How can I remove wand to replace hose on Delta signature series 470 model. Can't "unscrew" wand from old hose.

Could be a loose supply connection or worn, "O" rings in the faucet body.

Are you trying to just replace the sprayer? I replaced the whole unit so cannot help with just the sprayer.

Shut off main water to home. Then check if a clip is guarding the nut to nut threaded connection the use 2 wrenches to un screw.
Cover tools "teeth" with tape or thin rubber to prevent marking on chrome/etc finishes.

Should be able to turn water supply off to faucet and trace the line connecting the pull-out faucet. Remove weight in center on hose line this weight helps retract the faucet head in with the line. Remove it and disconnect the line connection and remove the old one.

Since you are replacing the Delta Faucet Delta 470-BL-DST Signature Single Handle Pull-Out Kitchen Faucet With Spray faucet, bend the water supply lines out of the way, and then use a standard basin wrench to remove the nut.

you need to leave the hose go down the hole and feed it back through when your done

Had the same problem. Contact Delta at 800-345-3358 and they will send out a replacement hose and clip assembly free! Delta has lifetime warranty

To get full pressure you need to pull the wand away from the base. Then remove the wand from the hose becareful not to loose the washer. When the wand is removed look down the wand you will see a plastic part. That plastic part is a flow restrict-er. You need to put a screw in the restrict-er and pull it out. When it is out put wand back on the hose then you will have full water pressure.

You have to buy a Genuine Delta Part because Delta uses a proprietary quck connect fitting at the end of the hose.

This could be a couple of things.

1. First remove the aerator from the wand and make sure you have plenty of flow with it off.
2. If there is flow clean or replace the aerator.
3. Remove the wand and look between the hose connection and the wand there should be a screen between them. Remove the screen and clean or replace.
4. Make sure hose is kinking under the sink.

If you need a diagram of the faucet with part numbers here is the link:

Delta 470

Hope this helps!