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D
1
: Original diameter of chisel
D
2
: Minimum diameter of chisel worn out
D
3
: Original diameter of bush
D
4
: Maximum diameter of bush worn out
Chisel:
Initial diameter (D1) for the chisel is shown in the following table. The chisel diameter should be measured in
the direction of minimum diameter. Replace the chisel if the diameter is worn down to below the lower limit
(D2) specified in the table.
Chisel bush and front bush:
The inner diameters of the chisel bush and front bush are the same when new. The initial diameter (D3) for
chisel bush and front bush is shown below. Replace the both bushes, if the diameter (D4) is exceeded upper
limit specified in the table.
PRB008 ~ 040(H) is equipped with the front bush by 1-piece type, so checking of the front-head is required.
When replacing the chisel bush and the front bush, ensure the bushes and bore of the front head are
cleaned without any dirts. And, apply Moly-based grease to their mating surfaces.
Dimension limits of Chisel, Chisel Bush and Front Bush:
Unit: mm
Hammer model
Nominal diameter
of Chisel and bushes
(D1, D3)
Lower limit of
Chisel diameter
(D2)
Upper limit of
Chisel Bush & Front Bush
(D4)
PRB008
PRB010 / 020
42
45
40
43
44
47
PRB030 50 47 52
PRB040(H) 58 55 60
PRB050 68 65 71
PRB060 80 77 83
PRB100 93 90 96
PRB150
PRB170
105
117
102
114
109
124
PRB200 125 122 129
PRB250 135 132 140
PRB300 150 147 155
PRB400 165 162 171
PRB500 180 177 186
PRB700 205 201 211
Chisel Bush / Front Bush
Chisel
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