Precautions In Disassembly And Reassembly Of Battery Charger - Hitachi DN 12DY Technical Data And Service Manual

(2) When soldering Internal Wires (A) [9] (Red) and [10] (Black) onto the Motor [8], be very careful to ensure
correct motor polarity. As illustrated in Fig. 5, there is a red mark close to the terminal which indicates the
positive pole.
(3) Be very careful not to bend or otherwise damage the base portions of the leadwires of the FET which are
connected to the DC-Speed Control Switch [16].
(4) Tighten each fastening screw with the appropriate tightening torque indicated below.
Tapping Screw (W/Flange) D3 x 16 [13]
Bind Screw M3 x 7 [5]
Flat Hd. Screw (Left Hand) M5 x 17 [4]
Drill Chuck 10TLRJ-N (W/O Chuck Wrench) [3]
(5) Lubrication
Apply NPC SEP-3A (Code No. 930035) to the following.
Teeth portion of the Spindle [2]
Teeth portion of the Second Pinion [7]
Pinion of the Motor [8]
(6) Confirm that the rotation direction of the spindle conforms to the rotation direction setting of the pushing
button. When the pushing button is set to the "R" position, the spindle must turn to the right (clockwise) when
viewed from the tail end of the tool (the end opposite the drill chuck). With a 9-mm dia. test bar (special repair
tool J-222-3: Code No. 305-714 is available for supply) mounted in the drill chuck, ensure that run-out is not
more than 0.5 mm when measured at a distance of 85 mm from the end of the chuck.

10-2. Precautions in Disassembly and Reassembly of Battery Charger

Please refer to the Technical Data and Service Manual for precautions in disassembly and reassembly of the
Battery Charger UC 12SD, UC 14YF2 and UC 24YFA.
Positive terminal
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • •
This red mark indicates the positive pole.
Negative terminal
Fig. 5
1.1 --- 1.9 N
• • • • • • • • • • • • • • • •
0.3 --- 0.5 N
2.9 --- 3.9 N
12.7 --- 14.8 N
• • • • • •
--- 14 ---
m (11 --- 19 kgf cm, 9.5 --- 16.5 in-lbs.)
• •
m (3 --- 5 kgf cm, 2.6 --- 4.3 in-lbs.)
• •
m (30 --- 40 kgf cm, 26 --- 34.7 in-lbs.)
• •
m (130 --- 170 kgf cm, 112 --- 148 in-lbs.)
• •