power steering pump upgrade advice please

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Well-Known Member
Calllington, Cornwall
Hi folks.
Im struggling with turning the wheels when hardly moving and wondered if there was a more powerful power steering pump than standard that might help!!
I have a 300tdi disco engine in my 90.
My fluid levels are good, have a recon 4 bolt steering box (changed twice now), have a new aux belt fitted and 265/75/16 stt pro tyres .. but when its struggling you do get that horrible whining noise right at the fullest extent.
Any suggestions would be appreciated
You might have changed the box but maybe the pump is knackered or you have an air lock in the system.
Maybe the ujs have siezed up on the steering column.
Collapsed rubber hose on suction side, looks fine but internal limer has delaminated causing oil starvation at the pump.