This happened to me before. I put the grease seal in the hub smooth side out and sharp lip of seal towards hub. Doesn't like to go on the spindle that way. The tension spring wants to come out of the seal and get all tangled up on the spindle. Turn it around with the sharp edge towards the car and slips on great. Which way does it say in the manual?

BTW, this is a cross post from Pelican. I used to think that they had a technical section, but with no reply to this rather technical question, I bring it here. Thanks.

Edit: I found out that the correct way is with the sharp edge towards the car and with the spring side towards the hub. It's backwards from an engine seal.