Instruction manual

ManualsBrandsArbortech ManualsPower ToolsAS160

M

ALLS

™

160

7.5 Top Handle and Rubber Bushes

It is recommended that the rubber shock isolation bushes on the top

handle be regularly checked visually (by viewing down into the sides of the

handle) and by "feel" to verify that the bushes are not damaged or worn

significantly. Excessive movement of the handle may indicate damaged

rubber bushes. If replacement of either the bushes or handle is necessary:

1. remove retaining rings holding the handle pin using a circlip remover.

2. push pins from the aluminium housing.

3. remove handle and rubber bushes.

4. replace rubber bushes and reassemble in reverse order.

Fig.17

Circlip

Bushes

7.6 Tooth Sharpness

The blades should be regularly inspected for fatigue cracks in the area near the mounting plate of the blade and

on the blade frame (see Fig. 18). This usually occurs near the end of the design life of the blades and the blades

should then be replaced.

With use, the blades will become dull and the cutting performance will decrease. This can be largely restored by

re-sharpening the teeth. Refer to Fig. 19 for correct tooth grinding profiles, noting that the tungsten-carbide

tipped blades require a diamond tool for sharpening.

The teeth are designed with a slight side clearance. Do not use blades once the side clearance has worn away.

Using blades with worn side clearance will cause excessive heat build up and may overload the motor & belt.

Occasionally, if very hard materials are cut, or the teeth impact a hard surface at an odd angle, teeth may become

chipped or broken. The blades can still be used, but cutting performance will be reduced.

If "blueing" of the blade periphery occurs, the blades are running too hot. This is usually due to the teeth being

worn, but can also be due to too much force being used, insufficient "sweeping" motion by the operator, or

material being too hard.

NOTE:

GRIND BACK

FACE ONLY

BACK FACE ANGLE

Fig.19

END VIEW OF TEETH

END VIEW

SIDE

CLEARANCE

WORN

Fatigue fracture

Fig.18

Tungsten Carbide Sharpening Instructions:

Using a diamond file or fine grade diamond disc, grind the tungsten carbide teeth to the angles shown in the

diagrams below. Grind the back tooth face only until both surfaces of the tooth create a definite sharp point.

Note that the teeth orientations alternately point inside and outside.

AS160

IMPORTANT

To ensure optimal

performance and reduce

load on motor, Blades

should be kept sharp