volvopaul
Well-Known Member
Maybe Daka has done thousands of hours on Volvos but he is no mechanic as his post clearly illustrates, has he ever actually bled out a DPH system, I think not judging by the tosh in his post, there is no pressure from the power steering pump up at the helm as this is purely a low pressure (hand powered) hydraulic system which operates the shuttle valve at the rear on the transom shield, this then controls the high pressure from the servo pump down to the cylinders. If any oil blows back while filling this is purely air coming up the hoses and is directly proportional to how fast you spin the wheel while filling, I have done this operation at least 50 times and we always run the engine to help purge the cylinders of air.
It isn't as dramatic as he makes out, you get plenty of warning as as soon as the oil level in the helm gets low you get a clicking sound from the helm pump and the wheel feels notchy, you can top up and keep going, the oil doesn't leak so fast that you instantly lose the steering as he implies.
I am sure Volvopaul will confirm this.
I quite agree with you on that one