2. INSPECT THAT STATOR IS NOT GROUNDED Using an ohmmeter, check that there is no continuity between the coil leads and drive end frame. If there is continuity, replace the drive end frame assembly. Brush and Brush Holder 1. MEASURE EXPOSED BRUSH LENGTH Using a scale, measure the exposed brush length. Standard exposed length: 10.5 mm (0.413 in.) Minimum exposed length: 4.5 mm (0.177 in.) If the exposed length is less than minimum, replace the brush. 2. IF NECESSARY REPLACE BRUSHES (a) Unsolder and remove the brush and the spring. (b) Run the wire of the brush through the hole in the brush holder, and insert the spring and brush into the brush holder. (c) Solder the brush wire to the brush holder at the exposed length. Standard exposed length: 10.5 mm (0.413 in.) (d) Check that the brush moves smoothly in the brush holder. (e) Cut off the excess wire. (f) Apply insulation paint to the soldered point. Bearings 1. INSPECT FRONT BEARING Check that the front bearing is not rough or worn. Replace if necessary.