Cutter Blade Adjustment

WARNING!

The cutter blades are very sharp! Always wear gloves when working around the cutter assembly.

CAUTION!

Operating the trimmer with worn or improperly adjusted cutters will reduce cutter performance and may also damage your unit.

Cutter performance of your unit depends in great measure on cutter blade clearance. Properly adjusted blades will oscillate freely yet help prevent binding of cut material between blades. Adjust blades as follows (Figure 32):

1.Loosen all blade locknuts at least one full turn.

2.Tighten each blade shoulder bolt firmly, and then loosen the shoul- der 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.

Locknut

Guide Bar

Powerhead Installation

Spark

Plug

Main

Shaft

Outer Tube

Grip

Ignition

Switch

Tube

Clamp

Clamp Screw

Throttle Lever

Figure 5

Connect the Outer Tube to the Powerhead.

ASSEMBLY

Cutter Blades	Washer
Shoulder	(should turn
Bolt	freely)
Figure 32

1.Place the powerhead on a clean, flat surface, spark plug facing up.

2.Use the 4mm hex wrench to loosen

Tube Clamp

Hex

Wrench

3.	Add some moly-type EP grease to
	splines at the end of the main shaft.
4.	Slide the outer tube into the tube
	clamp until the tube bottoms. If
	installation is difficult, rotate the
	outer tube or main shaft slightly
	until you feel the mainshaft splines
	engage with the powerhead.
	See Figure 5.
5.	Position the outer tube so that the
	ignition switch is facing up and the
	throttle lever is facing down.

MAINTENANCE

Shim Washer

Figure 6

the tube clamp screw. Verify that the D-shaped shim washer is positioned as shown in Figure 6.

CAUTION!

Do not remove the D-shaped shim washer! The shim washer pre- vents damage from overtightening the tube clamp screw.

	See Figure 5.
6.	Slide the outer tube into the
	powerhead until the throttle grip
	just contacts the tube clamp.
7. Tighten the clamp screw firmly.

CAUTION!

Do not force the shaft tube into the powerhead! Excessive force can damage the shaft tube and mainshaft.

AH231, 63848-94010 specifications

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