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How to Repair and Rebuild a Delta Single Handle Kitchen Faucet 

On this page I am going to show you how to repair a Delta Single Handle Kitchen Faucet number 300 Without a vegetable sprayer and The Delta 400 that comes with a Vegetable sprayer.

Delta 300 As Always Make sure you have turned the water off first. Turn the faucet on to be sure there is no water coming out of of it.
First get a delta repair kit from any plumbing supply. If you have a vegetable sprayer you should get a new diverter also. This is all you will need, Plumbers grease (do not use any other type of grease), your repair kit and your diverter.
Delta 400 This is what comes in the kit Make sure you get the kit with the ball included some come with out but you can buy the ball separately.
Delta 500 b This Is the diverter. It comes in plastic or brass.


The last thing that has to be removed are the O rings pry them away with a small screw driver.  Now there should be no parts left in or on the faucet. Make sure there are no rubber parts of washers or o rings left inside the brass.
Now lets put it back together with the new parts. Compare your old O rings with the new ones. the kit comes with two thin and two thick O rings so make sure you use the same type that you took off. Most use the thicker ones. Take A little grease on your finger and very lightly coat all the rubber parts and the new ball.
After it is greased put the new O rings on the brass post in the grooves you took the old ones off of.
Put grease on the diverter o ring (some don't use o ring, if old one has one, use it if not, don't) then push the diverter in as far as it will go.
Now put a little grease on the inside of the spout And put the spout back on turning left to right as you gently push down. If it will not go all the way down, the diverter needs to be pushed in further Or the o ring need to be removed from the diverter.
Now the little rubber seats and springs make sure you compare them to the old ones you took out and use the right ones. note that the thinner part of the spring goes into the rubber seat and the wider side sits inside the faucet It should look like this Don't forget the grease.
Don't forget to grease the ball. Note the slit in the side of the ball. There is a small pin inside the faucet on the right side. It does not show up so good in the Pictures. the slit on the ball has to go on to that pin.
The rubber washer goes inside the white plastic piece Don't forget the grease. Notice the little grove in the faucet and the little nub on the white plastic make sure the white plastic stays there, You may need to hold it down till you get the top nut on and screwed down enough to hold it in to place.
To adjust tightness on the handle and if it leaks out of the top use the tool that comes with the kit to adjust. the handle should feel free and move very easy. Replace the handle And turn the water back on to test You may want to remove the aerator (the screen At the tip of the spout ) Before turning the faucet on to flush the faucet out then put it back on.
It's normal to have 2 o rings and 2 sets of springs and seats left after you are done.

Please read the feedback I received.
Thanks very much for your informative page outlining comprehensive steps for overhauling a Delta ball faucet! 
After an exhaustive search of the web, I found plenty of websites telling how to do a basic Delta overhaul to remedy leakage.  However, none described the Delta faucet's diverter element and how to remove it.  After following your instructions, I discovered the reason why my faucet has been mysteriously  reducing its water flow before finally shutting down altogether recently. 
Replacing the seals, springs, ball and other assorted parts did nothing to remedy the problem.  With the insight from your web page, I removed the diverter-- which was defective -- and the good times rolled again.
A good part of my day was spent on this very frustrating project.  Now, I feel I have accomplished something and learned a hell of a lot about fixing faucets. 
My deepest appreciation and thanks, Sincerely

I just wanted to thank you for your wonderful description of how to
change a delta faucet.  We just moved in to this place and the bathtub
faucet was leaky.  I was having a really hard time fixing it when I
decided to Google some help.  The pictures were a great help.  I wanted to say thanks. 

Delta Single Handle Faucet
Delta kitchen faucet

With the tool that comes with the kit loosen the Allen key nut to remove the handle. once loose enough it will just pull off.

With The Handle off remove the nut (be careful not to scratch the finish) Now the ball can be lifted out, you can through the ball and white plastic piece away .
This is what is left two rubber seats and 2 springs use a small screwdriver or some thing t remove them. They are just sitting there.
Now remove the spout, Just move it left to right while pulling up it should come right off.
Notice In the front there is a round thing there That is the diverter. you will need to pry it out with a small screw driver.
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