NPK GH7 - Tool Retaining Pin Inspection

NPK
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TOOLS
TOOL RETAINING PIN INSPECTION
The tool retaining pin (D) serves to keep the tool in the hammer when the hammer is
raised off the ground for repositioning. Additionally, the retaining pin will become worn
during normal use. Figure “A” shows the retaining pin when it is new. Note: the two
guide grooves (AN). The guide groove areas and the area (122) between the grooves
are the areas where the wear will take place. If large, flat areas are found here, the pin
must be replaced. This would indicate that the hammer is not being greased frequently
enough.
Figure “A”
Normal wear (20) will occur on the pin as shown in Figure “B”. Grind this area on a
bench grinder or with a disc grinder to remove any burrs. Reuse the pin.
Figure “B”