loader valve not working

[coldstiffy]

Hi need help with new Holland 1620 I added a factory loader valve spool and it works but only when the 3point is getting lifted otherwise the loader will not work I cant figure the problem out the kit has all hard lines so they only fit one way need advice

 

[TX mower]

On my non-New Holland tractor there is a requirement to insert a blind-plug inside the divider block where the aux (front-end loader loader) valve line connects to the tractor so all works correct with the aux valve added. You might look for similar instructions in the workshop manual for your New Holland (it's an easy-to-miss detail in my Yanmar WSM).