Front Cover; Repair Guide; Precautions In Disassembly And Reassembly - Hitachi CR 18DMR Technical Data And Service Manual

7-3. Front Cover

WARNING:
The Model CR 18DMR is equipped with the front cover to protect the operator against possible electric
shock, and it is not intended for cutting live lines. The front cover covers both the gear cover and the
upper cover to protect the operator against electric shock in the event that a live line is accidentally cut
and electricity flows from the blade to the metallic enclosure. Customers must be instructed to hold the
handle (made of polycarbonate resin) with one hand and the other hand on the front cover to support the
main body during the cutting operation. Be sure to instruct the customers that the front cover must not
be removed when using the Model CR 18DMR.

8. REPAIR GUIDE

8-1. Precautions in Disassembly and Reassembly

Please follow the precautions below for disassembly and reassembly procedures. The circled numbers in the
following figures and the [Bold] numbers in the descriptions below correspond to the item numbers in the Parts
List. Prior to attempting disassembly or replacement of the saw blade, ensure that the battery is removed.
8-1-1. Disassembly
(1) Removal of the Upper Cover [8]
Remove the Saber Saw Blade [501]. Remove the Hex. Socket Hd. Bolt (W/Flange) M5 x 12 [25] and pull out
the Base [16]. Remove the two Machine Screws (W/Sp. Washer) M4 x 12 [17] and the Cover Plate [18], and
pull out the Front Cover [19]. Remove the four Hex. Socket Hd. Bolts (W/Sp. Washer) M5 x 16 [9] from the
Upper Cover [8]. Pull the Upper Cover [8] straight and remove it.
(2) Removal of the Plunger [3] from the Upper Cover [8]
Remove the two Seal Lock Hex. Socket Flat Hd. Bolts M5 x 12 [28] from the Connector [33]. If the Seal Lock
Hex. Socket Flat Hd. Bolts M5 x 12 [28] are too tight, heat the Upper Cover [8] to 100 --- 150ûC then loosen the
Seal Lock Hex. Socket Flat Hd. Bolts M5 x 12 [28]. Pull the Plunger [3] forward (toward the blade) and
remove from the Upper Cover [8].
(3) Removal of the Gear Cover Ass'y [27] and the Housing (A).(B) Set [46]
Remove the two Brush Caps [47] and the two Carbon Brushes (1 Pair) [48]. Remove the four Tapping Screws
(W/Sp. Washer) D5 x 30 [26]. Then the Gear Cover Ass'y [27] (together with the Armature Ass'y DC 18V [41])
and Housing (A).(B) Set [46] can be removed.
(4) Removal of the Gear Cover Ass'y [27] from the Armature Ass'y DC 18V [41]
Remove the three Machine Screws (W/Sp. Washer) M4 x 12 [17]. Then the Gear Cover Ass'y [27] can be
removed from the Armature Ass'y DC 18V [41].
(5) Disassembly of the Armature Ass'y DC 18V [41]
Remove the Retaining Ring (E-type) for D10 Shaft [38] from the Armature Ass'y DC 18V [41] with a flat-blade
screwdriver. Remove the Ball Bearing 6001VVCMPS2L [39] from the pinion side with the bearing puller ass'y
(J-30). Then Bearing Cover (A) [40] can be removed. Remove the Ball Bearing 608VVC2PS2L [42] from the
commutator side with the bearing puller ass'y (J-30).
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