Question about Necchi 4595 Mechanical Sewing Machine

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Changing worn belts

After new belt is installed, the other belt does not fit well and wheel is too tight??

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Re: changing worn belts

You should get exact belt size/shape, especially when there is no tension adjustor.


Posted on Jan 25, 2008

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How do I remove the metal case of my sewing machine so I can replace a belt?

A: You asked, "How do I remove the metal case of my sewing machine so i can replace a belt?" Without the specific Make and Model number it is impossible to give a specific answer, so with such a general question you can only get a general answer regarding Metal-Case machines (since that is the only information you provided in your question).
Many Metal-Case sewing machines usually have either:
(A) External Motors and External Drive-Belts, changing the belt is easy and intuitive.
(B) Internal Motors that are Internal Direct-Drive and have no Drive-Belts to change or adjust.
(C) Internal Motors and Internal Belt-Driven Hand-Wheels, and this is what I assume you have. To change the belt:
(1) Unplug the machine.
(2) Remove the Top-Panel (usually 2 or 3 screws need removal). Some machines (very few) have a pry-off top that has no screws, just internal spring-clips that hold onto nubbins under the lid.
(3) Remove the Left Side-Panel that fits around and under the Hand-Wheel (if it has a side panel; and it may be plastic, there should be 1 or 2 slot-head screws holding it in place. If it just has 1 screw it is generally centrally located; if 2, one may be high and the other low. A few machines also have interlocking tabs that fit into the body, that must be un-puzzeled to remove.
(4) Loosen the motor Drive-Belt Pulley to remove the old belt (it is usually a slotted set-screw or a small Allen Wrench (Hex).
If there is a Part Number on the old belt, use, or measure the old belt and/or use the Part Number to help match it to a new belt. If you have a manual, it may show the Drive-Belt Part Number; there are also Parts Lists for many machines. Less expensive generic parts are often just as good, as long as they are of the correct size, configuration and installed properly. Avoid the rubber-band type giant O-Rings to Drive machines, Belts are better *.
(5) Replace the new Drive-Belt and Drive-Belt Pulley, adjusting the belt tension so the motor can reach full speed without laboring. "A Twee-Bit Too-Loose" is better than being "Too-Tight"., but best to be just right, that is to allow the belt to deflect a little if pressed in the middle, yet tight enough so there is no slippage. A lugged belt (often Orange color, but sometimes Black) makes it much easier, since there is no slippage due to the lugs, and it can allow the machine to turn easier (with less resistance than * tight O-ring Drive-Belts) to sew better with less motor- bushing wear). "Assembly" is the reverse of "Disassembly".
-- Amender (2016 FEB 23)

Jan 30, 2016 | Sewing Machines

3 Answers


The one thing on a sewing machine that needs the most repair work is the belt. The sewing machine belt is a piece of rubber that makes the wheel turn and the needle go up and down in a sewing motion. If the belt is in bad shape, the sewing machine will not work. Sometimes while sewing you may notice a burnt rubber smell. When you smell this, you know it is time to change the belt. Changing a sewing machine belt is fairly easy; just make sure you have the proper belt.

Dec 08, 2015 | Sewing Machines

1 Answer

Change drive belt

Setting the belt tension on the 707-708-717 machines with the old rubber "Continental" belts:
1. Make sure that the hand-wheel spins freely on the main-shaft bushing stub when the release knob is loosened.
2. Assuming that you are using the original 441mm "Continental" rubber v-belts, the setting is made by means of loosening a 5mm Allen socket cap screw at the base of the step pulley support.
NOTE: The hand-wheel, stepped pulley, and motor pulley v-grooves must be clean. This is to say, that they cannot have any particulate or threads wrapped around the grooves.
4. The pulley will be automatically pre-tensioned to a 7 o'clock position by means of a spring to maintain the stepped pulley position. By pulling the belt toward this 7 o'clock position, the pulley tension can be adjusted and then tightened by means of the fixing screw.
5. It is important to know that both the upper and lower belt tensions can be independently adjusted so as to allow the hand-wheel to spin freely for bobbin winding without having the hand-wheel drive the machine. This is done by adjusting the step pulley support + or - radially, near the 7 o'clock position.
If the hand-wheel drives the machine with the upper belt loosened, then either the belt is too tight or the hand-wheel bushing and main-shaft stub need cleaning and lubrication.
Note: Lubrication was once the standard factory procedure with a class 68 oil, but experience dictates a dry lubrication with graphite. Silicone lubes are not recommended.
6. Do not over-tighten the 5mm Allen fixing screw as the 5mm threaded frame boss can be broken off.
Adjusting with the original Polyurethane v-belts on models 807-801-810-817-811 machines:
1. Follow the same procedure as mentioned but allow the step pulley's positioning spring provide the belt tension. Nothing more is required here.
NOTE: Sometimes these belts and pulleys get oily thus allowing much slippage. A simple cleaning of the belts and pulleys with mineral spirits can solve this problem.
After-market belts:
NOTE: One can find after market belts that serves to drive these machines but not without some problems as they are usually wider belts and don't fit the pulleys well. In this case some adjustment will be necessary.
SewTechnical Home

Mar 28, 2014 | Bernina Sewing Machines

1 Answer

Pfaff 139, need to replace motor to fly wheel round belt

There are plenty of sewing machine belt suppliers on ebay. A 41/2" diameter universal rubber belt should fit your machine

Feb 23, 2014 | Sewing Machines

1 Answer

Handwehell asembly

Always take a photo before you take something apart to know how to fit it together again. Is the belt too tight? is it the correct belt? Redo the procedure again and check carefully when putting it together again. Move the hand wheel a few times during assembly to make sure its loose and the belt sits properly on the motor and hand wheel gear.

Jan 11, 2014 | Singer 3116 Simple

4 Answers

Why is the hand wheel of my new consew 206rb-5 so tight? the machines hums when sewing, like beeind forced, is this part of the breaking in?

contact the one you bought the machine from & tell them how
tight the hand wheel is & see what they recommend

Jun 04, 2012 | Consew Sewing Machines

1 Answer

The belt on my consew 7360 sewing machine wont turn handwheel when pressing foot pedal to stitch.

Your belt may be to tight you can loosen the belt at the wheel under the table. Loosen the screws and shift so the belt loosens.

Nov 14, 2011 | Consew 7360R-1 Mechanical Sewing Machine

1 Answer

I have singer 724 and have it torn down to put the new belt in. I almost have it back together except I can not get the cam holder back in spot it belong. Their is the needle arm ball pivot that I think it...

Unfortunately your explanation is not clear enough, have you changed the drive belt or the cam belt ? if you have changed the drive belt there shoulkd be an adjuster so the belt fits on nicely

Aug 11, 2010 | Singer 6038 Mechanical Sewing Machine

1 Answer

Singer 328k bobbin winder replacement

Follow these instructions, undo the 2 screws on the right hand side plate where the balance wheel is and take the plate off, undo the screw on the chrome stop motion wheel, undo the stop motion and take it off, take off the 2 pronged washer and notice which way it goes on, not a problem if you can't remember, you should be able to pull the balance wheel back so you can get to the screws on the winder, if you can.t and if you have a problem getting the balance wheel all the way then go the very bottom of the machine and you will see 2 big holes and one of the holes will lead you to a big screw and nylon adjuster, slacken the screw and move the nylon adjust so the belt goes slack, you can not take the balance wheel all the way off to get to the screws on the winder, take the old one off and screw the new one on, whilst you have the balance wheel off it would be wise to put some thin oil on the shaft before you put the balance wheel back on, when you have the balance wheel on and the and the belt round the pulley turn the nylon adjuster so the belt is tight and tighten up the screw, put the side plate back on, put the 3 pronged washer back on, put the stop motion wheel back on and just tighten finger tight then tighten the small screw.

Nov 22, 2009 | Singer Sewing Machines

2 Answers

The foot pedal does not make the machine sew but it sounds like the motor is working. The machine does work when you manually turn the hand wheel. It was working before I put the cover on the machine.

Is the belt broken ?
Unplug, remove the side panel at handwheel and check....use the old one as a sample to take with you to buy a new one...DO NOT adjust the belt too tight on installation, it will overburden the motor.....or have the repair shop do the job for a little investment in peace of mind

Jul 31, 2009 | Husqvarna Viking 1

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