Installed a grohe k4 faucet and it will not retract back into neck of faucet. is the spring directional?

try this link

copy and paste

https://www.youtube.com/watch?v=pxQaL1wpf0U


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screen filter needs cleaning or a replacement.

Grohe has a special tool that is used for installation that comes with the faucet. You have to remove the pullout spray and remove the curved neck of the faucet by pulling out. Insert the tool in the main body and tighten from above. Most plumbers will keep this tool when installing. I don't know if Grohe still uses the same system still today, but they did in the past.

Install a new cartridge assembly. Contact Grohe and ask them for free replacement parts.

you can pull the faucet arm off, the part right on top of the base , if my memory serves me correct you can tighten it with a creset wrench and the neck will pop right back on after

check out the spring on the hose under the sink, sometimes they come loose on one end and they lose their spring back into the faucet

Take a drinking straw, crush one end and push it down the retracted neck, gently twist and pull and hopefully it will stick to the straw. If you need something stiffer use a disposal chop stick and place it in the end and try that. I carry thousands of dollars or tools and equipment on my trucks but sometimes its still best to improvise. Good Luck!

i have solution please send me photograph clearly

I hope this helps.
Step11Turn off the water supply. You'll find a shut-off valve under your kitchen sink. Once the water is turned off, open up the kitchen faucets to allow the water remaining in the pipes to drain way. Step2Catch the drips by placing a bucket under the hot water supply line, located on the left side of your sink. Even a minimum of water can cause a mess and be potentially damaging. Step3Use a wrench to remove the compression nut that secures the hot water supply line. Let the disconnected section fall into the bucket. Use the wrench to loosen and remove the nut at the other end of the line and remove it as well. Step4Repeat Steps 2 and 3 for the cold water supply line. Step5Replace the cold water supply line. Hand-tighten the nuts on both ends, then use the wrench to tighten the nuts completely. Repeat the process with the hot water supply line. Step6Turn on the water supply and test for leaks

There should be an o-ring on the mating surfaces of the hose and the faucet that my be missing.  It could also me that the big washer in side of the faucet (under the cartridge) has been shifted.  
I doubt it is the cartridge itself, always try the cheap ideas first.