Tightening Torque - Hitachi DH 24PM Technical And Service Manual

(9) Mounting the gear cover
After reassembly as shown in Fig. 31, ensure that the Change Lever [34] is adjusted to the "Hammering only"
position. Engage the claws of the Clutch [61] and the Reciprocating Bearing [65] each other. Align the wing
portion of the Lock Plate [58] horizontally and reinstall the Gear Cover Ass'y [18] so that the wing portion of
the Lock Plate [58] is contained in the rail inside of the Gear Cover Ass'y [18]. When the Second Shaft [63]
contacts the Pinion Sleeve [57] inside the Gear Cover Ass'y [18], move the Change Lever [34] to the "Rotation
and hammering" mode and rotate the Grip [4]. Then the Second Shaft [63] and the Pinion Sleeve [57] are
engaged and the end surface of the Gear Cover Ass'y [18] contacts that of the Housing [83]. At this time,
rotate the Grip [4] to check that the rotation of the Cylinder [38] is transmitted to the armature shaft.
Housing [83]
Engage the claws of the Clutch [61]
and the Reciprocating Bearing [65].

9-3. Tightening Torque

Tapping Screws D4 [79] [97] [99] ............................................... 2.0
Tapping Screw (W/Flange) D5 X 35 [19] .................................... 2.9
Drill Chuck 13VLRH-N (W/O Chuck Wrench) [27] ...................... 34.3
Flat Hd. Screw (A) (Left Hand) M6 x 25 [26] ............................... 4.9
End surface of the
Housing [83]
Position the wing portion of the
Lock Plate [58] horizontally.
Move the Piston [53] to the top dead center.
End surface of the Gear Cover Ass'y [18]
Rail in the Gear Cover Ass'y [18]
Spring (B) [35]
Move the Change Lever [34] to the
"Hammering only" (
Fig. 31
0.5 N
0.5 N
5 N
0.5 N
--- 33 ---
Gear Cover Ass'y [18]
mark) position.
m (20 5 kgf cm, 17.4
• •
m (30 5 kgf cm, 26.0
• •
m (350 50 kgf cm, 305
• •
m (50 5 kgf cm, 44
• •
4.3 in-lbs.)
4.3 in-lbs.)
44 in-lbs.)
4.3 in-lbs.)