Inspection And Maintenance - Hitachi WF 4H2 Handling Instructions Manual

2. Installing a bit
(1) Open the screw guide.
Apply a small amount of the supplied oil to the threads
of the bit, open the vertical guide and insert the new bit
inside the muzzle. (Fig. 23)
(2) 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. 24)
(3) While pressing on the bit changing tool, turn it clockwise
and tighten the bit. (Not much force is needed to tighten
it.) (Fig. 25)
NOTE
If the bit's threads have rust on them, the next time the bit
is changed, it may be diffi cult to remove it from the screw
driver. When changing the bit, be absolutely sure to apply
some of the supplied oil to the threads before replacing
the bit.
USING THE STABILITY GUIDE
(OPTIONAL ACCESSORY)
CAUTION
○ When removing or mounting the stability guide, be sure
to take your fi nger off the trigger and disconnect the air
hose.
○ Point the muzzle downwards and make sure it is away
from any body parts, such as hands or feet.
The stability guide (optional accessory) is attached to the
bottom of the magazine to suppress vibration of the tool's
body and to stabilize it while driving screws. When it is
not needed, it can be removed easily. (Fig. 26, 27)

INSPECTION AND MAINTENANCE

CAUTION
Always be sure to disconnect the air hose and unload all
the screws when clearing jams and during inspection and
maintenance.
1. Clearing Jams
(1) Take all of the screws out of the magazine, open the
screw guide, insert a slender rod through the muzzle and
tap on it with a hammer. (Fig. 28)
(2) Use a slotted screw driver to remove the screw(s)
jammed inside. (Fig. 29)
(3) Cut out the part of the collated sheet that is deformed with
nippers or the like and set the screws back in the screw
driver.
2. Inspecting the screw Feeder
○ Clean the moving parts of the knob occasionally and
apply some of the supplied oil. (Fig. 30)
○ Remove the cover, open the screw guide and clean off
any debris or drywall dust sticking to it. Be particularly
sure to oil the sliding parts of the feeder, namely the
groove and shaft. (Fig. 31)
○ After cleaning the screw feeding surface of the tail cover
as well, apply a thin coat of the supplied oil. Applying oil
makes the mechanisms move smoothly while preventing
rust at the same time. (Fig. 32)
3. Check on mounting screws for each part
At regular intervals check every part for loose mounting
screws and whether or not there are any air leaks.
Retighten any loose screws. Operating the equipment
with loose screws untightened will incur a hazard.
4. Inspecting the push lever
Check if the push lever can slide smoothly (Fig. 1).
Clean up the sliding area of the push lever and use the
provided oil for lubrication from time to time. Lubrication
enables smooth sliding and simultaneously serves to
prevent the formation of rust.
5. Inspect the trigger
Periodically clean the sliding parts of the trigger, and
make sure that the trigger moves smoothly (Fig. 1).
6. Inspecting the magazine
Clean the magazine. Remove dust of gypsum board and
dust of wooden chips which may have accumulated in
the magazine.
7. Preventing dirt and dust
When not in use, put the dust cap on the air plug to
prevent any debris from getting inside the screw driver.
8. Storing
CAUTION
After work, remove all the screws from the screw driver.
NOTE
When putting the dust cap on the air plug, fi rst turn the
screw driver upside down and give it time to drain any
water out completely and then put the cap on.
○ After work, put the dust cap on the air plug to keep any
dirt or dust from getting inside the screw driver and then
store it in its case.
○ If it will not be used for a long time:
• To prevent rust, oil it via the air plug and then dry fi re
it two or three times to spread the oil throughout the
screw driver.
• Apply a thin coat of oil to steel parts and to valves.
• Use the supplied oil for oiling the screw driver. Avoid
mixing diff erent types of oil.
○ If the temperature drops, rubber parts may shrink and
allow air to leak, so it may not perform well when starting
to use it again; therefore, store it in a warm place.
○ Store in a dry place where children cannot reach it.
9. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized Service
Center.
This Parts List will be helpful if presented with the tool to
the Hitachi Authorized Service Center when requesting
repair or other maintenance.
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
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