# SV08 Extrusion Motor does not work **URL:** \ **Category:** Sovol SV08\ **Created:** [September 6, 2025, 2:36pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672 "2025-09-06T14:36:27Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 6, 2025, 2:36pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/1 "2025-09-06T14:36:27Z")
Mein Problem: Ich musste einen neuen, gesamten Druckkopf kaufen und einbauen, nachdem eine Menge Filament meinen Original Druckkopf mehr oder weniger zerstört hat. Ich habe bei Sovol den gesamten Extruder gekauft, aber nach dem Einbau funktioniert die Filamentzufuhr nicht mehr. Der Extrusion Motor arbeitet nicht. Die Düse wird aufgeheizt bis 250 Grad, aber das Rad transportiert kein Filament und rührt sich nicht. Jetzt habe ich auch noch das Mainboard erneuert und es hat nichts verändert. Alle Funktionen funktionieren, nur der Filamenteinzug nicht. Das Rad bewegt sich nicht. Was kann bzw soll ich tun? ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [September 6, 2025, 3:29pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/2 "2025-09-06T15:29:32Z")
Bitte verwenden Sie einen Online-Übersetzer, da es sich in erster Linie um ein englisches Forum handelt. Please use a online translator as this is primarily an English forum. ```auto My problem: I had to buy and install a new, entire printhead after a lot of filament more or less destroyed my original printhead. I bought the entire extruder from Sovol, but after installation the filament feeder no longer works. The extrusion motor does not work. The nozzle is heated up to 250 degrees, but the wheel does not transport filament and does not move. Now I have also renewed the motherboard and it has not changed anything. All functions work, except the filament feeder. The wheel does not move. What can or should I do? ``` If you turn the manual wheel can you extrude filament? Does the manual wheel turn when you send an extrude command? ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 6, 2025, 6:10pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/3 "2025-09-06T18:10:30Z")
Yes, if I turn the wheel manually I can extrude filament. It’s not possible to activate the wheel by sending a command. Even I replaced the mainboard and the whole toolhead 2 days ago. I am helpless how to continue. ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [September 6, 2025, 6:26pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/4 "2025-09-06T18:26:23Z")
Check the motor wires (4 pin connector) at the toolhead board. You could even try plugging in your old motor if you can make the wires reach. ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 6, 2025, 10:03pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/5 "2025-09-06T22:03:15Z")
I plugged in the old and the new motor-no reaction on both motors… All the other actions are running. ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [September 6, 2025, 10:57pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/6 "2025-09-06T22:57:27Z")
It sounds if if your new toolhead has a bad board that isn’t able to run the motor. Email [info@sovol3d.com](mailto:info@sovol3d.com) concerning the issue. Include your order number. You could try swapping the old board into the new toolhead. Your SURE there are no changes to your printer.cfg? Klipper could be sending the extruder move instructions to the wrong pin. ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 7, 2025, 7:54am UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/7 "2025-09-07T07:54:23Z")
I will check Klipper. Another question. On which pin is the motor connected to the motherboard? I can"t find any information about the location of the connection pin. Y,Y,Z axis are shown on the Sovo Mainboard “map”, but there is no information regarding E-Motor… ---
**Author:** ![regnullify](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/regnullify/32/4211_2.png) [@regnullify](https://forum.sovol3d.com/u/regnullify)\ **Post date:** [September 7, 2025, 2:38pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/8 "2025-09-07T14:38:03Z")
Here’s the extra MCU pinouts [https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/b/b8131f9010f7639c8ca9a2dce31d390a5e621cbb.jpeg](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/b/b8131f9010f7639c8ca9a2dce31d390a5e621cbb.jpeg) ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [September 7, 2025, 2:42pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/9 "2025-09-07T14:42:58Z")
Unless you messed with the motherboard, I wouldn’t think this would be the issue. It worked before you replaced the toolhead & now it doesn’t. Check the wiring & plugs on the toolhead board & anything else you removed during install. Looking into Klipper files & anywhere else seems like your going down a rabbit hole…JMO Stick with the basics & move out slowly from there. If you put in a ticket with Sovol, see what they have to say…again…JMO ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 7, 2025, 3:10pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/10 "2025-09-07T15:10:02Z")
what I found out now: when the function “load fil” is activated, the motor get no power… I measured…but the head heats up and the display shows “retracting” of course nothing happens because the motor has no power… How to get power? ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 7, 2025, 3:14pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/11 "2025-09-07T15:14:21Z")
I mean the plug on the motherboard on the bottom of the printer. here are a lot of plugs but where is the extruder motor connected? ---
**Author:** ![regnullify](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/regnullify/32/4211_2.png) [@regnullify](https://forum.sovol3d.com/u/regnullify)\ **Post date:** [September 7, 2025, 3:25pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/12 "2025-09-07T15:25:53Z")
The extruder motor connects to the extra MCU in the tool head. The MCU communicates with the extra MCU via usb ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [September 7, 2025, 3:32pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/13 "2025-09-07T15:32:42Z")
This might help. ![SV08 Motherboard](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/4/40a4a9c9350e8bc1c78258d014a21bf0ade9c5be.jpeg) ---
**Author:** ![Franzl](https://avatars.discourse-cdn.com/v4/letter/f/b782af/32.png) [@Franzl](https://forum.sovol3d.com/u/Franzl)\ **Post date:** [September 7, 2025, 5:22pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/14 "2025-09-07T17:22:25Z")
Could you kindly show me the position of this “communication” please? > **(attachments)** > > ![Mainboard Übersicht.jpg](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/e/ef4277d81996e2a9fdbbf74c553551c090e70082.jpeg) ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [September 7, 2025, 6:08pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/15 "2025-09-07T18:08:05Z")
I don’t own a SV08, so unless someone has a better idea..follow the wires. ![SV08 Toolhead Board](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/0/087d73e211a2be2d61df7df9880f9e1f32d12c39.jpeg) ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [September 7, 2025, 6:28pm UTC](https://forum.sovol3d.com/t/sv08-extrusion-motor-does-not-work/8672/16 "2025-09-07T18:28:26Z")
The board in the toolhead is a separate MCU ```auto [mcu extra_mcu] serial: /dev/ttyACM0 restart_method: command ``` The extruder motor pins should be addressed as: ```auto [extruder] step_pin: extra_mcu:PA8 dir_pin: extra_mcu:PB8 enable_pin:!extra_mcu: PB11 [tmc2209 extruder] uart_pin: extra_mcu:PB10 interpolate: True run_current: 0.8 hold_current: 0.8 uart_address:3 sense_resistor: 0.150 ```