I undid the screw of the foot shaft without a foot on it and the shaft dropped to the plate. I have levered it up and put foot on but the foot wont lift, can you advise me how to fix this please?

Take the side face plate off (usually 1-2 screws) .... to see inside where the lever mechanism is located. It did not look like the face plate hinges open, which is a feature on some machines but it was hard to tell from the user manual. If you are lucky ... it just may need cleaning/lubrication or a set screw has come loose on the presser foot shaft. Some machines have this problem if they have a knee/thigh bar that can be inserted in the machine to activate the raising of the foot. Sometimes that associated mechanism gets hung up preventing the lever from doing anything ... but it looked like the 4830 did NOT have this feature. Good luck with your troubleshooting

-There’s a lever for the presser foot pressure, turn it to “1”.
-On that piece the lever is on to the rear, there’s also a white plastic flat head screw, turn it and that will release that side cover. (You’ll kind of still need to pry it off, it seemed a bit like I was going to break the plastic, but it comes off).
-Once it’s off and the inside part of the needle bar is exposed, turn the handwheel until the needle bar is at its top dead center position, revealing a smaller flathead screw that will be just above the light.
-Either tighten or loosen that screw to move the needle bar to correct height, which leaves exactly 11.5mm between the tip of the over-edge needle B and the top edge of the needle plate. I put an arrow on the pic I posted of where the screw I’m talking about is.
Hopefully that helps someone and makes sense.

Consult your owner's manual. It should show how to open your machine (if it can be opened by other than a professional).

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You can correct this.

Put an ordinary foot on. There's a clamping screw at the back of the part that has twisted round. The head of the screw faces towards the right of the machine (towards the hand wheel). Get a decent screwdriver and loosen the clamping screw a little. Turn the part round so that the sides of the feet are precisely parallel to the slots in the needle plate. Retighten the clamping screw.

Try not to let the misaligned part slide up or down which it will if you slacken the clamping screw too much. It's at the right height when the little lever you use to hold the foot in place has engaged about one third to one half it's length on the lump on the side of the foot at the top.

Presser foot up, takeup lever at the top, thread the machine normally all the way and through the needle, open the needle plate, press the little lever to the right, wind the thread from the needle round the presser foot screw, press on the foot control slowly and wind the bobbin, when you have enough thread on the bobbin close the slide plate the winder will drop down, pull the threads to the back of the machine and start sewing

Remove bobbin, presser foot, needle. Tip machine back on towel gently. Unscrew plate--don't lose screws! Do not service in presence of children and curious pets. Put foot pedal next to you on tabletop. Use Zoom Sewing Machine oil. Any part MOVING that are NOT gears get one drop oil. Any DRY ONLY gears get dab of Singer sewing machine lubricant. Replace screws. Secure screws. Open left front compartment & one drop oil @ top of needle bar. Open race shuttle (where bobbin case fits in). One-half drop oil of on oscillating hook (bottom left - hand corner...smear that oil around! Insert NEW needle all way UP in needle bar groove, flat needle shank toward back. Turn handwheel towards you and raise. Raise presser foot so that threading locates all tension slots a's you pull thread TAUT from spool to each tension slot and left to right through silver, metal take-up lever, and down to tension bracket, pass needle, then pull 6" thread towards you and thread from FRONT to BACK of needle. Place bobbin into case and "thread" it. Set presser foot on DOWN position. Turn handwh towards you, dipping needle into needle plate. Make loop with bobbin thread, pull towards you. Place a good 7" underneath presser foot (both threads). Let machine RUN on 24" scrap to distrubute oil/lube. That's it! Jimmy

Every few weeks you should put a drop of oil in the opening of the bobbin case (visible when the bobbin is out) after cleaning that area. (This is to the center front of the bobbin case.)

Every few months, you need to put oil (just a drop) on several points inside the face plate. One spot is high (near the thread take up lever when in its highest position). Then oil the upper shaft of the needle and presser foot mechanism and at the top of the section with the screw midway down the shaft (the farther back). Add a drop of oil at the bottom of the shafts (two spots), Additionally put a drop of oil farther right near the thread path.

Once a year, remove the top cover and place a drop of oil at both holes on the top. (One is near but to the right of the main spool pin; the other is near the thread guide at the take up lever.) Put a drop of oil at the hole at the center right of the deck of the sewing machine (right next to the motor and below the stitch width selector). With the top cover off, there are a number of spots that need oil. One is near the center of the machine at the take up lever (top of shaft). The next is at the center of the stitch width cam. Place another drop of oil at the top of the lever that rests against this cam. Place a drop of oil at the bottom of the lower gear (the one that turns in the horizontal plane). Also oil three points to the right of the vertical gear. (These are the two sections on the shaft to the right of the gear and the point in that same line just to the right of the screw to the back of the area.) Remove the bottom of the sewing machine and oil seven points (three to the left and 4 on the right). Do this carefully - you do not want to get oil on the motor or the belt. These points are on the left: on the shafts near screws at the top and bottom and one spot near the center just in front of the belt. For the points near the screws, the one further up is closer to the left edge of the nachine. On the right side: two points above the belt. One is right next to the belt and one is on the shaft below a screw (this shaft continues to the lowest oiling point on the left side).

The manual for the Singer 457 is available from Singer as a PDF: http://www.singerco.com/uploads/download/5d6ce627c00cb91c477d4703f1b704aab08a72c8.pdf . See the diagrams starting on page 53 (page 55 of the pdf) for the exact oiling points. I tried to explain these spots but I usually grab the manual for the pictures for my machine for the yearly oiling. You can buy a copy of the manual from Singer for $15 here: http://www.singerco.com/accessories/instruction-manuals/ . Enter the model number without any extra letters at the end of the model number. Then click Search.

I hope this helps.

Cindy Wells

I have a used unit with the same problem. If you remove the plastic housing piece on the far left you can see how the foot lifter works. Raising the lever raises a collar around the main shaft. There is a screw in that collar which connects the collar with the shaft. If that screw is loose the collar will not raise the shaft. Caution: Tighten the screw very carefully, only enough so that the shaft lifts. I just overtightened and the collar has a crack now.

This procedure is SPECIFIC TO THE PFAFF 7570. It MAY work for you. Try at your own risk.
Needed tools:
Small flat screw driver.
Large Phillips screw driver
Small torx screw driver
Large torx screw driver
Small cleaning brush
Small scissors and long tweezers.
Machine oil.
Old tooth brush.
Dish detergent.
Lots of care and patience.
In this particular case, perseverance was the winner. I'm quite handy with mechanical things, so I had to partially disassemble the machine until I found the cause of the problem. The foot presser mechanism DOES have a spring, but it's concealed and out of sight. I never suspected it, but that was the case. When I found it, white grease that was put there at the factory to lubricate its movement had turned into a think sticky gunk. That was what was holding the foot presser in the up position. This gunk was so stubborn! I had to clean the spring, the housing and a plastic pin really well, and then oiled all the components inside their housing. More below.
The shaft of the foot presser is hollow at the top. This is designed to hold a 1-5/8" spring and a 5/8" black plastic pin that's inserted at the top of the spring and protrudes from the hollow shaft.
Start placing the 7570 on a table that has a height that's comfortable for you. You'll be standing and squatting a lot to accomplish the task.
Standing behind the machine, and looking down, there's a metallic plate on your right that holds the thread tension discs. This plate covers the shaft, found underneath, and holds together the mechanism with the round wheel with numbers that protrudes slightly on the side of the machine's body.
Several pieces had to be disassembled in order to get to this plate, although at this point I'm doubting whether or not so much work was necessary, since I was so excited upon the discovery that I forgot to notice whether I could have found the spring and remove it without having to disassemble so many pieces.
The metal plate is black and thick, and is held down with a heavy gauge black machine screw. The plastic pin makes contact with the underside of this plate, which compresses the spring when the foot presser lever is up. Once the lever is disengaged from its locked or resting position (in the case of the embroidery position), the compressed spring pushes the entire foot presser down, as it DID when I first bought the machine.
These are the disassembly steps, without diagrams, but use your imagination as best you can to picture my description.
1 - Top cover removal.
The top cover (the one with the different built-in patterns drawn on its inside face) is held in place by two thin black metal plates where it hinges. A little bit of pressure towards the outside on the top of one of the plates (on either side) will release the pivot pin on one end, and then a little jiggle in the same direction will release the other. Put the cover aside.
2 - Concave top cover removal.
This cover is the one that houses the thread spool in the horizontal position, if that is your choice when sewing. It is held down by two plated machine screws, one short and one long. After removing the screws a little jiggling will help removing it, pulling it mainly upwards. You may need to put the large handle up, to allow for more movement. Put it aside once removed.
3 - Side cover removal.
This covers the area where the foot presser is housed, on the left side of the machine, as you face the buttons on the front of the machine.
Standing behind the machine, once step 2 has been achieved, one can see from the top, looking down, a large black machine screw on your right hand side, just inside the cover. You don't need to remove it completely, just about 1/2 turn will loosen the pressure to release the cover. Pull the cover outwards and sideways and set aside. You may want to also remove the light bulb, to be able to get to the mechanism to clean it, to remove pieces of thread that may be lying around or caught in the different moving parts. Push the light bulb gently in while turning it counter clockwise. You'll feel it disengaging from its socket. Pull it out and set it aside. Clean it if necessary. Use the scissors and the tweezers to remove any lint and debris.
4 - Pressure discs plate removal.
I'm not 100% sure now that this can be done at this stage, but continue. If this particular plate cannot be removed, because other components get in the way, then skip to step #4A below and come back here later.
Standing behind the machine, looking down at the housing, you'll see another large black machine screw holding down a black metal plate. Remove it completely and put it aside. Next, remove the plate, gently nudging its way out of the different obstacles that may be present. One of them may be the sewing shaft mechanism. If this is the case, gently turn the wheel manually to cause the mechanism to move up or down, as to allow more room for the plate to be completely removed.
Make sure you lift this plate slowly, as to prevent the spring and plastic pin from spilling inside the machine's body. Put the plate aside. Now you see the black plastic pin, perhaps stuck inside the hollow part of the foot presser. If so, pry it loose gently and clean it with a sudsy solution, and use an old tooth brush to remove the gunk from its coils. Do likewise to the plastic pin.
While you have the housing exposed with lots of space, I would suggest you should remove any debris, dust, etc, and oil all the moving parts with sewing machine oil.
5 - Assembly.
This is done in the reverse order. Congratulations! You've done it!
Additional steps, if metal plate in step 4 above cannot be removed after step 3.
4A - Front plate removal (The one with the colored buttons and LCD display).
Standing behind the machine, looking down, you'll see a grey ribbon cable crossing the case from back to front, under the main shaft. Remove its connector by pulling it up gently. No force or tools are necessary. Bend the ribbon to one side and set it aside, out of the way.
Squatting a little from the same position, looking inside the foot presser housing, you'll see two small plated screws, close to the edge of the housing, one towards the top and another towards the bottom. Remove completely.
In the same squatting position, and moving your attention to the main machine housing, you'll see the green PCB board. It's held by at least three screws. One of them, on your extreme left, is not visible because it's concealed by a plastic insert at the top of the left end of the 7570. This insert is held down in place by a thin black metal plate. This plate has a tiny hole where the top cover of step 1 hinges.
Gently turn the small torx screw holding down this plate 1/2 turn counter clockwise to release the pressure. Once loosened, slide the plate slightly towards your right. This will allow you to pull the insert up.
With the insert out of the way, squatting again, you'll see the third plated screw on your left. Remove it.
Turn the machine upside down and ensure it's not rocking from side to side.
Use the large torx driver to remove the machine's base. This base contains a power supply box, and another green PCB board. It's connected to the rest of the machine with several ribbon cables of different colors. The base is attached by 4 machine screws. Loosen the screws completely and remove using the tweezers.
Raise the base from the right end, allowing its other end to rest on the edge of the inverted 7570 body and stand it at 90°. Inspect the location, orientation, and general layout of the cabling. You may need to unlatch one or more plastic holders for the ribbons, which hold them flat and organized. Remove these holders to have greater access to the connectors.
Jot down the order of the different ribbons and the way the are inserted into their sockets on the PCB found inside the base. Fortunately the connectors are of different sizes, and there should be no way to insert the wrong one in the wrong socket, but it's best to be safe. Jot down order, color, etc.
Gently pull on the different connectors from the PCB board. A little bit of force is all that is needed. Push them aside one by one in order to allow you to see more and create more space.
Next, disconnect the large power cord. You need to insert a small flat screw driver to release pressure on the sides of the socket. Do it one side at a time, and then gently pull it out. Set the base aside. You're almost done!
Next, looking down, pushing the ribbon cables away from you, you'll see two plated screws in each corner of the inverted 7570 housing, on the side closest to you. Remove completely. At this time you should be able to remove the face plate, gently threading the widest of the ribbon cables through the opening on your left, in order to put the base aside.
With the face plate out of its position, put the machine in its straight up position and step 4 above can be accomplished.
Now, I also did remove the 7570 main handle in order to create more space and see more in the reduced area of the foot presser housing. If you too find it necessary to do so, use the corner of the tip of a small flat screw driver to pry the lock ring open, being careful not to allow it to spring out of your fingers and falling inside the case. Slide the pin out and then the handle itself, horizontally.
Go back to step 4 above if you came here because you could not do step 4.

You lever doesn't work because the presser foot Bar is seized from lack of use.Open the side of the machine to access the bar. Put a mixture of water and ammonia ( about 80%water 20% ammonia) on the top and bottom of the bar. Let it sit for 15-20 minutes then try to move the presser foot Up by lifting the foot with a screw driver. Do not pry so hard you break something. It should get progressively easy the more times you do this. Put some sewing machine oil on the top and bottom of the shaft and it should be good to go.
sewman7