Grease Replacement; O-Ring Replacement - Hitachi H 30PV Technical Data And Service Manual

For the U.S.A. and Canada
For Taiwan

7-3. Grease Replacement

The striking portion and the speed reduction portion of the Model H 30PV respectively use different types of
grease. Grease replacement is required if the unit is disassembled for maintenance or O-rings become damaged
or worn as described in 7-4.
The striking portion uses special grease. If the striking portion (inside the cylinder case and crank case) is
disassembled, thoroughly remove all of the old grease from each part. On reassembly, insert 40 g (1.4 oz) of new
grease into the crank case (connecting rod side). Do not exceed the designated amount of grease. Excessive
grease insertion may cause reduced striking performance.
The speed reduction portion (inside the gear cover) uses Hitachi Motor Grease No. 29 (Code No. 930035).
The proper supply volume is 50 g (1.8 oz). Never use the striking portion special grease in the speed reduction
portion. Special grease would leak into the motor portion and cause subsequent trouble.

7-4. O-Ring Replacement

The O-rings (mounted on the striker and piston) are extremely important to ensure adequate sealing of the air
pressure. Although the O-rings are made of special rubber to give them a long service life, they do nonetheless
become worn, and should be replaced by new ones periodically depending on frequency of use of the tool. With
average use, it is recommended that the O-rings be replaced at least every six months to ensure maximum
effectiveness.
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