Stanley Black & Decker MBX138 thru MBX608 user manual Breaking, Operation, Notice

OPERATION

BREAKING

The operator should note the sound of the blow when the breaker is running. With experience, the operator will be able to tell the difference between a good solid blow and a hollow sounding blow. A hollow blow means that solid blows are not occurring and the breaker should be repositioned.

Continuous tool penetration usually does not do much good. If the material does not break with 3 to 4 inches of tool penetration, it usually won’t break with full penetra- tion. The time used for additional penetration could be better used to strike blows in another place.

Do not break continuously in one place

Figure 7. Breaking

NOTICE

Continuous breaking in the same area for lengthy periods will create excessive temperatures at the tip of the tool bit resulting in loss of temper (hardness) of the bit and causing mushrooming of the tip of the bit, and may lead to failure of the bit.

Many materials do not respond well to continued ham- mering in one place. The breaker tool should be reposi- tioned on the work each time the tool penetrates but does not crack the material.

Scoring with the breaker

Figure 8. Scoring with Breaker

Use a “scoring” method of breaking when cracking the material becomes difficult. This technique involves strik- ing the rock or concrete at several places along a line where you want the crack to occur. Most materials break sooner when struck several places along a line than when struck repeatedly in one location. On each line, the breaker tool should be continually repositioned. Practice determines the best length of time to stay in one spot (15-20 seconds) and how far to move the breaker tool.

Breaker tool binding can cause erratic breaker opera- tion and premature wear on the tool shank. Breaker tool binding is caused by failure to direct the down force in the direction of the tool bit.

Do not pry with or bind the tool bit

Figure 9. Breaker Binding

12 ► MAXFORCE BREAKER User Manual