Hitachi H 45SR Technical Data And Service Manual page 18

Piston reassembly
Insert the Piston Pin [30] into the D8 hole (marked) of the Piston [31] and the Connecting Rod [32] then press-
fit it. Mount the O-ring [25] to the Piston [31]. Be careful not to protrude the Piston Pin [30] from the outside
diameter of the Piston [31]. Move the crank pin of the Crank Shaft [40] to the bottom dead center and insert
the piston ass'y into the Crank Shaft [40] from the cylinder case of the Cylinder Crank Case [46]. Mount the
Retaining Ring for D10 Shaft [39] using a retaining ring puller (Fig. 15).
Piston pin
D8 hole
Mark
Connecting rod
Piston
O-ring
Cylinder reassembly
Move the crank pin of the Crank Shaft [40] then move the Piston [31] to the top dead center. Insert the
Cylinder [29] into the Cylinder Crank Case [46] (Fig. 16).
Cylinder crank case
Lubrication
Apply special grease (grease for electric impact drills) to the inner circumference of the Connecting Rod [32],
O-rings [25] in the Striker [24] and in the Piston [31], sliding portion of the Second Hammer [18], Oil Seal [45],
Damper (A) [15], Damper (B) [21], Damper (C) [19], inner circumference of Sleeve (A) [27], Hammer Holder
(B) [20] and Hammer Holder (C) [23]. Seal 53 g of the special grease into the Cylinder Crank Case [46] (the
Connecting Rod [32] side).
Apply Hitachi Motor Grease No. 29 to the Needle Bearing (M661) [52], the pinion portion of the Armature [68]
and the Steel Ball D7.94 [7]. Seal 20 g of the Hitachi Motor Grease No. 29 into the Cylinder Crank Case [46]
(the First Gear [51] side).
Cylinder crank case
Cylinder
Retaining ring
Fig. 15
Piston
Fig. 16
--- 15 ---
Crank pin portion
Crank shaft
Crank pin portion
Crank shaft