Stuck washing machine tap head

[nowthendiy]

I removed the screw from the head of the tap and assumed that the plastic(?) head would just pull off. I have pulled as hard as I dare but it won't budge. Is there something that I am missing?
Thanks

 

[terryplumb]

Probably just stuck on the splined shaft with limescale build up.
Why are you removing the head ?

 

[Harry Bloomfield]

A piece of timber/wood, to act as a lever, between the pipe/tap base, and the arms of the head of the tap should shift it.

 

[nowthendiy]

terryplumb, the tap is leaking when it is opened. So, I was wanting to replace the rubber o-ring that is around the spindle.
Anyway, thanks chaps. I just needed to know that I wasn't trying to remove something with force that is incapable of being removed.

 

[Madrab]

Undoing the screw should allow the head to be pulled off so it's just stuck on and will need a bit of effort, just support the tap/pipe when you do it to avoid bursting anything.