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[Trimmerman79]

While I was sewing, I was hearing a loud squilling noise from the motor. I checked and seen the belt was slipping on the clutch motor pulley. Is there an adjustment for this or is there something else could be causing this issue? Machine juki 1541s with clutch motor.

[BigRig]

Squealing could be a bearing? Did it smell like smoke or burnt smell?

[John]

First thing, Remove the belt from the machine and turn the machine over by hand from the hand wheel. Make sure the machine turns over smoothly and there is nothing binding in the machine. If everything is ok with the machine the belt tension adjustment is here. It doesn't need to be crazy tight like a car. It Just needs to be taunt.

[Trimmerman79]

Squealing could be a bearing? Did it smell like smoke or burnt smell?

No smoke or burn smell. The squealing was the pulley wheel as the belt was slipping.

[Trimmerman79]

Adjusted the belt all is good now. But I will need to get a new belt soon. I seen a good size crack in the belt.

[John]

Oh yeah. Looks like that might go soon. Be careful.

[Trimmerman79]

Oh yeah. Looks like that might go soon. Be careful.

So when I’m pressing the pedal and about to engage, the motor hums and that’s when I know it about to start sewing. I see the belt slipping on the motor pulley. Is that normal? Also when I’m using the sewing machine wheel to move the needle up and down, I see it slip on that motor pulley. Is that normal also? I never paid attention to this before I started having issue. Where can I get a belt for this also since this one is worn pretty good? Belt that’s on now says consew. Thanks

[BigRig]

Trimmerman,

Do a search for Industrial Machine Mechanics in your area. It would be good to have a parts supplier and mechanic for your machine on hand. Otherwise I will wait for others suggestions.

[John]

@Trimmerman79 No the belt should not slip on the pulley. That belt looks pretty old and stretched out.

When you turning the machine by hand the belt slips because there is a break on the motor. You need to slightly push down on the pedal to release the break and it will be easier to turn over your machine. Just be careful you don't push it so far down that the motor engages while its running and you have your hand on the wheel. SIDE NOTE: This break feature is only on clutch type motors. Anyone reading this with a servo motor it does not apply. Servo motors do not have breaks and spin freely by hand.

I usually find a belt at the auto parts store that is close to the size I need.

Hope this helps!

[Trimmerman79]

@Trimmerman79 No the belt should not slip on the pulley. That belt looks pretty old and stretched out.

When you turning the machine by hand the belt slips because there is a break on the motor. You need to slightly push down on the pedal to release the break and it will be easier to turn over your machine. Just be careful you don't push it so far down that the motor engages while its running and you have your hand on the wheel. SIDE NOTE: This break feature is only on clutch type motors. Anyone reading this with a servo motor it does not apply. Servo motors do not have breaks and spin freely by hand.

I usually find a belt at the auto parts store that is close to the size I need.

Hope this helps!

Okay thanks, I tried what you said and it works good now. No slipping when I turn the hand wheel. It’s very tight if I try to turn it without my foot on the pedal. Once I press the pedal slightly the brake disengages correctly. I adjusted the belt tension also, no more slip. But I will still get a new belt since this one is worn pretty good. Now I feel I can slow the machine down much better now. I guess since it wasn’t tight and it was slipping, when it would catch the pulley speed was already rev up and made it like super fast at engagement. I’m going to give the clutch motor a try for a week or two then order the sailrite workhorse servo motor. Thanks again everyone.

[John]

Glad you got It figured out!
I have a clutch motor on the Juki I use in most of the videos. I don't mind it. It does take some getting used to though.

[luxuryluke]

It sounds like a worn belt to me, for sure. I recently learned that leather pulley belts were used so that they could quickly adapt a round piece of leather to any size machine and pass through the clutch motor area easily which was impossible with a closed belt. Newer clutch motors are different these days, for sure, but I'm thinking that's why they're used.

I switched out the old Consew clutch motor on my Necchi cylinder arm machine for a new Consew 3000 servo motor for only $130 and it's 1hp! No longer do the lights dim when i start up the machine, no more hum, no hard to control speeds, no more! Well worth it in my opinion. Also, the model i bought features a 'slow start' that will start off at only 200rpm for a varying amount of seconds before regular speed kicks in.
Also, I replaced the 75mm pulley on the new servo with a 45mm pulley for around $5. The result is slower speeds, helpful for me since i sew very thick leather sometimes. On the other hand, pulleys can start to shine up and get slippery, depending on your environment.
Also, while I was at it, I installed an SR2 Speed Reducer pulley from Bob at Toledo Industrial Sewing for a very low price and bought some urethane round belting at around 10mm to .5" thick, cut it to size, melted it together with a mini gas torch-heated razor blade (see youtube for instructions) and they work great! So the effective speed is only around 1 stitch a second.
Now I sew at a very comfortable speed and I'm practicing various stitch methods (I'm new) and i'm working comfortably at 1000rpms, even though via the speed reducer that's actually only around 333rpm! Hope this helps.