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Operation
CAUTION
Do not operate the jackhamer when the drill bit is not against the work.
Never strike the tool with a blunt object; the housing may be broken or damaged.
Never attempt major maintenance of the tool on the job; take it to a repair shop.
Never drag the tool along the ground; the air ports in the exhaust may fill with dirt.
Always blow out the air supply hose before connecting it to the tool to remove any dirt
inside the hose.
Make sure the tool is well lubricated.
In extremely cold weather, keep drill steel tools wrapped in burlap or cloth until just
before you use them. At 0°F (-18°C) a hardened steel drill loses about 80% of its normal
shock resistance.
Always keep plastic caps or plugs in all ports when the tool is not in service.
Do not lift or transport the tool by the Throttle Lever. Damage can occur to the tool.
Operating Tips
Check the drill steel. The drill steel center hole should be open, and shanks should be flat and
square - not chipped or rounded off. Be sure the shank of the drill steel is the proper length.
Be certain bits are properly ground. Dull bits are hard on the jackhamer and on the operator.
Drill Steel Care
It is very important that the threads of the drill steel be properly lubricated and cared for at
all times. Steels having stripped threads, cracks or severe galling must not be used. Also, care
should be taken while drilling not to bend the steel or gall threads due to misuse.
Bent steel produces unnecessary stresses and accelerates wear on front-head components.
Bent steel and severe thread galling can be avoided if the following steps are taken:
Be sure the steel is bottomed in the bit.
All the threads must be in good condition and well lubricated.
Always drill with a sharp bit. Dull bits cause excessive pounding and unnecessary stresses
on all threads and jackhamer parts.
Never approach the rock with the jackhamer running. Position carefully and collar the hole
at reduced throttle. Once the bit is collared in rock, full throttle may be applied.
Always keep the jackhamer against the work. Insufficient feed pressure will cause the bit to
become loose and damage the threads and cause inserts to tear loose.
Always maintain alignment between the jackhamer and hole.
Never retract the jackhammer at full throttle. Use Half throttle.
Bit Care
For long bit life, the instructions covering “Drill Steel Care” must also be applied to the bit. In
addition, the following steps must be taken:
Never allow the bit to become plugged with loose cuttings. Blow the hole continuously.
Never force or broach the bit into a hole.
Remove the bit from the steel with a bit wrench.
Never strike the bit with a hammer.
Never run a dull bit.
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Summary of Contents for JRD50 Series
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