Homelite UT21566, Operator'S Manual, Page: 14 / 22

Page 1
Fig. 10
SPOOL
RETAINER
MAINTENANCE
WARNING:
When servicing, use only identical Homelite replacement
parts. Use of any other parts may create a hazard or
cause product damage.
WARNING:
Always wear safety goggles or safety glasses with side
shields during tool operation. If operation is dusty, also
wear a dust mask.
WARNING:
Before inspecting, cleaning, or servicing the machine,
shut off engine, wait for all moving parts to stop, and
disconnect spark plug wire and move it away from spark
plug. Failure to follow these instructions can result in
serious personal injury or property damage.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercial solvents and may be damaged by their use. Use
clean cloths to remove dirt, dust, lubricant, grease, etc.
WARNING:
Do not at any time let brake fluids, gasoline, petroleum-
based products, penetrating lubricants, etc., come in con-
tact with plastic parts. Chemicals can damage, weaken or
destroy plastic which may result in serious personal
injury.
You can often make adjustments and repairs described here.
For other repairs, have the trimmer serviced by an authorized
service dealer.
SPOOL REPLACEMENT
EZ WIND
™
TAP ADVANCE SYSTEM
NEW PREWOUND SPOOL
See Figures 10 - 11.
If replacing string only, refer to String Replacement later
in this manual.
Use only .080 in. diameter trimmer line. Use original manu-
facturer’s replacement string for best performance.

Stop the engine and disconnect the spark plug wire. Hold
the string head and turn the spool retainer counterclock-
wise to remove.

Remove the empty spool from the string head. Keep the
spring attached to the spool.
 To install the new spool, make sure the two strings are
captured in the slots opposite each other on the new
spool. Make sure the end of each string is extended
approximately 6 in. beyond each slot.

Align the slots on the spool to the eyelets on the string
head housing. Push down and turn the spool in the nec-
essary direction to align the slots.
 Reinstall the spool retainer and turn clockwise to
secure.

Slide both strings into the housing eyelets and pull outward
to rotate the spool into the cutting position.
 Push the spool retainer down while pulling on strings
to manually advance the string and to check for proper
assembly of the string head.
STRING REPLACEMENT
See Figures 1 - 1.

Stop the engine and disconnect the spark plug wire. Hold
the string head and turn the spool retainer counterclock-
wise to remove.

Remove the spool from the string head.
NOTE: Keep the spring attached to the spool. Remove
any old string remaining on the spool.


Cut one piece of trimmer string 18 ft. long.
Fig. 11
INSERT INTO
STRING HEAD
PUSH DOwN
AND TwIST TO
ALIGN