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Lubrication
Apply special grease (grease for electric impact drills) to the inner circumference of the Connecting Rod [26],
O-Rings (A) [23] in the Striker [22] and in the Piston [25], the sliding portion of the Second Hammer [14], the
Oil Seal [38], the Damper [16], Damper (B) [12], the Damper Washer [17]. Seal 60 g of the special grease into
the Crank Case [28] (Connecting Rod [26] side). Apply Hitachi Motor Grease No. 29 to Needle Bearing (A)
[45], the pinion portion of the Armature Ass'y [55]. Seal 40 g of the Hitachi Motor Grease No. 29 into the Crank
Case [28] (First Gear [44] side).
Oil seals
Be very careful not to damage the O-Ring [32] in the Crank Cover [31], O-Rings (A) [23] in the Striker [22] and
in the Piston [25], the Oil Seal [38] in the Crank Case [28], the O-Ring [21] on the Cylinder Case [19], the
O-Ring [18] on the Front Cover Ass'y [9], the O-Ring [11] in the Front Cover Ass'y [9].
Retainer reassembly
Apply Mollub alloy K#777-1 lubricant to the sliding part of the Stop Lever [3] before assembling. As shown in
Fig. 12, mount the stop lever end surface on the flange of the Front Cover Ass'y [9] and push the Stopper
Sleeve [7] with a flat-blade screwdriver to contract the Stopper Spring [6]. Adjust the holes of the stop lever
and Spring Case [4], and insert the Needle Roller D4 x 20 [5].
Needle roller
Fig. 12
Stop lever
Front cover ass'y
Spring case
Stopper sleeve
Stopper spring
