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Warranty Guide for Pavement Breaker Accessories

 

All tools are forged from a high carbon, shallow hardening tool steel and must receive proper care to insure long life. When a tool has failed to give satisfactory service, visual inspection may give a quick answer to the cause. Examine the cross section of the steel at the point of fracture and observe the grain structure which will very likely appear similar to one of the following four examples:

 
Normal Hardened Structure:

Note the fine grain outer 'case' of uniform depth typical of high hardness for maximum strength. The interior coarse-grained 'core' is of lower hardness which gives enough toughness to withstand shock. Once this structure is disturbed, breakage is inevitable.

Evidence of Fatigue Failure:

The normal structure is not disturbed but a thumbnail crack has developed from the outer surface. Fatigue develops from prolonged use of dull tools or from undue prying or jacking while operating under full air pressure. If the proper tool is being used for the job, prying is unnecessary and harmful. Not a manufacturing defect.

Internal Flaw in Steel:

Smooth moon-like circle caused by some foreign substance being rolled into the bar. Very rare but replacement is in order.

Resharpening Failure:

Note smooth curved lines starting from outer edge and extending partly or wholely across the surface sometimes leaving a coarse-grained area showing complete absence of fine grain (and thus absence of original hardness). This is the most common type of failure which usually occurs from 3" to 5" back from the point resulting from improper heating during resharpening. The comparitively soft area will not withstand the strain of continued service and breakage is inevitable. Replacement is not warranted.

Failure of Blade Tools: 

Blade breakage following little use may develop from a hidden hardening strain. The fracture is usually semi-circular and discoloured. Replacement is warranted.



Mushrooming:

This is caused by driving the point into a hard dense material for too long a period of time without penetration. This generates intense heat, softening the point, thus causing it to fold over. Discoloration, usually in a blue tone, is usually evident behind the mushroom. This is not a manufacturing defect.

Aside from the type of breakage, always check the tool to determine how much of it is worn back from the original length. The best way is to place it beside a new tool and note the difference in length and shape. If this is not possible, measure the length under collar and check with the length shown in catalog. Tools showing considerable wear are not subject to replacement

Due to their high hardness most tools may be in use several hours before showing perceptible wear.

Tools, like the human body, get tired and snap if they have been pushed too hard and too long. They are not made to last forever.

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