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Opening the Bosch MUM4
Last updated on Sep 2, 2026
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Introduction
Go to step 1 ↓The MUM4 series is an older line of Bosch swivel arm models. In order to perform repairs, the swivel arm must usually be opened.
What you need
Tools
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Position the swivel arm so that you can lay it flat on the work surface with the underside facing up.
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Remove the five Torx T15 screws on the underside.
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Carefully lift off the underside of the swivel arm. If it is stuck, use a plastic opening tool to help.
Ask FixBot
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Mark the setting of the rotary selector and carefully lift it out.
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Inserting the push rod during reassembly is a bit tricky. It is easier if you lift the entire motor unit up slightly. Insert one pin of the push rod into the selector wheel first, then the second pin into the corresponding hole on the PCB.
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The swivel arm is open and you can continue working on the motor or the drive.
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Watch out for the other half of the cover on the swivel arm; it detaches easily, especially when you lift the device off the work surface.
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Follow the steps in reverse order to reassemble your device.
