Electric Demolition Jackhammer
4
How to Use the Jackhammer
1. Squeeze the trigger switch after applying the tip of the bit to the crushing position. In some cases, it is
necessary to punch the tip of the bit against the crushing position forcibly in order to begin the striking
motion. It means that the safe guard mechanism against no-load striking is working.
2. Operate the tool by utilising its empty weight. The performance will not improve even if the tool is pressed or
thrust forcibly against the work surface. Hold the tool with a force just sufficient to counteract the reaction
(Fig. 3).
Maintenance and Inspection
•
Inspecting the tool
Since use of a dull tool will degrade efficiency and cause possible motor malfunction, sharpen or replace the
tool as soon as you note an abrasion
•
Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws
be loose, retighten them immediately. Failure to do so could result in hazardous situations.
•
Maintenance of the motor
The motor unit winding is the very ‘heart” of the power tool. Exercise due care to ensure the winding does
not become damaged and/or wet with oil or water.
•
Inspecting the carbon brushes
The motor employs carbon brushes which are designed to be replaceable. When they become worn or near
the ‘wear limit’, it may result in motor trouble. When an auto-stop carbon brush is equipped, the motor will
stop automatically. At that time, replace both carbon brushes, as shown in Figure 4. In addition, always keep
carbon brushes clean and ensure that they slide freely within the brush holders.
•
Replacing carbon brushes
Loosen the screws of the cap covers, then remove the cap covers (Fig. 5). After removing the brush caps,
the carbon brushes can be removed. After replacing the carbon brushes, tighten the brush caps, and mount
the cap covers securely.
•
Grease Replacement
The jackhammer has been constructed to protect against dust and to prevent lubricant leakage. Whilst the
unit can be used without lubricant for an extended period, we recommend not allowing it to run dry. Use a
spanner to remove the hexagonal sight glass. Add 75W-90W SAE grade oil or something similar. Reinsert
sight glass.
NOTE
: Be sure to switch
OFF
and disconnect the attachment plug from the receptacle to avoid serious
accidents.
