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?
Matt

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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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Mar 06, 2014 | Electric Demolition Jackhammer

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Feb 03, 2014 | Electric Demolition Jackhammer

1 Answer

Takes long time to start hammer function


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if it is an electric jack hammer the brushes in the motor maybe worn out. most ace hardware stores have a good selection of motor brushes. also check to see if the brush retension screw came loose this would also cause the same problem.

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