Ryobi Expand-it UT15520C - Manual (Page 13)

13
MAINTENANCE
CHAIN TENSION
See Figures 17 - 18.

Stop the engine before setting the chain tension. Make
sure the guide bar nut is loose to finger tight, turn the
chain tensioning screw clockwise to tension the chain.
Refer to
Replacing the Bar and Chain for additional
information.
A cold chain is correctly tensioned when there is no slack
on the underside of the guide bar and the chain is snug,
but can be turned by hand without binding.
 The chain must be re-tensioned whenever the flats on
the drive links hang out of the bar groove.
 During normal operation, the temperature of the chain will
increase. The drive links of a correctly tensioned warm
chain will hang approximately .050 in. (1.25 mm) out of
the bar groove.
NOTE: New chains tend to stretch; check chain tension
frequently and tension as required.
CAUTION:
A chain tensioned while warm may be too tight upon
cooling. Check the “cold tension” before next use.
CHAIN OILER
See Figure 19.

Use Premium Bar and Chain Oil. It is designed for chains
and chain oilers and is formulated to perform over a wide
temperature range with no dilution required.
 Remove the cap and carefully pour approximately 8 oz.
of the bar and chain oil into the chain oiler tank.
 Replace the cap and tighten securely.
 Check and refill the chain oiler tank every time the engine
is fueled.
NOTE: Do not use dirty, used, or otherwise contaminated
oils. Damage may occur to the oil pump, bar, or chain.
FLATS
Fig. 18
Fig. 17
APPROX .050 IN. (1.25 mm)
Fig. 19
REMOVE
CAP
REPLACE
CAP
CHAIN OILER TANK