Genuine DeWalt replacement part. rnIncludes 1 Carbon Brush with wire lead and terminal in rubber sheath attached.rnrn • Worn brushes are frequently the cause of a poorly running motor. • Replacing brushes can fix an intermittently operating motor. • New brushes can restore a motor's electric braking. Model DCST990M1. Dewalt 40V MAX XR 4.0 Ah Lithium-Ion Brushless 15 in. 40V MAX XR 4.0 Ah Lithium-Ion Brushless 15 in. 40V MAX 4.0 Ah Lithium-Ion Battery - DCB404. Series 40V MAX XR. Battery Amp Hours 4.0 Ah. Find helpful customer reviews and review ratings for DEWALT DCST990M1 40V MAX 4.0 Ah Lithium Ion XR String Trimmer at Amazon.com. Read honest and unbiased product reviews from our users. Save dewalt dcst990m1 to get e-mail alerts and updates on your eBay Feed. + Items in search results DEWALT DCST990M1 40V MAX 4.0 Ah Li-Ion XR Brushless 15" String Line Trimmer in this manual should be performed by Black & Decker authorized service centers or other qualified service organizations, always using identical replacement parts. IMPORTANT WARNINGS FOR STRING TRIMMER 1. Use the proper size and type of cutting line. Do not use metal wire, rope or the like. Do not use cutting line heavier than that recommended The following DeWalt manuals, or owner's guides, are available for download from our server. Choose the link that corresponds to the DeWalt model's manual you wish to download. The user manuals come in pdf format for quick downloads. DeWALT DCST990M1 40 Volt MAX 4 Ah Li-Ion XR Brushless 15in. String Trimmer NEW DeWALT DWF83WW 2 TO 3-1/4-Inch 28 Degree Plastic Wire Weld Framing Nailer. Add to Cart. $248.99 $249.00. DeWALT DWF83PL 2 TO 3-1/4-Inch 21 Degree Plastic Round Head Framing Nailer. The DEWALT DWO1DT915 trimmer line keeps your trimmer head full and ready to go. This bulk package of 144 ft. allows for economical change of line. Compatible with: DCST990B, DCST990M1, DCST990H1, DCST990X1, DCST970X1, DWO1DT980. Aerodynamic line is ideal for cordles