Hitachi DV 18DD Service Manual page 5

18 v cordless impact driver drill
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2. Reassembly of housing (A).(B) set
(1) Mount the reassembled power supply unit and Gear Box (C) [3] in housing (A).
(2) Check that the protrusion of the direction selector lever of the DC-speed control switch is correctly put in
the hole of the Pushing Button [7].
(3) Mount the shift arm to the groove of the Shift Knob [9] positioning the "HIGH" marking on the Shift Knob
[9] at the rear.
(4) Mount housing (B) to housing (A) and fasten it with the eight Tapping Screws (W/Flange) D3 x 16 [4].
(5) After completing reassembly up to step (4), check that each marking on the mode-switching dial
(screw-tightening mark "
on Housing (A).(B) Set [11], and the mode-switching dial rotates regularly. Also check that the clutch
dial rotates regularly. If the mode is not switched properly or the mode-switching dial or the clutch dial
does not rotate regularly, the dial may be improperly mounted. Mount the dial correctly. Check the
operation of the Shift Knob [9]. Switch the Shift Knob [9] and make sure the speed is correctly switched
between HIGH and LOW. If the speed change is disabled or abnormal, the Shift Knob [9] or other parts
may not be properly mounted. Mount the Shift Knob [9] or other parts correctly. Align the
mode-switching dial to the hammer mark "
the trigger switch to check for proper hammering.
3. Mounting the drill chuck
(1) Mount the Drill Chuck [2] to the spindle and fasten it with the Left-Hand Hexalobular M5 [1].
NOTE: The tightening torque of the Drill Chuck [2] is 29.4±2 N•m {300±20 kgf•cm}. It is higher
than that of the conventional models. Securely tighten the Drill Chuck [2] at 29.4±2 N•m
{300±20 kgf•cm}. If the Drill Chuck [2] is tightened at lower torque, the Drill Chuck [2] may
be loose.
," drill mark "
," and hammer mark "
." Pressing the tip of the chuck against a workpiece, pull
-4-
") is aligned with the triangle mark

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