Ryobi Expand-it UT15520C - Manual (Page 14)

14
MAINTENANCE
CUTTING CORNER
SIDE PLATE
DEPTH GAUGE
TOE
GULLET
HEEL
RIVET HOLE
TOP PLATE
PARTS OF A CUTTER
Fig. 21
Fig. 22
DEPTH GAUGE SETTING
Fig. 20
Fig. 23
CHAIN MAINTENANCE
See Figure 20.
WARNING:
The chain is very sharp; always wear protective gloves
when performing maintenance to the chain.
Use only the replacement low kickback chain specified for
this unit.
For smooth and fast cutting, the chain needs to be maintained
properly. The chain requires sharpening when the wood chips
are small and powdery, the chain must be forced through the
wood during cutting, or the chain cuts to one side. During
maintenance of the chain, consider the following:

Improper filing angle of the side plate can increase the
risk of a severe kickback.
� Depth gauge (or raker clearance) setting determines the
height the cutter enters the wood and the size of the wood
chip that is removed. Too much clearance increases the
potential for kickback. Too little clearance decreases the
size of the wood chip thus decreasing the chain’s cutting
ability.
 If cutter teeth have hit hard objects such as nails and
stones, or have been abraded by mud or sand on the
wood, have service dealer sharpen chain.
HOW TO SHARPEN THE CUTTERS
See Figures 21 - 24.
WARNING:
Improper chain sharpening increases the potential of
kickback. Failure to replace or repair damaged chain can
cause serious injury.
Be careful to file all cutters to the specified angles and to
the same length, as fast cutting can be obtained only when
all cutters are uniform.

Tighten the chain tension enough that the chain does not
wobble. Do all of your filing at the mid-point of the bar.
Wear gloves for protection.
 Use a 5/32 in. diameter round file and holder.
 Keep the file level with the top plate of the tooth. Do not
let the file dip or rock.
 Using light but firm pressure, stroke towards the front
corner of the tooth. Lift file away from the steel on each
return stroke.
 Put a few firm strokes on every tooth. File all left hand
cutters in one direction. Then move to the other side and
file the right hand cutters in the opposite direction. Occa-
sionally remove filings from the file with a wire brush.
Fig. 24
LEFT HAND
CUTTERS
RIGHT HAND
CUTTERS