Hitachi DH 50MB, Технические данные и руководство по обслуживанию

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(3) Slip clutch ass'y
Press-fit the Ball Bearing 6202 [18] into the Bevel Pinion [16] and insert the Washer [19] and then Washer (A)
[20] into the Bevel Pinion. After mounting the Feather Key 3 x 3 x 8 [17] in the Bevel Pinion, press-fit the Gear
Holder [21] into the Bevel Pinion. Next, apply special grease (for hammer and hammer drill) to the inner
circumference of the Second Gear [24]. Install the Second Gear [24] on the outer circumference of the Gear
Holder and place the Needle Pins [23] without inclination as indicated in Fig. 19, then press the Springs (C)
[22]. Press in the Spacer [25] and then Ball Bearing 629 [26].
Fig. 19
Bevel Pinion [16]
Second Gear [24]
Gear Holder [21]
Second Gear [24]
Gear Holder [21]
Needle Pin [23]
Spring (C) [22]
Section A-A
A
A
(4) Inspecting the carbon brushes
The motor employs auto-stop carbon brushes. When the carbon brushes near their wear limit, the motor
stops automatically. At that time, replace both carbon brushes with new ones which have the same carbon
brush number "77" as shown in Fig. 20. In addition, always keep carbon brushes clean and ensure that they
slide freely within the brush holders.
Fig. 20
Number of carbon brush
("77" denotes the last two digits of the code number.)
77
17 mm