Tightening Torque Inspection Prior To Operation; Tightening Torque Variation - Hitachi WH 12DH Technical Data And Service Manual

(2) The following cautions are listed on the Name Plate attached to each Type EB 12B or EB 12H Storage battery:
For Europe
CAUTION
before use.
For the U.S.A.
CAUTION
(3) The following caution is listed on the Name Plate attached to the Model UC 14YF or UC 14YF2 Charger.
For the U.S.A.
CAUTION
For safe operation, see Instruction Manual.
Charger HITACHI rechargeable batteries Type EB 7, EB 9,
EB 12 and EB 14 series. Other types of batteries may burst
causing personal injury and damage.
Charge between 32 and 104 F.
Indoor use only.
Replace defective cord immediately.

8-2. Tightening Torque Inspection Prior to Operation

As described and shown in Para. 7-3-3, the output tightening torque of which the Models WH 12DH and
WR 12DH are capable in excess of the rated tightening torque of certain bolts and screws. Accordingly, if the
tightening time is prolonged for such bolts and screws, it could cause damage to their threads or, in the worst
case, cause them to be sheared off. (This phenomenon is common to all existing impact drivers.) Particularly
when tightening M6 (1/4") or smaller screws, tightening time must be kept extremely short: 0.5 seconds or less.
The customer should be advised to carry out several screw tightening operations and adjust the tightening time as
necessary by measuring the tightening torque with an appropriate torque wrench or driver before commencing
continuous operation

8-3. Tightening Torque Variation

The tightening torque of the cordless impact driver or wrench may vary slightly in accordance with the factors
described below. Salespersons are requested to advise the customer to confirm that appropriate tightening
torque is obtained by measuring the torque with an appropriate torque wrench or torque driver at the beginning of
the tightening operations, and as necessary during the tightening operations. In addition, the torque values
shown in Para. 7-3-2 above are useful as a handy reference, and may be utilized as tentative standards.
Read thoroughly HANDLING INSTRUCTIONS
Do not disassemble nor throw into fire.
For safe operation, see Instruction Manual.
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