Hi Japer,
I am not sure if it will work on the nevara but you may have air in the power steering system, on a lot of motors this can be removed by turning the steering full lock then full lock the opposite way but be carefull when you tweek the adjustment screw I once over done it on a LDV van and the steeing box snapped ......luckily I was stationary and just pulling out of a pub car park space......100 metres down the road was a busy roundabout on my route home