RD 12/RD 12A Disassembly & Assemblywc_tx000671gb.fm 919.18 Installing the ExciterPrerequisites Front drum removed Drive-motor-side exciter bearing installedProcedure Follow the procedure below to install the exciter.1. Install the key and the gear (a) of the exciter motor coupling onto the exciter. Secure thegear to the exciter with the set screw.2. Slide the exciter (b) through the drum and into the drive-motor-side bearing race.3. Temporarily install the exciter-side drum hub (c) onto the drum using three screws.4. Check the exciter for end-play. To do so, grab the exciter (b) with a needle-nosed pliersand pull and push it back and forth inside the drum. There needs to be 5±1 mm(3/16±1/16 in.) of end-play for correct performance. If the correct amount of end-play isnot found, remove the drum hub and install shims (d) as needed to obtain the correctamount of end-play. Then, using Loctite 243 on the six screws, secure the drum hub tothe drum. Torque the screws to 49 Nm (36 ft.lbs.).This procedure continues on the next page.wc_gr004165bawc_gr004166cbd5 mm(3/16 in.)dc
