I have an Omega Vertical Juicer I love it it is quiet and easy to clean doesn't clog. I don't use the plunger. I watched a video on line I cut my veggies and fruit in quarters and feed it through I alternate the veggies example kale, cucumber , lemon repeat. I don't over fill it as it empties I fill it again.
I watched this he is long winded but I learned a lot maybe these tips will help you with your juicer.
Hope this helps