Bedienungsanleitung Hitachi WF4H2 (Seite 12 von 72) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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7. Mode switching feature (Fig. 17)

The screw driver has a mechanism for switching modes,

allowing it to output pressure in two steps to suit the

conditions with diﬀ erent materials. The Normal mode has

little recoil, so works well when the ﬁ nish is important,

while the Power mode is for jobs that require powerful

tightening.

○: can be used

×: cannot be used

Application Normal Mode Power Mode

Gypsum board + wood studs

Plywood + wood studs

○○

Steel studs

(Thickness)

0.4 mm or less

○

0.4 – 0.6 mm ○○

0.6 – 0.8 mm

○

NOTE

○ Disconnect the air hose before switching modes.

○ Clean and oil the area around the mode lever periodically.

○ We recommend using the Normal mode with steel studs

if possible and using the Power mode if screws are not

penetrating far enough.

Take particular note that the Power mode cannot be used

with 0.4 mm steel studs. Always use the Normal mode.

Screws may pierce too far and strip out the metal or they

may not hold the material.

○ When using the Normal mode, if the materials are too

hard and screws are not getting tight, switch to the Power

mode.

○ When driving screws into plywood in the Power mode,

hold the body of the driver ﬁ rmly with both hands to keep

it from shaking. (Fig. 18)

If the driver vibrates, the bit may lose contact with the

screw and fail to tighten it.

○ When starting work in the Normal mode, the driver may

not start properly on the ﬁ rst try. If this happens, switch

the mode lever to Power mode temporarily and after two

or three screws, switch back to the Normal mode and use

it.

○ When in the normal mode, the pressure inside the high-

pressure screw driver is essentially the same all the time,

regardless of the pressure on the air compressor side.

Consequently, even if the pressure on the air compressor

side is raised, the pressure inside the driver does not

change.

○ The screw driver may not perform well when used in the

cold.

8. Relief valve (Fig. 19)

The relief valve is a mechanism that functions when the

pressure inside the driver exceeds 10 bar, expelling air out

of the exhaust port and decreasing the pressure inside the

driver.

The relief valve is inside the exhaust port.

When using the high pressure screw driver, if the relief valve

should operate and leak air, take the following steps to stop

the leak.

(If the air leak does not stop on the ﬁ rst try, repeat steps 1

to 3 several times.)

1 Immediately disconnect the air hose.

2 Wait until the air compressor's pressure returns to 17.6

bar or more.

3 Reconnect the air hose.

CAUTION

○ Put the dust cap on the air plug when not using the screw

driver or during breaks from work.

If dirt or dust from drywall gets into the screw driver via

the air plug, it may reduce the ability of the high-pressure

reducing valve to seal.

○ When not in use or during breaks from work, always

disconnect the air hose.

If you leave the air hose connected when the ability of the

high-pressure reducing valve is compromised, over time

air will leak little by little from the air hose (high pressure)

into the screw driver, raising the pressure inside it, which

may cause the relief valve to actuate.

○ Make a habit of draining the water inside the air

compressor.

If foreign matter such as rust in the drain gets inside the

high-pressure reducing valve, it will reduce its ability to

seal.

The high-pressure screw driver is equipped with a high-

pressure reducing valve that reduces the pressure from

the high pressure air hose side at 17.6 to 22.6 bar to a

normal pressure (about 8.2 bar). If debris gets inside this

high-pressure reducing valve, it reduces its ability to seal

properly and in such a state, if an air hose is left attached

for a long time, the pressure inside the screw driver will

rise gradually. This will eventually actuate the relief valve,

allowing air to leak violently from the exhaust port.

REPLACING THE BIT

If the bit starts losing contact with the screw frequently during

fastening, (bit fails to engage with the head of the screw,

spins out and fails to tighten the screw) it is time to change

the bit. Replace with a new part as soon as possible.

Use the bit changing tool that comes with the driver and

replace the bit as follows.

CAUTION

Always disconnect the air hose and unload all the screws

when changing the bit.

NOTE

○ Make sure no powder, dust or debris gets inside the

screw driver while changing the bit.

Such foreign matter can damage the screw driver.

○ Bits are consumable parts. If you continue to use a

worn bit, it may become impossible to replace it due

to damage to the bit's cross or to internal parts. At the

same time, work eﬃ ciency suﬀ ers and screws fail to be

fastened properly. Replace worn bits with new ones as

soon as possible.

1. Removing the bit

(1) Disconnect the air hose.

CAUTION

The bit cannot be replaced unless the air hose is

disconnected.

(2) Open the screw guide.

Open the vertical guide, insert the tip of the bit changing

tool in the muzzle and align it to the cross on the tip of the

bit. (Fig. 20)

(3) While pressing the bit changing tool against the bit, turn it

counterclockwise about 10 turns until the bit is detached

from inside the screw driver. (Fig. 21)

(4) Take the bit changing tool out, lower the muzzle, open

the vertical guide and the bit can be removed. (Fig. 22)

01Eng_WF4H2_WE.indd 1201Eng_WF4H2_WE.indd 12 2012/04/18 14:36:192012/04/18 14:36:19

Hitachi WF4H2 Seite 12

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