ford cargo 813 power steering noise?

My ford cargo 813 H reg power steeringmakes a grinding noise and judders only when i put the right hand lock on/turn right.have check fluid level that seems fine.have look for leaks from pipe but they seem fine.the only place that i could see oil/fluid was out of the top through the cap as its has splash onto the side of the compressor.any ideas would be helpfull
reylem 22, July 2015


done
Hi on my mates ford cargo one of the steering arms on the hub had come loose and that made some strange noises

Geoff hunter, July 2015
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