MAINTENANCE AND INSPECTION

WARNING

To avoid an accident or personal injury, always confirm that the trigger switch is turned OFF and the power plug has been disconnected from the receptacle before performing any maintenance or inspection of this tool.

1.Inspecting the saw blade

Always replace the saw blade immediately upon the first sign of deterioration or damage.

A damaged saw blade can cause personal injury and a worn saw blade can cause ineffective operation and possible overload to the motor.

CAUTION

Never use a dull saw blade. When a saw blade is dull, its resistance to the hand pressure applied by the tool handle tends to increase, making it unsafe to operate the power tool.

2Inspecting the carbon brushes

For your continued safety and electrical shock protection, carbon brush inspection and replacement on this tool should ONLY be performed by a Hitachi

Authorized Service Center.

3.About Handling the Motor (see Fig. 1)

Winding of the motor is said to be the heart of this

tool. Exercise utmost caution not to damage the winding by exposing it to wash oil or water.

NOTE

Accumulation of dust and the like inside the motor can result in a malfunction.

After using the motor for 50 hours or so, carry out no- load running, and blow in the dry air from a wind hole at the motor's rear. Such action is effective to discharge dust and the like.

4.Inspecting the screws

Regularly inspect each component of the power tool for looseness.

Re-tighten screws on any loose part.

WARNING

To prevent personal injury, never operate the power tool if any components are loose.

5.Inspecting the lower guard for proper operation Before each use of the tool, test the lower guard (see Fig. 7) to assure that it is in good condition and that it moves smoothly.

Never use the tool unless the lower guard operates properly and it is in good mechanical condition.

6.Storage

After operation of the tool has been completed, check that the following has been performed:

(1)Trigger switch is in OFF position,

(2)Power plug has been removed from the receptacle, When the tool is not in use, keep it stored in a dry

place out of the reach of children.

7.Replacement of guard

After long-term use, the blade slot in the guard may widen and require replacement. If the blade slot should widen, replace the guard with a new one. After replacing, make a groove on it. Refer to “1. Cutting a groove on the guard” on page 8.

Guard

Fig. 56

8.Replacement of Poly-V-Belt

The power of the motor is transmitted to the saw blade by a Poly-V-Belt. When the Poly-V-Belt is broken or damaged, remove the belt cover by loosening the four 5 mm screws (see Fig. 2) and replace the damaged one with the new one.

When connecting the belt on pulleys, first connect 2 or 3 teeth of Poly-V-Belt to the grooves of the pulley

(A) and pulley (B). Then turning the pulley (A) and pulley (B), connect all 13 teeth of the belt to the pulleys.

Poly-V-belt

Pulley (A)

Pulley (B)

Fig. 57

9.Lubrication

Lubricate the following sliding surfaces once a month to keep the power tool in good operating condition

for a long time (see Fig. 1 and Fig. 2). Use of machine oil is recommended.

Oil supply points:

*Rotary portion of hinge

*Rotary portion of vise assembly

*Rotary portion of holder (A)

10.Cleaning

Periodically remove chips, dust and other waste material from the surface of the power tool, especially from the inside of the lower guard with a damp, soapy cloth. To avoid a malfunction of the motor, protect it from contact with oil or water.

If the laser line becomes invisible due to chips and the like adhered onto the window of the laser marker's light-emitting section, wipe and clean the window with a dry cloth or a soft cloth moistened with soapy water, etc.

11.Replacing supply cord

If the supply cord of Tool is damaged, the Tool must be returned to Hitachi Authorized Service Center for the cord to be replaced.

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