Question about Dewalt DW999K 7/8" Cordless SDS Rotary Hammer

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DeWalt dwd520 grease

Need source for gear case grease

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Found it from links at the DeWalt Web Site.

Posted on Jan 05, 2014


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Posted on Jan 02, 2017


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Hi my dewalt d25900k is leaking oil from the plastic caseing on the side of the breaker where the gears are i taken it apart ,i will get a new gasket ,it has lost alot of oil ,what sort of oil do i need...

The gasket your looking for is part# 487224-00 SEAL which lists for $3.65. The gearcase should use LUBCON GLK 249 grease spread evenly across the gears. Be careful with the amount you apply, too little grease will not properly lubricate and too much will create additional friction cause the to motor to work harder, thus reducing its effectiveness and longevity. ONLY THIS GREASE SHOULD BE USED ON THE INTERNAL COMPONETS OF THIS TOOL. Note that the bit grease is different than the gearcase grease and SHOULD NOT be used on any internal components.

5g on connecting rod and piston - inside and out

39g in gearcase evenly coating all parts

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I have a dewalt 28402 grinder. I have replaced the pinion but I don't know how to get the helical gear out of the case to replace it. Any thoughts? Thanks Chris

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Lubrication and maintenance reciprocal saw DeWalt

Before you attempt any of this I would recommend going to and see what the inside of this tool looks like. It appears that you need to remove part of the front gearcase to get into the lube. The back e.g. brushes is not that big of a deal. If there is a Service Center near you they have a Max repair rate that they will fix anything on this saw at a preset firm price and if it is less that is what they would charge.

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