Motor won't work on Champion unless I press on part

Not really. You'll get wet pulp and a big mess to clean, not to mention the waste of your expensive products. Here's why-
Best juicer machines for wheatgrass and leafy greens

Championjuicer.com sells replacement switches. Order the oil seal and o-ring too to save on shipping. Newer models have a safety cut off that does not allow the juicer to turn on unless all parts are properly positioned.

Sorry, but it's not designed for leafy vegetables.
Carrots, apples, celery-yes. For kale, spinach
try a inexpensive, hand powered, wheat grass
juicer. About $50.

I'm having the same problem, the blank screen just doesn't fit the main body that well (I think the body on mine may have been warped by someone putting it in the dishwasher). Since I'm only going to be using my Champion as a front-end for a hydraulic press, I bought some food-grade silicone sealant (from McMaster-Carr or EMI Supply) and I'm just going to permanently attach the blank screen to the juicer body and slide the screen holder over that. There's a new O-ring for the back where the body attaches to the motor that might be needed as well.

nope

you are pushing too hard, this machine likes it slow.

Parts from Champion website. You may need a new cutter, sometimes cheaper on ebay.

sounds like the start of a horror movie. lol

ok dark? and no cracks or leakage from the juice container? hmm

dark .... ...its gotta be juice leaking down and mixing with the dark grease they use on the bearings.. but this is a wild guess. and i cant think of anything else unless a 100 roaches live inside the motor housing.
get it fixed when it starts to whine or smoke.

Hi I had the same problem yesterday and emailed Champion Juicer about the problem here's their reply below, his suggestion worked. Hello Duane, Your machine is equipped with a magnetic start system which will only allow the machine to start when you have the screenholder all the way in place just as you would have it to start juicing. If you do not have any parts on the machine it will not start. Please assemble it again and give it a try. If it still wont start call me at 209-369-2154 for further assistance. Thank you Carl

Hi I had the same problem yesterday and emailed Champion Juicer about the problem here's their reply below, his suggestion worked. Hello Duane, Your machine is equipped with a magnetic start system which will only allow the machine to start when you have the screenholder all the way in place just as you would have it to start juicing. If you do not have any parts on the machine it will not start. Please assemble it again and give it a try. If it still wont start call me at 209-369-2154 for further assistance. Thank you Carl