MAINTENANCE
snug, but it can be turned by hand without binding. Ensure that the chain brake is not set.
NOTE: If chain is too tight, it will not rotate. Loosen the clutch cover lock knob by pressing in and slightly rotating counterclockwise, then rotate the chain tensioning dial counterclockwise. Lift the tip of the guide bar up and retighten the clutch cover lock knob securely. Ensure that the chain will rotate without binding.
ADJUSTING THE CHAIN TENSION
See Figures 44 - 46.
WARNING:
Never touch or adjust the chain while the engine is running. The saw chain is very sharp. Always wear protective gloves when performing main- tenance on the chain.
nStop the engine before setting the chain ten- sion.
nSlightly loosen the clutch cover lock knob by pressing in and rotating counterclockwise.
nTurn the chain tensioning dial clockwise to ten- sion the chain.
NOTE: A cold chain is correctly tensioned when there is no slack on the underside of the guide bar, the chain is snug, and it can be turned by hand without binding.
nRetension the chain whenever the flats on the drive links hang out of the bar groove.
NOTE: During normal saw operation, the tem- perature of the chain increases. The drive links of a correctly tensioned warm chain will hang approximately .050 in. out of the bar groove. The tip of the supplied combination wrench (UT10546, UT10566 and UT10586 only) can be used as a guide to help determine the correct warm chain tension.
NOTE: New chains tend to stretch; check the chain tension frequently and tension as required.
Fig. 43
FLATS ON DRIVE LINKS
Fig. 44
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≈ .050 in. |
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| Fig. 45 | |
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| ≈ .050 in. | ||||
Fig. 46
CAUTION:
A chain tensioned while warm may be too tight upon cooling. Check the “cold tension” before next use to avoid possible injury.
Page 28 — English