Scrambler 500 4x4 problem

[kfx400110238]

My brother has an 04 Scrambler 500 4x4. The other day I was riding it in the snow and I notice when I had it in 2wd and would give it a lot of throttle, 4wd would engage. Never did this before. I know when the AWD button is on and the rear tires spin/ loose traction its supose to engage. The whole time we've owned it, once we put in AWD, it's all time 4wd, it wouldn't engage when the tires spin. I dont know if it's supose to be like this or what. Any ideas?

Thanks

[rundrave]

drain the front hub fluid and refill, repeat if necessary

[kfx400110238]

Ok. I'll go give that a try.

Thanks a lot.

[kfx400110238]

So I tried that and it helped. Still engages, just not as much. Tomorrow I'll drain it again and see what happens.

Thanks again