Here is a detail part list from Hilti.
Link
HERE to open the drawing and part list.
Please bookmark this page for reference.
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The item in question is carbon brush.
This is inter-grade inside item 2 (the electric motor).
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Hilti has a life time warranty on labor and two year in parts.
This model was introduced around March 2009.
Check the model plate for production date.
Contact you local Hilti rep to send the unit for free repair.
Act now to avoid the labor charge (2 year FREE labor)
In most case you can use the manufacture t oprove the unit is under 2 years old.
A sales order or receipt of this
Hilti SFH 18A will help speed up the repair process.
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Additional references
Hilti, Inc.
5400 South 122nd East Avenue
Tulsa, OK 74146
Phone:
(800) 879-8000
Fax:
(800) 879-7000
Espa?ol:
(800) 879-5000