Remove the 3513 Extruder Servo Motor
Step 1: Remove the extruder servo motor
You can refer to this Wiki to remove the extruder from the toolhead to facilitate the subsequent removal of the 3513 extruder servo motor: https://wiki.bambulab.com/en/h2/maintenance/replace-dual-extruder-unit

Step 2: Remove the right filament cutter
Place the extruder on the table. Use an H2.0 Allen key to remove one fixing screw from the right cutter lever, then detach the right cutter lever and torsion spring from the extruder.

Step 3: Remove the dual extruder filament guide
Use an H2.0 Allen key to remove 4 fixing screws (marked with squares: M2.5x7 * 3; marked with a circle: BT2x6 * 1). Hold the left cutter and the slider at the bottom of the dual extruder filament guide (to align the cutter with the notch on the cutter lever), then pull the dual extruder filament guide forward to remove it.

Step 4: Remove the quick change tool interface
Use an H2.0 Allen key to remove 2 fixing screws (M2.5x7 * 2). Gently wiggle and remove the quick change tool interface, then disconnect the hall connector.
Note: Carefully remove the quick change tool interface to avoid damaging the cables!

Step 5: Remove the dual extruder idlers and filament sensor
Use an H1.5 Allen key to remove the hall FPC fixing screw (BT2x5 * 1) on the right side of the dual extruder idlers and filament sensor, then disconnect the right Hall FPC.
Use an H2.0 Allen key to remove 2 fixing screws (M2.5x19x5), take out the dual extruder idlers, and flip it to the left side to facilitate the removal of the extruder servo motor fixing screws.
Note: Do not remove the left Hall FPC. Be careful when flipping to avoid damaging the left Hall FPC.

Step 6: Remove the extruder servo motor
Use an H2.0 Allen key to remove 2 fixing screws (M2.5x8) of the 3513 extruder servo motor, then remove the extruder servo motor from the dual extruder unit.

Install the 3513 Extruder Servo Motor
Step 1: Install the 3513 extruder servo motor
Align the new extruder servo motor with the holes on the extruder rear cover, then tighten 2 fixing screws using an H2.0 Allen key.

Note: When flipping the extruder rear cover, support the dual extruder gears and cam or remove them in advance to prevent them from falling.