Ryobi AC053N1BFH Manual page 2

For units with arbors:
 Install the spacer onto the upper housing.
 Slide the spacer and upper housing onto the arbor.
NOTE: The arbor will perforate the label on the bottom of the lower
housing. This will allow the arbor to insert through the unit.
NOTICE:
Make sure the arbor is fully seated into the hex-shaped pocket on
the spacer before proceeding. An arbor that is not fully seated will
cause damage to the upper housing and spacer.
 Place the spring into the upper housing and push down to seat.
 Install the white line guide into the spool.
NOTE: When installing, align the keys located on the underside of the
guide with the corresponding holes in the spool.
 Insert the spool into the upper housing and onto the arbor.
 Secure the spool in place by pressing it firmly into the upper housing
and installing a bolt (M8) into the opening in the arbor.
For curved shaft models, install the black bolt and turn clockwise. Make
sure bolt is fully screwed into arbor. Do not overtighten.
For straight shaft models, install the silver bolt and turn counterclockwise.
Make sure bolt is fully screwed into arbor. Do not overtighten.
 Align the ribs on the knob with the slots in the spool and place the knob
onto the spool.
 Slide lower housing over the knob and onto the upper housing. Push
together until the arrows in the upper housing align to the arrows in the
lower housing. Push and turn clockwise to the locked position.
 Install line as described in Installing Line.
For units without arbors:
 Insert nut (M8), with flange facing down, into the hex pocket in the upper
housing then twist upper housing onto the attachment (see figure 6).
For curved shaft models, insert silver nut and turn upper housing
clockwise.
For straight shaft models, insert black nut and turn upper housing
counterclockwise. If necessary, use a wrench (not provided) or locking
pin to hold the flange washer while tightening the upper housing.
 Place the spring into the upper housing and push down to seat.
 Install the black line guide into the spool.
NOTE: When installing, align the keys located on the underside of the
guide with the corresponding holes in the spool.
 Align the ribs on the knob with the slots in the spool and place the knob
onto the spool.
 Insert the bump knob and spool assembly through the opening in the
lower housing.
 Slide lower housing onto the upper housing. Push together until the arrows
in the upper housing align to the arrows in the lower housing. Push and
turn clockwise to the locked position.
 Install line as described in Installing Line.
INSTALLING LINE
See Figure 7.
The trimmer head comes with 16 ft. of .095 in. trimmer line. Look
for replacement line where you purchased this product. Use original
manufacturer's .095 in. replacement line for best performance.
 Stop the engine or motor, disconnect the spark plug wire for gas power
heads, remove the battery pack for cordless power heads, or disconnect
the plug from the power source for electric power heads.
 Rotate the bump knob clockwise as necessary to align the arrows on
the bump knob with the arrows on the trimmer head housing.
 Insert the trimmer line into the eyelet on the trimmer head housing. Push
until the end of the line comes out the other side of the housing. Pull the
line until equal amounts of line appear on both sides of the housing.
NOTE: If replacing trimmer line, do not insert more than 16 ft. of line.
Line may jam if more than 16 ft. is loaded.
 Either by hand or using the SPEED WINDER
clockwise to wind the line on the spool until approximately 6 in. of line
is showing on each side.
NOTE: After every five to seven revolutions of the SPEED WINDER, pull
both line ends taut for best loading results and to help prevent line from
tangling.
 Push the bump knob down while pulling on line(s) to manually advance
the line.
, rotate the bump knob
™
CURVED SHAFT
ARBOR
SPACER
UPPER
HOUSING
SPRING
WHITE
LINE GUIDE
SPOOL
BLACK
BOLT
KNOB
LOWER
HOUSING
CURVED SHAFT
UPPER
LOCKING
HOUSING
SILVER
NUT
SPRING
BLACK
LINE GUIDE
SPOOL
KNOB
LOWER
HOUSING
ARROWS
LINE
EYELET
STRAIGHT SHAFT
ARBOR
SPACER
HOUSING
SPRING
LINE GUIDE
SPOOL
SILVER
BOLT
KNOB
HOUSING
STRAIGHT SHAFT
FLANGE
WASHER
PIN
BLACK
LINE GUIDE
SPOOL
SPEED
WINDER
™
LINE
UPPER
WHITE
LOWER
Fig. 5
UPPER
HOUSING
NUT
SPRING
BLACK
KNOB
LOWER
HOUSING
Fig. 6
KNOB
Fig. 7