When I start my juicer it runs very slow for about 15-20 seconds. Then it speeds up. What is wrong with it?

Sounds like the shaft bearing is going out.

You burned out the motor. Get a new juicer.

When juicing with the champion juicer take it slow. You need to hold down the tamper for three to five seconds in-between reloading the chute. Otherwise it will begin to back up through the chute and the juicer will begin to heat up. Happy juicing! LivingaHealthyandHappyLife.com

You may have tripped the reset button on the bottom of the juicer, just push
it back in. They really don't have to warm up, just give it a few seconds to reach
speed.

The motor sounds like it overloaded, I doubt it has a thermal cutout fitted (in which case you could leave it off for a while and see if it works) I doubt it has this feature and if it is the motor then the unit should be replaced.

1-973-287-5150. VERY SHORT WARRANTY. IF OUT
OF WARRANTY GO FOR SOMETHING BETTER.
GOOGLE FERNS NUTRITION, THEY SELL JUICERS
AND GIVE GOOD ADVICE. I HAVE AN ACME SINCE
1990 AND RUNS LIKE THE DAY I GOT IT. TAKE A
LOOK AT THE LEXEN GP62. THE HUROM SLOW
JUICER IS GREAT, BUT BIG BUCKS.

THIS IS A NON EJECTION PULP JUICER AND THEY
WILL VIBRATE LIKE MY ACME. BEST FOR HARD
PRODUCE LIKE CARROTS, APPLES, CELERY ETC.
FEED PRODUCE SLOW AND STEADY.

I have a brand new one from Costco and it goes through carrots very quickly.

FIRST DUMP THE FILTERS, THEY DECREASE YIELD AND MAY CAUSE MORE VIBRATION.
IF JUICER SHUTS DOWN PUSH RESET BUTTON ON BOTTOM. THIS TYPE OF JUICER DOES
NOT EJECT PULP AND REQUIRES SOME TIME TO MASTER. FEED THE STUFF SLOW AND
STEADY. WANT A GOOD JUICE? TRY 1 APPLE, 2 CARROTS, 2 CELERY AND A HALF LEMON.
IF YOU ARE REALLY BRAVE YOU CAN FINISH OFF BY SLOWLY POURING 6 OR 8 OUNCERS
OF WATER RIGHT DOWN THE CHUTE. THIS NOT ONLY DILUTES BUT LEECHES MORE JUICE
OUT OF THE PULP. JUICE SHOULD BE DILUTED AND DRANK SLOWLY.

the blade is no on right