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6. REFINISHING OF PISTONS & CYLINDERS
If the pistons and cylinders should be scored or scratched due to dirty oil, or improper
hydraulic oil specifications, the piston and cylinder can in many cases be polished and
salvaged, instead of being replaced.
This is possible because the components in this hammer are made of high quality alloy
steel and do not use chromium surface finishes which cannot be polished.
Follow the procedures in Figures 19, 20 & 21 and finish by thorough flushing and
cleaning. These parts can usually be salvaged.
Caution: Wear safety glasses for eye protection
Use hand held air grinder with flap type wheels.
Two grit wheels were used:
#240 for Heavy Polish.
#360 for Finishing.
Figure 19.
Rotate piston and polish with brushing motion of
grinder.
Polish total area before changing to fine grit for
finishing.
Figure 20.
After completion of fine polishing, clean labyrinth
grooves carefully with fine needle file to remove all
burrs and rough edges.
Figure 21.
After polishing all rough surfaces and edges, clean all parts by flushing thoroughly.
Lubricate with hydraulic oil before reassembling.
Note: It is not necessary to completely remove all scoring or scratching to full depth of
the scratches. Instead polish the surfaces until any raised edges are flush and smooth
with the original surface. If this procedure is followed excess material will not be
removed and normal tolerances can be maintained inside the hammer.