Efco MT4400 Manuel d'instructions télécharger pdf (Page 17)

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.

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

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

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

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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Efco MT4400 Manuel d'instructions Page 17