InFocus VR 9DM2 Maintenance and Inspection, Inspecting the driver bit WH12DM2, WH9DM2, WH12DMR

English

Bolt

Nut

For WR12DM2

Tightening torque

*The following bolt is used.

Steel plate thickness tOrdinary bolt: Strength grade 4.8 High tensile bolt: Strength grade 12.9

(	Explanation of strength grade:		)
	4	— Yield point of bolt: 32 kgf/mm2
	8	— Pulling strength of bolt: 40 kgf/mm2

Fig. 27

kgf·cm	N·m		M16 ⋅ 55 F10T (tighening time 3 sec)
2000	200							a
1600	160
1200	120		When full recharged
				When completely
800	80			discharged
400	40
0	0	0	20	40	60	80	100	120	140

Number of tightenings (PCS)/charging

Fig. 28

For WR9DM2

	kgf·cm	N·m		M14 ⋅ 50 High tension bolt
				(tighening time 3 sec)
torque	1600	160						a
	1200	120
Tightening	800	80	When full recharged
	400	40		When completely
				discharged
	0	0			60	80	100	120	140	160
		0	20	40

Number of tightenings (PCS)/charging

Fig. 29

MAINTENANCE AND INSPECTION

1.Inspecting the driver bit (WH12DM2, WH9DM2, WH12DMR)

Using a broken bit or one with a worn out tip is dangerous because the bit can slip. Replace it.

2.Inspecting the socket (WR12DM2, WR9DM2)

A worn or deformed hex. or a square-holed socket will not give an adequate tightness to the fitting between the nut or anvil, consequently resulting in loss of tightening torque. Pay attention to wear of a socket holes periodically, and replace with a new one if needed.

3.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 may result in serious hazard.

4.Maintenance of the motor

The motor unit winding is the very “heart” of the power tool.

Exercise due care to ensure the winding does not become damaged and/or wet with oil or water.

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