The pressure foot release lever lifts the pressure foot up, but it does not go down with the lever. I have to manually pull it down. After pulling it down, it does go up with the lever.
The machine is in great shape. It is about 8 years old and was used heavily for the first three years. However, it has been rarely used the last three years.
Your machine just needs to be tuned up an the part inside that lower and raises the presser foot needs to be re-lubricated. Lint, dust, dryness and the machine not being used can cause this issue with most pfaff machines (including my 7570). A standard tune up from your local PFAFF dealer will remedy this.
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To access the light bulb, use the button-hole foot to lift up the insert on the arm cover. Remove the cover. Hold the edge guide slightly tilted and push it into the opening in the head of the sewing machine. Press down on the lamp housing to hold it still. Push up on the bulb and turn it counter-clockwise. Once the bulb is loose, pull it down and out of the lamp housing. To replace the bulb, continue to hold the lamp housing. Push the new bulb into the housing and rotate it clockwise. Release the lamp housing and then use the button-hole foot to replace the cover.
It sounds like the pressed bar is sticking and will not push down completely and is difficult to lift. I have come across them many times on the older pfaffs. Unfortunately that is not sometime that can be fixed at home. It is caused by the lube going bad inside the pressed bar that lubbricates the spring that is inside the pressed bar. Find a pfaff dealer that knows about older pfaffs and they should be able to help.
I just addressed this issue with my 6110. There is a spring in the shaft for the pressure foot. Over time the white grease that lubricates the spring and the plastic piston at the top dried up, gumming up the works. I took it all apart, cleaned out the bad (now hard grease), re-greased and put it all back together. Works like new. I used a lithium grease as it is easy on plastic parts.
Has any little kids been around lately? Have they had access to your sewing area and machine? (thinking perhaps the pressure foot tension has been tightened down) If it has been tightened, losen it a couple turns, see if that helps (remember, left to loosen, right to tighten)
When is the last time you oiled this machine? Typically sergers require a clean and oil each time you go to use them. Locate the bar that correlates to the presser foot add a drop of oil to the bar and let it seep in. After a few minutes try lifting the presser foot.
on the machine, there is a foot holder attached to the machine, & the feet to the machine will either be snapped on to the foot holder or there is a screw to undo. most of the new machine are snap on feet, take the presser bar lever up, there is a little lever on the back of the foot holder, & you push it toward the foot holder bar & it will release the foot & you put the other foot down on the needle plate & bring the foot holder bar down on the foot until it snaps on to the foot
I dodn't know your model really well but it will be one of the following:
a clip on foot that you just pull down on to remove,
a clip on foot with a button at the back of the pressure foot holder - press the button to release the foot
a clip on foot with a little lever at the back of the pressure foot holder - lift the lever to release the foot
If it is a clip on foot, then you just need to raise the pressure foot lever, put your fingers onto the pressure foot and press downwards, it should unclip.
To put one on, place the pressure foot onto the needle plate under the pressure foot bar and lower the pressure foot bar down onto the foot, lining up the base of the foot holder with the little bar on the foot, it should click into place.
Make sure you have the presser lifter lever in the proper position. When lowering it, push to the rear and it will stop half way down. This engages the upper tension but keeps the foot from lowering down and touching the fabric. If this doesn't help please post the exact problem, i.e. thread pulling to the bottom etc. Good luck!