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21
INSPECTION OF PARTS
1. Seals
Seals that are deformed, scratched, worn or aged should be replaced (see Figure 16).
It is recommended that all seals be replaced when disassembling the hammer.
Figure 16. Seal Conditions
2. Moving parts
Check for any scratches or damage on the surface of the piston, cylinder sleeves, main
valve and bottom part of the piston where it strikes the tool. Significantly damaged or
scratched parts must be replaced.
3. Front cap
a. Deformed or worn shank bushings or front cap bushings must be replaced, see
Table 8 page 23.
b. A severely worn or damaged tool set pin must be replaced.
4. Replacing the front cap bushing
a. Measure shank and front cap bushings and refer to Table 8 page 23 and Table 9
page 24.
b. Remove bushing set pin and bushing spring pin using a hammer and drive pin.
c. The front cap bushing must be torch cut at three locations (at three 120° grooves)
if it is the only bushing to be replaced. Avoid cutting into the front cap itself.
d. Any scratches in the front cap must be smoothed after bushing removal.
e. Install the new front cap bushing in the correct direction with part numbers on the
bushing facing the installer (away from the hammer.) Because the bushings are a
press, or interference fit, heating of the front cap and cooling of the bushing will
help installation.
f. Insert the bushing set pin and the bushing spring pin.
BE CAREFUL OF HOT SURFACE. USE GLOVES TO PROTECT
AGAINST BURNS AND POSSIBLE SHARP EDGES.