Hitachi DH 40MC, Руководство по обслуживанию, Страница: 5 / 17

-4-
Fig. 8 • Mounting the piston
Fig. 7 • Mounting the first gear and crank shaft
[46]
[48]
[47]
[85]
[45]
Reassembly can be accomplished by reversing the disassembly procedure. However, special attention
should be given to the following items.
1. Reassembly of the hammering mechanism
(1) Mounting the first gear and crank shaft
• Press-fit Oil Seal (B) [90] to the Crank Case Ass'y
[91] .
• Mount the O-ring (S-40) [89] .
• Press-fit the Ball Bearing 6203DD [88] .
• Use a retaining ring puller to mount the Retaining
Ring for D40 Hole [87] .
• Press-fit the Crank Shaft [85] to the Ball Bearing
6203DD [88] .
• Insert the Feather Key 3 x 3 x 8 [86] into the
Crank Shaft [85] groove.
• Support the plane of the Crank Shaft [85] with an
adequate steel rod and use an adequate tool to
press-fit the First Gear
[123] .
NOTE: Prior to press-fitting, make sure the
Feather Key 3 x 3 x 8 [86] matches the
key groove of the First Gear [123].
(2) Mounting the piston
• Insert the Connecting Rod [48] into the Piston [47] , and then press-fit the Piston Pin [46] from the D8
hole (marked side) of the Piston [47] .
NOTE: Be careful not to let the Piston Pin [46] project from the outer diameter of the Piston [47].
• Mount the O-ring [45] on the Piston [47] to make the piston ass’y.
• Next, turn the Crank Shaft [85] to the position shown below, and then mount the piston ass’y to the
Crank Shaft [85] from the Cylinder Case [22] side of the Crank Case Ass'y [91] .
NOTE: The piston ass’y can be assembled even when the Bevel Gear [43] and Slip Clutch
Ass’y [93] are mounted to the Crank Case Ass'y [91].
Reassembly
[87]
[86]
Adequate steel rod
[89]
[85]
[91]
“ Φ 2” concavity mark
Adequate tool
[123]
[90]
[88]