Hitachi G12VA, G13VA, G13YF MAINTENANCE AND INSPECTION, Fig, Fig, NOTE, 2.Inspecting the mounting screws, 1.Inspecting the depressed center wheel, 3.Inspecting the carbon brushes (Fig. 5)

Wrench
Wheel nut
	Diamond	Washer nut
		Radial grinding
Depressed	wheel	wheel
		Sanding
center wheel
		disc
		Rubber pad
Wheel
washer
Wheel
guard

Spindle

Push button

Fig. 4

MAINTENANCE AND INSPECTION

1.Inspecting the depressed center wheel

Ensure that the depressed center wheel is free of cracks and surface defects.

2.Inspecting the mounting screws

Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loose, retighten them immediately. Failure to do so could result in serious hazard.

3.Inspecting the carbon brushes (Fig. 5)

The Motor employs carbon brushes which are consumable parts. When they become worn to or near the “wear limit”, it could result in motor trouble. When an auto-stop carbon brush is equipped, the motor will stop automatically. At that time, replace both carbon brushes with new ones which have the same carbon brush Numbers shown in the figure. In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.

Wear limit

4.Replacing carbon brushes (Fig. 6) <Disassembly>

(1) Loosen the D4 tapping screw retaining the tail cover and remove the tail cover.

(2) Use the auxiliary hexagonal wrench or small screwdriver to pull up the edge of the spring that is holding down the carbon brush. Remove the edge of the spring toward the outside of the brush holder.

(3) Remove the end of the pig-tail on the carbon brush from the terminal section of brush holder and then remove the carbon brush from the brush holder.

<Assembly>

(1) Insert the end of the pig-tail of the carbon brush in the terminal section of brush holder.

(2) Insert the carbon brush in the brush holder.

(3) Use the auxiliary hexagonal wrench or small screwdriver to return the edge of the spring to the head of the carbon brush.

NOTE

Make sure the end of the spring is not holding the pig-tail.

(4) Mount the tail cover and tighten the D4 tapping screw.

			No. of carbon brush
		6 mm
	17 mm
			No. of carbon brush
Usual carbon brush			88
Auto-stop carbon brush			76
		Fig. 5

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