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MAIN BODY BORE REPAIR
HONING MAIN BODY
Generally, honing of the main body is not recommended. This is due to trying to
maintain the I.D. of the body as close to the new standard dimension as possible.
However, when honing is required, the use of a ball hone is recommended. Using a
fixed power hone is not recommended, (consult NPK before using a fixed power hone).
The guidelines for using a ball hone are outlined below:
1. Apply a light coat of NPK Assembly Lubricant, p/n H010-5010 or equivalent oil.
2. Using the proper size hone as shown in the following chart, push / pull the hone
through the body 6 times using even strokes.
3. Clean bore of the body. Check dimensions of I.D. Compare to the chart on page 61.
If dimensions are within usable limits, reassemble the hammer. If dimensions are outside
the allowable range, contact NPK for assistance.
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