Operational Cautions - Hitachi WH 8D2 Instruction Manual And Safety Instructions

4. Number of bolt tightenings possible (with one charge)
Please refer to the table below for the number of bolt tightenings possible with
one charge.
3/8'' (M10) High
As shown above, the longer tightening time is, the fewer the number of tightenings,
and the shorter the time is, the greater the number of tightenings possible. These
values may vary slightly, according to surrounding temperature and battery charac-
teristics.

OPERATIONAL CAUTIONS

1. After continuous work, allow the unit to rest
When you replace the batteries after continuously using the unit to tighten bolts,
let the unit rest for about 15 minutes.
If you continue using the unit immediately after replacing the batteries, the motor
and switch etc. may become very hot, and may burn out.
2. Tightening torque
Refer to Fig. 14, 15, 16 and 17 for the tightening torque of bolts (according to size),
under the conditions shown in Fig. 18.
Please use this example as a general reference, as tightening torque will vary
according to tightening conditions.
!
CAUTION
If a long tightening time is used when tightening small diameter 3/16" (M5) or
1/4" (M6) bolts or small screws, there is a danger of the bolt or screw breaking,
so please confirm the tightening time and the tightening torque befoehand.
*Bolt used
tensile bolt
Tightening
time
1 sec Approx. 220
*Use hexagonal socket
No. of
tightenings
21