Manual Hitachi w 8 vb (page 7 of 30) (English)

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4. Confirm the direction of bit rotation (Fig.1)

The bit rotates clockwise (viewed from the rear

side) when the reversing switch lever is set to the

“R” side position. When the lever is set to the “L”

side position, the bit rotates counterclockwise and

can be used to loosen and remove screws.

5. Adjusting the tightening depth (Fig.2)

Pull the lock sleeve in the direction of arrow to

remove it from the spline installed in the gear

cover. While pulling the lock sleeve and turning it

right and left, adjust the position of locator. Push

the lock sleeve and align the gear cover spline with

the lock sleeve spline.

The lock sleeve can be inserted onto the gear cover

spline and locked.

(1) For hex-head screws:

Mount a hex-head screw on the hex-socket and set

the distance between the sub-stopper end and the

screw head neck to 1–1.5 mm, as shown in Fig.3.

(2) For drywall screws:

Mount a drywall screw on the bit, and set the

distance between the sub-stopper end and the screw

head to 1.5–2 mm, as shown in Fig.4.

(3) For cross-recessed self-drilling screws:

Mount a self-drilling screw on the bit, and set the

distance between the sub-stopper end and the screw

head bottom to 1–1.5 mm, as shown in Fig.5.

6. Mounting the bit

For details, refer to the item “Mounting and

dismounting the bit”.

MOUNTING AND DISMOUNTING THE HEX-

SOCKET OR THE BIT

1. Dismounting the hex-socket (Fig.6)

(1) While rotating the Sub-Stopper pull it out from the

locator.

(2) Remove the hex-socket, hold it with the opposite

side of bit by hand or vise and pull out the bit with

pliers.

2. Dismounting the bit (Fig.7)

Remove sub-stopper (A) as the same manner of

hex-head socket and remove the bit holder, then

pull out the bit with pliers.

3. Dismounting the bit (Fig.8)

Remove the sub-stopper (C) as the same manner

of hex-head socket and remove the bit holder, then

pull out the bit with pliers.

4. Mounting the hex-socket or the bit

Install the bit in the reverse order to removal.

HOW TO USE THE SCREW DRIVER

1. Switch operation and rotational speed

adjustment

Bit rotational speed can be adjusted between 0–

4000/min (W6V3) or 0–2600/min (W6VA3, W6VB2)

or 0–1700/min (W8VB) varying the degree by which

the trigger switch is pulled. Rotational speed

increases as the trigger switch is pulled, and reaches

a maximum speed of 4000/min (W6V3) or 2600/min

(W6VA3, W6VB2) or 1700/min (W8VB) when the

trigger switch is pulled fully.

To facilitate continuous operation, pull the trigger

switch and depress the switch stopper. The switch

will then remain ON even when the finger is released.

By pulling the trigger switch again, the switch

stopper disengages and the switch is turned OFF

when the trigger switch is released.

2. Screw Driver operation

When the switch is turned ON, the motor starts to

run but the hex-socket (or the bit) does not rotate.

Attach the hex-socket to the screw head groove,

and push the Screw Driver against the screw. The

hex-socket then rotates and tightens the screw.

CAUTION

Ensure that the Screw Driver is held truly

perpendicular to the head of the screw.

If held at an angle, the driving force will not be

fully transferred to the screw, and the screw head

and/or hex-socket will be damaged. Hex-socket

rotation stops when pushing force is released.

3. Direction of hex-socket rotation

The hex-socket rotates clockwise (viewed from the

rear side) when the reversing switch lever is set

to the “R” side position. When the lever is set to

the “L” side position, the hex-socket rotates counter-

clockwise, and can be used to loosen and remove

screws.

CAUTION

Never change the direction of hex-socket (or bit

holder) rotation while the motor is running. To do

so would seriously damage the motor. Turn the

power switch OFF before changing the direction

of hex-socket (or bit holder) rotation.

MAINTENANCE AND INSPECTION

1. Inspecting the hex-socket (or bit)

Since continued use of a worn hex-socket (bit) will

damage screw heads, replace the hexsocket (bit)

with a new one as soon as excessive wear is

noticed.

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. 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.

4. Inspecting the carbon brushes (Fig.9)

The motor employs carbon brushes which are

consumable parts. Since an excessively worn carbon

brush can result in motor trouble, replace the carbon

brushes with new ones having the same carbon

brush No. shown in the figure when they become

worn to or near the “wear limit”. In addition, always

keep carbon brushes clean and ensure that they

slide freely within the brush holders.

5. Replacing carbon brushes (Fig.10)

Disassembly:

(1) Loosen the three screws, and remove the handle

cover.

(2) Lift the brush holder gently with a screwdriver or

the like, and remove it from the housing while

depressing the carbon brush, as shown in Fig.9. Be

careful not to excessively pull the lead wire.

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Hitachi w 8 vb Manual

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