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Champion
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®
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®
®
330
MANUFACTURER OF DOWN HOLE HAMMERS AND BITS
05/12/17
the case to backhead thread joint must be tightened as much as
MANUALLY
possible (see note below). This will assure full thread contact when using the
backhead to lift the entire assembly.
NOTE
DUE TO THE INTERNAL COMPRESSION SPRINGS, THE CHAMPION 330 BACKHEAD
CAN ONLY BE
FULLY
TIGHTENED WITH A POWER WRENCH ON THE RIG.
CAUTION
LIFTING THE CHAMPION 330 HAMMER WITH THE THREAD JOINTS LOOSE MAY
CAUSE DAMAGE TO THE THREADS
•••••
Lifting and supporting the entire unit, place the bit retaining rings with the o-ring
installed on top of the chuck. Place the thrust washer on the shoulder of the chuck.
Placing the chuck assembly beneath the hammer, thread the hammer down on the
chuck threads until flush to the thrust washer.
CAUTION
DUE TO CLOSE TOLERANCES BETWEEN THE CHAMPION 330 INTERNAL PARTS AND
THE CASE, NUMA CANNOT ACCEPT RESPONSIBILITY FOR DAMAGE CAUSED BY
WELDING ON THE CASE OD. WELDING ON THE CASE CAN CREATE DISTORTION,
CAUSE PREMATURE FAILURE AND VOID THE WARRANTY. CONTACT NUMA FOR
SPECIAL INSTRUCTIONS IF WELDING THE CASE BECOMES UNAVOIDABLE.
