Shindaiwa AH243S Operator's Manual page 27

T: Idle speed adjustment screw
Cutter blade adjustment
1. Guide bar
2. Locknut
3. Cutter blades
4. Shoulder bolt
5. Washer
Maintenance and care
Every unit is test run at the factory and the carburettor is fine
tuned for maximum performance.
Before adjusting carburettor, clean or replace air filter, start en-
gine and run several minutes to bring it to operating temperature.
The engine must return to idle speed whenever the throttle lever
is released. Idle speed is adjustable, and must be set low enough
to permit the engine clutch to disengage the cutting attachment.
To adjust the carburettor proceed as follow:
1. Place the unit on the ground, then start the engine, and then
allow it to idle 2-3 minutes until warm.
2. If the attachment moves when the engine is at idle, reduce
the idle speed by turning the idle adjustment screw(T) coun-
ter-clockwise.
3. If a tachometer is available, the engine idle speed should be
final adjusted to 3000 (±500) rpm (min
NOTE
When the carburettor cannot be adjusted properly with the idle
speed adjustment screw (T), you must contact an authorized
service dealer.
The cutter blades are very sharp. Always wear gloves
when working around the cutter assembly.
Failure to observe the precautions could cause an accident
or injury, or even lead to a fatality.
Cutting performance of your machine depends a great deal on
proper cutter blade adjustment. Properly adjusted blades will os-
cillate freely yet help prevent binding of cut material between
blades. Adjust blades as follows:
1. Loosen all blade locknuts at least one full turn.
2. Tighten each blade shoulder bolt firmly, and then loosen the
shoulder bolts 1/4 to 1/2 turn.
3. Working from the gearcase end, lock each bolt in place by
firmly tightening its locknut while preventing the shoulder
bolt from turning.
When shoulder bolt adjustment is correct, there should be a gap
of 0.25–0.50 mm between the cutter blades and the flat washers,
and the flat washer beneath each bolt head should turn freely.
Operating the trimmer with worn or improperly adjusted
cutters will reduce cutter performance and may also
damage your machine. Never operate the machine with
damaged or worn cutters.
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WARNING
CAUTION