Machine runs slow and won't speed up when pedal pushed down further

To slow down the stitching speed on your Husqvarna Viking 18 x8, you can try the following steps:

1. Check the machine's manual: First, consult the manual that came with your Husqvarna Viking 18 x8 machine. The manual should have instructions on how to adjust the stitching speed.
2. Adjust the stitch length: One way to slow down the stitching speed is to adjust the stitch length. A shorter stitch length will slow down the machine's stitching speed. Refer to your machine's manual for instructions on how to adjust the stitch length.
3. Change the foot pressure: Another way to slow down the stitching speed is to change the foot pressure. Reducing the foot pressure can help slow down the machine's stitching speed. Again, refer to your machine's manual for instructions on how to adjust the foot pressure.
4. Use a different presser foot: Some presser feet are designed for slower stitching speeds. You can try using a different presser foot to slow down the machine's stitching speed.
5. Use a speed control pedal: Some machines come with a speed control pedal that allows you to adjust the machine's stitching speed. If your machine has a speed control pedal, try using it to slow down the stitching speed.

If none of these steps help slow down the stitching speed on your Husqvarna Viking 18 x8, you may need to contact a professional technician for assistance.

it could be pedal control or the speed control unit on the motor as it is reasonably common for that machine
take it in for a service to ensure that other factors ( thread around bobbin shaft, fluff etc is not slowing the machine

what type of machine do you have. I have two that I operate with buttons and it has a little slide button to speed or slow down I don't know why it should run to fast with a foot pedal because you control the speed with your foot you may want to check to see if there is any trash that has gotten in the foot and somehow not allowing the foot to come back up

It sounds as though the foot pedal is the problem. Maybe a shorted out wire in the actuator (rheostat). When your foot is off the pedal there should be no power running through it. If it has a short then it "thinks" the pedal is partially depressed to the slow position so runs at that speed. If the pedal can be removed/unplugged from the machine, do this and see if the machine stops running.

tighten the belt

Check to see if there is something caught up in the foot pedal, like a scrap of fabric. That could be enough to prevent you from fully closing the pedal. Disconnect the pedal from the machine and from the wall. Holding the pedal in your hands, squeeze it closed as far as you can. Release. It should pop open. If it does not, then the pedal springs may be broken or worn out.

We don't know what machine you have, but the following may be helpful:

Wheel on right side that controls the needle up and down is very tight...

check the plug in to the outlet first
then check the power cord connection to the sewing machine
could be something wrong with the power cord
could also be something wrong with the motor
also could be a wiring problem

THE FOOT PEDLE IS NOTHING BUT A REASTAT. A REASTAT IS A WIRE WRAPPED AROUND A CONDUCTOR THE WINDINGS START OUT FAR APART AND GET CLOSER TOGETHER THE FARTHER YOU PUSH THE PEDLE DOWN . THE FAR APART WIRES ARE THE SLOW SPEED THE CLOSER ONES ARE FASTER SPEED
THESE WIRES WILL WEAR OUT OVER TIME OR CORRODE OVER TIME AND CAUSE THIS PROBLEM. TRY SOME ELECTRICAL CONTACT CLEANER AND SPRAY THE FOOT PEDLE INSIDE ANY WHERE YOU CAN AND LET DRY. MOST CONTACT CLEANERS ARE NONE CONDUCTIVE AND DRY IN MINUTES

sounds like the contact in the foot peddle has failed try a new peddle