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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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P/S Pump swap - line thread depthViews : 1235 Replies : 17Users Viewing This Thread : |
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Sep 24th, 2022, 01:23 | #11 | |
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Quote:
They're going to electric motors on the actual column rather than an electrically powered hydraulic pump Shawn. From what i can work out, they're high torque stepper motors running through a reduction drive to the column, mechanically parallel to it. Because it's a stepper motor, it's going to be under microprocessor control and therefore capable of keeping up with however fast you can humanly turn the wheel so it's just down to the torque which it can alter electronically to give variable assistance. The Americans tend to use higher pressure in their hydraulic systems than Volvo do, my other two beasties (Rover 827 Sterling and Jag S Type) were built for the USA market (the irony with the Rover is ARCoNA pulled the plug as the Mk2 was launched! ) and so have very light steering, certainly at parking speeds. Both also have variable assistance depending on speed so they firm up to almost no assistance at motorway speeds. Granted the Volvo tends to be fairly firm at motorway speeds but isn't much lighter for parking, in fact it's quite a workout by comparison. I suppose it could be argued that Volvo built it to cope with icy roads where the steering feel could often be misconstrued as the wheels not gripping or even the other way round - you think the wheels are gripping but they're just turning in the direction they're aimed without altering the direction of the car. You'd probably also find your steering a bit lighter if you'd renewed your strut top bearings at the same time as the other work, they also have a bearing (no pun intended!) on how heavy the steering feels.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Sep 24th, 2022, 08:37 | #12 |
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This time everything OK but I've got it back from MOT few times in the past with a vibration on steering .years ago that was
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Sep 24th, 2022, 11:42 | #13 | |
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Quote:
On'y seems to be a problem on the Volvo though.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Sep 24th, 2022, 11:43 | #14 | |
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Quote:
This is the new pump; Nothing on the hard line. I'm assuming it's the end of the hard line fitting butting up against the flange you can see within the pump which is supposed to seal it. |
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Sep 24th, 2022, 13:54 | #15 |
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Well I followed the advice and managed to get it seated properly to stop and leaks. Thanks for all the advice guys.
Unfortunately it still judders when turning corners, so I'm going to have to work out a way to more effectively bleed the system! On the plus side - the pulley lines up now. |
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Sep 24th, 2022, 14:36 | #16 |
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Jack up the front end and keep turning it lock to lock slowly but progressively getting faster, see if that does the trick.
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Sep 24th, 2022, 15:19 | #17 |
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Thats good news well done.
As said on the last post Jack it up and with the engine running, progressively turn steering lock to lock. |
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Sep 26th, 2022, 10:00 | #18 | |
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Level of assistance
Quote:
It is not a matter of increasing the hydraulic pressure. During normal driving the pressure is (almost) zero. During steering the pressure will only be a s high as needed for steering, determined by the caracteristics of the spring. Rob |
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power steering, pump, steering |
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