5 Care and Use Critical to tool life is using the tool at the correct working angle of 90 to the working surface Failure to do this will result in high contact pressure between the tool and the bushings and the likelihood of galling between the surfaces In turn this can lead to premature failure of the tool plus damage and rapid wear to the bushings W orn bushings can allow the tool to be angled over to a position where the striking face is hit at an angle by the piston W or k ing Ang le Lubrica tion Lubrication of the toolbushing with the correct quality high temperaturehigh pressure grease at regular intervals is essential Such greases are best able to cope with the extreme contact pressures generated by an incorrect working angle leverage and excessive bending etc USE OF CHEAP SUBSTITUTES OR NO GREASE A T ALL IS A MIST AKE AND WILL RESUL T IN PREMA TURE T OOL F AIL URE Blank F iring Continuing to use the hammer when the tool is not or only partiall y in contact with the work surface will result in the tool being fred down on the retainer pin This will cause heavy wear and damage to the uper retainer fat radius area and the retaining pin itself T ools should be examined regularly eg every 40 hours for damage in this area which should then be ground out At the same time as the tool is examined the time should be taken to check the tool bushings for wear and damage looking to replace or repair as necessary Ov erhea ting A void continuous working in one position Do not strike in one spot for more than 1015 seconds before changing the tool to another position Failure to do this can lead to excessive heat buildup at the working end with mushrooming as a consequence Le v er a g eBending Using the tool as a lever to help break the ground is a common tool breaker A void leverage and excessive bending at all times Loose R unning Keep the boom and hammer feed suffcient to ensure that the tool is held against the hammer shoulder stop at all times when working T ool R econditioning Under most normal conditions the tool will not need reconditioning However tools that have lost their shape on the work ing end can cause high stresses throughout the tool and hammer Reconditioning by milling or turning is recommended W elding or fame cutting is not recommended as the heat generated could cause structural changes within the material which in turn can lead to premature failure or rapid wear