More on the loss of hammer effect. When the bit gets stuck, if I use a hammer to beat the bit back into the jackhammer the hammer effect works for 20 seconds and then the bit gets stuck again.

Hello pissythecat,

The locking assembly, if worn could be the cause of the problem you are having, that would be the least expensive fix. You might want to inspect the bit to make sure it is not worn where it fits into tool holder. Also check the tool holder for wear.

WJA

Hello,
Just wanted to revive this question! (2012 FEB.) My problems is exactly like PAT's, no striking/hammer action! Maybe Cmoorejack can possibly HELP?!

Hi Pat and Villaroj,
What your going to have to do is remove the the front striker assembly and find the problem.It could be a number of things but replace your o-ring as sets or in other words don't replace what looks worn as the o-ring all have ware on them and replacing one or two will only half fix the problem. Once you have disassembled the striker assembly you will need to clean it and be able to see what of any hard parts are broken.Most of the time this will be obvious.Example would be a broken connecting rod or frozen striker.Once you find the problem ,replace the part and use the Service Pack Part Number: 1617000036 and reassemble.I wish I could give you a simpler way but the way I'm explaining is the right way to repair this tool so as not to have recurring problems with it.hope this helps.Good luck.
Tinker

Hey Milillo02,
They do need maintained once in a while..new grease and oil..even when the tool is not used for long period of time the grease's and oil will break down or link removed when the the brush's need to be replaced is the time to do it..[the brush's actually have a 'pop out' feature when they wear sown so the tool quits running] The most crucial components to service is the gear train and the piston and striker assy..along with changing out some o-rings and such:)
as far as the whining noise it may or may not be a problem and can be a characteristic of the tool..if it changes or gets worse,then it is a cause for concern..:(
Parts and breakdowns avail at eReplacementparts.com : Power Tool Parts and Tool Repair
hope this helps.?
cmoorejack

Thanx alot. Yea that helps. But my problem would be what grease/oils to use? What to and how to greas them. I meane inside the casing does it have like zerk grease fittings or am i supposed to take apart the gear case and grease it like that? Which "O" rings should get replaced? I saw the parts breakdown of the hammer but there is more than one seal.. :)...a nymore help would be greatly appreciated.

Hey M,
The best thing to get is the service pack..it comes with the o-rings, grease and brush's..
part # is 1-617-000-036..
no grease zerks and you will have to completely disassemble to service..the oil that is used is a light air tool oil on the o-rings[just a little bit] It doesn't come with the kit but it is a trick of the trade..if you don't have any oil just use the grease on the o-rings sparingly..be careful not to have too much in the piston/striker chamber or the percussion will be weak..
When you are ready to disassemble and service it is recommended that you go to a happy place,light some incense and play some soft rock music..I'm just saying..
Kidding..[sort of]..just be patience and have a breakdown available and you should do just fine..
cmoorejack

thanx alt cmoore...that helps. I will buy that kit and service it. its an awsome tool and i know that as long as u keep them maintained they will give you MANY yrs of service.

Yes you will have to press the eccentirc shaft out. To split the case. I haven't repaired one for a while. But I don't remember a c clip ether. Hope this helps. Dale

Thanks for input, used my puller for a power steering pully for a GM vehicle worked perfect.

Hey Kieth,
The bevel washer should face the front of the tool..so that the shoulder of the impact bolt fits in towards the bevel side..
hope this is helpful..
Craig