I have an Omega Juicer Model 1000. When I try to juice citrul fruit. The jicer may only turn for a second or two than stops. When I push down on the citrus it oftentimes will not operate.

Question edited for clarity, full 'make model (what it is)'.
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Juice content of the fruit you are using. Try with Granny Smith apples and make sure they are this season and not last years. Also try the juicer with oranges to prove it is the apples and not the juicer. Also try peeling the apples as a test. The skin can block the strainer. Another trick, run the discarded pulp again.

https://www.google.com/search?q=Omega+VSJ843Q

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Make sure it is assembled correctly and the latch arms snap shut completely
without any undue force. Also on the bottom of the juicer there should be a
reset button that might have tripped, just push it in. Other wise give Omega
a call.

There is no solution. These juicers do not eject the pulp and go out of balance very easily.
Don't feel bad, I've seen you tube videos where the demonstrator couldn't keep it under
control. If you are unable to master it, consider a pulp ejecting or masticating type juicer.

Try the reset button on the bottom of the juicer.

They all vibrate no matter what you do. Best solution, costly, is to get a pulp ejection
type juicer. Miracle MJ1000 is a nice little juicer for about $130.

call or email omega url:omegajuicersdirect.com

you should quit using the attachment and juice tha oranges the original way wit plunger

There are no instructions. Call Omega 1 800 633 33461
for advice. Also new arms on an older juicer may not
be an exact fit so you might have to do a little filing
down on the arm to get it to fit. You can remove the
4 screws on the bottom to separate the base and get
a clearer picture of what you have to do. Basically
you have to pry the base of the arm away and push
up to remove it. If you're not handy you may need
some help cause it gets tricky.

The plastic top doesn't come off. Together, it's just a piece that you use to push the fruit down into the chute.
Good luck.

DIFFICULT TO USE. SHOULD HAVE GONE
FOR THE 4000 WHICH EJECTS THE PULP.
SOMETIMES THE BLADE JUMPS UP AND
CUTS THE BOTTOM OF THE CHUTE IN-
CREASING THE GAP BETWEEN THE BLADE
AND CHUTE BOTTOM. INSPECT AND I YOU
NEED A NEW COVER CALL OMEGA AT 717
561 1105.