NPK PH4 - Page 41

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TOOL BREAKAGE
TOOL BREAKAGE DUE TO EXCESSIVE WEAR OF THE TOOL
HOLDER BUSHINGS
PREVENTATIVE MEASURES
Replace the tool bushing (BF), and/or tool (HH), when the tool to bushing gap (d15)
reaches the maximum clearance. To determine whether the bushing or tool requires
replacement, follow the instructions in the “MAXIMUM TOOL TO TOOL BUSHING
CLEARANCE” section of this manual.
HAMMER MAXIMUM CLEARANCE
MODEL in (mm)
PH1
1/4
6
PH2
1/4
6
PH3
1/4
6
PH4
1/4
6
BF. Tool Bushing
HH. Tool
d15. Clearance
d16. Tool Diameter
WARRANTY
NPK Warranty does not cover tool failure caused by worn tool holder bushings.