RBA Door provides a large range of LCN Sentronic systems and accessories. Explore the breakdown of the 4040SE, 3130SE, 4310ME and 4410ME series and find the correct replacement part for your unit. Please note, if you have the 4010SE or 4110SE Sentronic door closer, you can replace the track assembly with the 4040SE-3038. If you are looking for a new arm, please call us. The 4040SE-3077T will not work with the 4010SE or 4110SE.