yeah i got you jan. my appologies.i thought you thought there was a flow divider in the hydraulic pump, like a steer priority valve.

The steering control unit is a rotary valve that controls the movement of the steering cylinder. The supply of oil for the unit comes from the steering hydraulic pump. The control unit has a minimum restriction to oil flow when the steering wheel is not moved. The control unit has four ports. A manifold block is installed on the steering control unit over the four ports. The inlet port in the manifold block has a check valve (steering control valve) and a relief valve and is connected to the hydraulic pump. The relief valve is set at 11.7 to 12.4 MPa (1700 to 1800 psi). Two of the ports are connected to the steering cylinder. The port for the drain circuit is connected to the inlet of the brake valve. All of the oil that flows to the steering control unit flows to the brake valve.

no flow divider on a h7.00xl.separate steer pump. defo steer cylinder seals.

Thanks guys,....... will check the steering pump again...

If the seals steering cylinder are oke, the only possibility can be the steering flow divider,
If the steering flow divider fails there is your problem.
On of the most comment problems is a leak of oil quality I advice to renew at first the hydraulic oil before you will exchange any part.

definately seal bypassing in the steer cylinder. seen it many a time

Ive had this problem with the s70 ft and the s40xm. It was the packing in the steer sylinder both times.It the steer unit was unloaded by jacking up the rear of truck you couldnt make it fail the more weight or rear of truck the more it failed.I found by taking 1 hose off at full cut.The low side of that cut and see if it bypasses.Messy way to see but it works.