NPK GH7 - Page 50

NPK
- 49 -
TOOL BREAKAGE
TOOL BREAKAGE DUE TO EXCESSIVE WEAR OF THE TOOL
HOLDER BUSHINGS
PREVENTATIVE MEASURES
Replace the tool holder bushings when the clearance (d15) reaches the maximum limit
listed below. See the NPK Hydraulic Hammer Service Manual for maximum diameter
(d16) tool bushing (G) wear chart and minimum tool (HH) diameter (d16).
MODEL
MAXIMUM CLEARANCE
INCH (mm)
GH7, GH9, GH10 3/8 (10)
GH12, GH15,
GH18
1/2 (13)
GH23, GH30,
GH40, GH50
5/8 (16)
WARRANTY
NPK Warranty does not cover tool failure caused by worn tool holder bushings.
G. Tool Bushing
HH. Tool
d15. Clearance
d16. Tool Diameter