Specifications

-19-
Inner cover rib
Hammer case rib
Hammer Case [7] end surface
(3) Connecting hammer case assembly and armature assembly
Mount the Washer [16] on the Gear Holder [18] and push Inner Cover (D) [25] into the Hammer Case
[7] while matching the hexagonal portion of the Pulse Unit [13] with that of the Gear Holder [18]. Make
sure the end surface of Inner Cover (D) [25] is located in the farther side than the end surface of the
Hammer Case [7].
Locate so that the rib of Inner Cover (D) [25] is at right angles to the rib of the Hammer Case [7].
(See Fig. 10.)
3. Reassembling Housing (A).(B) Set
Mount the Pulse Unit [13], Hammer Case [7], Inner Cover (D) [25] (including Armature DC 14.4V [26]),
Magnet (D) [27] (including Yoke (A) [28], Dust Guard Fin (C) [29], and Side Yoke [50]), and the Brush
Block [30] together in Housing (A). (See Fig. 14.)
Notices on reassembly:
• Be sure to fit the projected portion of Dust Guard Fin (C) [29] to the depressed portion of the Brush Block
[30] in advance. (See Fig. 8.)
• Fit the detent depressed portion of Magnet (D) [27] to the jut of Housing (A) at reassembly.
(See Fig. 7 and Fig. 11.)
• Make the detent jut of Hammer Case [7] contact with the detent receiver of the housing (see Fig. 13)
when fitting the Hammer Case [7] to the housing. Thread the lead wire of LED light through the space
between the housing and Hammer Case [7] as shown in Fig.12.
• Make sure the Hammer Case [7] is correctly set in the housing. If the Hammer Case [7] is not set in the
preset groove of the housing or if the rib of Inner Cover (D) [25] is not at a right angle to the rib of the
Hammer Case [ 7] , then re-fit the Hammer Case [7] to the housing. (See Figs. 10, 12, and 13.)
Only when the Hammer Case [7] is correctly fitted can its axial movement be prevented. Therefore, make
sure that the Hammer Case [7] is correctly fitted to the housing.
• Apply silicon grease (Shin-Etsu Chemical Co., Ltd. KS609) to the DC-Speed Control Switch [45] surfaces
where the FET and Dust Guard Fin (C) [29] contact each other before assembling the DC-Speed Control
Switch [45] in Housing (A).
NOTE: Without silicon grease on the surface, the FET becomes very hot. Bend the three lead
wires from the FET and pass them over the DC-Speed Control Switch [45] without touching
Pushing Button (A) [42] as shown in Fig.14. (See Fig.14.)
Fig. 10 • Connecting hammer case assembly and armature assembly