The Dryer is not Squealing- It is SCREECHING FOR THE ENTIRE CYCLE...

There are a few causes for this. One is the main bearing, video below to show repair.
Squeaky Noisy or Screeching Dryer

Second is the drum rollers themselves, I use a heavyweight oil on the shaft and it cures it on mine for a couple years.
Fixin My Noisy Squeaking Kenmore Clothes Dryer

It is the dryer drum drive belt and the dryer drum bearings

If your dryer is the kind with rotating drums, might be a bearing. You should disassemble it and check if can be replaced
Dryer Repair Replacing the Drum Bearing GE Part WE3M26

Dryer Repair Replacing the Rear Drum Bearing Assembly Frigidaire Part...
Dryer Repair Replacing the Rear Drum Bearing Kit Part 1 GE Part WE25M40

GE Dryer Repair Noisy or Screeching Rear Drum Bearing WE25M40

you can fine more youtube video tutoriala looking in google for terms

Youtube DRUM DRYER

Replace the belt - it is old and worn out. The belt is made of rubber and is slipping, causing the smell and squeak. The belt heats up and becomes more flexible after the dryer runs a while; this is why the squealing stops.

could be your pulley or rollers or the motor itself you have to take the entire unit apart and visually inspect where the noise is coming from could be rear bearing if the model is old enough if you are not mechanical i suggest you call a tecnician hope this helps

The rollers do need oiling but I suspect it to be the drum glides. This dryer is the same as a norge or maytag clickHERE to see how to get into this here dryer.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Hi, this is a belt issue. make sure the tension on the belt/motor is sufficient. adjust to specs. if the belt is fine, this will be bad bearings in the roller assembly.

Replace the rollers in this case.

A little lubricant on the pulleys near the belts will go along way. Its very easy to access these parts front the back of the machine with a 1/4 hex head screwdriver.

Sounds like two problems.

First, the screeching noises are probably from your belt tensioner wearing out and needing replacement. Or the belt is not properly seated on the tensioner and needs readjustment. No biggie there.

BUT...

If you have to keep the start button pressed for the dryer to keep spinning, you may have bad centrifugal switch. That switch is built into your dryer motor. Therefore, the motor will have to be replaced... BIGGIE!

If the dryer model number begins with 417, the drum is supported by a ball bearing in back, and a seal and glides up front. Often, the bearing will become very dry, either from years of use, or from excessive lint blowing up into the bearing. If the bearing isn't cracked or otherwise noticeably bad, you can usually solve the issue simply by lubing the bearing with a high temp grease. While the machine is apart...(a major pain in the butt), make sure to check the condition of the seal and glides on the front panel, and replace the belt if it looks at all cracked or frayed.
If this dryer is not a 417 and/or does not have a rear bearing, it's best to get a maintainance kit (belt, idler pulley and drum rollers) and install all the aforementioned parts, as they are the most likely source of screech. Also, check the motor by spinning the shaft manually with the belt off....if that is squeeking, it's motor
time.