Snow Blowers

I have a snow blower 1830 hv and when i was using it i noticed that when i had both the drive handle down and the auger handle down at the same time i cant move the the chute position unless i let go and it stops. I had a older blower and if you pushed down on both handle it would lock the others so i could use it one handed and turn the chute. Does anyone no if this should be the same with this blower and is there an adjustment to correct it.
Thanks