Question about Electric Demolition Jackhammer

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I have a old electric 120vac jackhammer (not sure manf.)

Motor works but hammer has very little action. I have disassembled everything loks fine including piston ring. Should the crank shaft be submersed in oil.Should there be a vacuum in the inner cylinder?

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Usally their is grease packed in the hammer part,you can usally see a plastic type bung(plug)on outter casing

Posted on Dec 27, 2009


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Posted on Jan 02, 2017


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If the hammer function works once it warms up, then it's not broken - it's probably just plugged up with contaminants. You may need to disassemble to clean it out, although first I would get some Electrical parts spray , unplug unit,and soak down the inner workings while MANUALLY moving the shaft in and out, alternating spraying and moving. Let it finish dripping, then use a heat gun on low setting or a hair dryer on high setting to dry out the internals, then try again. Repeat procedure until hammer function works, then lubricate. You need to get the junk out before you lube, or it will make a bigger problem.
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