil pump is working properly. The cardboard should have
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excess oil from the chain rotation if the oil pump is working
properly, see Fig. 33. Adjust the chain tension (refer to Operation-
Chain Tension Section). Start the saw again and make a few cuts
in a log to heat up the chain. Stop the engine and re-adjust chain
again. Repeat this process until the chain retains proper warm
tension adjustment as shown in Fig. 30 in Operation-Chain
Tensioning Section. Never touch the ground with the chain.
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