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Old 08-27-2019, 06:44 PM   #1
chopperead
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Default Power steering judder

UK 940 turbo

Had judder from steering so changed pump to new remained one no joy.

So also changed steering rack to new remained and still have a judder when parked up and on slow hard turns.

Any ideas on what to look out for as this has gone on to long now.

Much appreciated
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Old 08-27-2019, 06:50 PM   #2
hiperfauto
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Have you checked the harmonic balancer/crank pulley? It's common for them to slip at the rubber isolater.



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Old 08-27-2019, 08:20 PM   #3
Mr. V
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How would a bad harmonic balancer cause "power steering judder?"

The HB is separate from the PS pump and steering assembly.

When they fail the cars performance suffers, but I cannot see how it would affect steering.
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Old 08-27-2019, 08:23 PM   #4
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When the pump is under a load the pulley will slip, then grab causing a judder.
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Old 08-28-2019, 01:24 AM   #5
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I have a spare I can try or first can mark liner above. Thanks for the info.
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Old 08-31-2019, 05:35 PM   #6
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Balancer was fine no slip.

Just played around and it's still struggling.

When I was bleeding system on sale stands I was going lock to lock no problem.

Now I can't even get lock to lock it seems like it's blocked and is restricted by about 40%.

Like I say new track and pump wtf !

Please please help me fix this.
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Old 09-01-2019, 12:09 PM   #7
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Just for kicks, have you checked the u-joints on the steering wheel shaft?
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Old 09-01-2019, 04:57 PM   #8
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What do I look for ?
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Old 09-02-2019, 08:26 AM   #9
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It's a bitch but you probably take it off and feel if it's smooth and articulates as it should. You could try spraying some pb blaster or the like on it and try to notice a difference in the steering...maybe...
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Old 09-02-2019, 01:34 PM   #10
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How's the belt? Old and shiny can slip, even if properly tight.

Supply hose from the reservoir to the pump in good shape? Rubbery and not hard as a rock? It's possible for a hose clamp to be slightly loose, or the hose too hard to clamp properly, and allow air to be sucked into the pump. That could cause "judder" without loss of fluid.

Quote:
Just for kicks, have you checked the u-joints on the steering wheel shaft?

What do I look for ?
Up in the air, engine off, slowly turn the wheel lock-to-lock, feeling for any binding. If one of the joints is getting stiff, you'll feel resistance at a few spots on the way around, usually 180 degrees apart... loose-tight-loose-tight-loose-tight.
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Old 09-02-2019, 06:52 PM   #11
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Some good things to try there thanks much appreciated.

This whole episode started when I took the pump fed hose of to get to something and although I clamped it off it obviously list some fluid and gained done air in system and since then I've been unable to get rid of the judder.

Think I will grab a new hose for good measure and will grease up the Uj's.

Much appreciated
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Old 09-03-2019, 05:43 PM   #12
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Did you bleed the steering system? You bleed it by putting the car on jack stands and rotating the steering from lock to lock gently about 10 times.

I know others dont' believe in snake oil. But I do and have had positive experience with Moly Slip additive in steering racks.
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Old 09-04-2019, 05:46 PM   #13
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Trust me I went over kill on the bleed.

Engine off lock to lock endless times
Fuel fuse out cranked for short time then lock to lock
Repeat advice few times
Then cranked with no fuse while lock to locking
Then fuse in and started turned off shortly after checked for bubbles and then lock to lock
Then started let get warm then lock to lock

Fluid is nice and clean especially as been flushed so many times recently and wasted litres of power steering fluid.

Still haven't had chance to test above.
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Old 09-04-2019, 06:46 PM   #14
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The engine should be idling when you bleed the power steering system. Up on jackstands idling. Go lock to lock ten times. Idling. The pump must be running to pump the fluid and air to the reservoir where it can leave the system.
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Old 09-06-2019, 01:17 PM   #15
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Yep done it loads with engine running aswell on stands.

Gonna be looking at this tonight.
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Old 09-06-2019, 01:24 PM   #16
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I have a similar issue, about to look at the balancer. When you checked it, did you mark it with paint like hiperf shows? It would be hard to notice relative movement of two objects rotating at 15 revolutions/second without some form of paint indicator....
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Old 09-06-2019, 04:37 PM   #17
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Yep marked it with paint no movement.

On stands with engine off lock to lock no binding or issues at all.

Slight residue around feed hose into pump so not sealing perfectly unsure how to improve this, new hose is Volvo only £50 part.
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Old 09-07-2019, 06:39 PM   #18
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I think my issue might be related to the exhaust supports, since my exhaust doesn't have a flex joint. Raise your car and wiggle (with decent force) the front muffler/resonator- mine would shake the transmission, indicating the need for either stiffer trans mount or better exhaust supports, or flex joint. I think the steering load would make the system vibrate at a harmonic of the system... the mounts are solid rubber, not tuned hydraulic ones that are on modern cars...

Just more ideas for you to check as I continue to explore mine's symptoms
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Old 09-09-2019, 04:45 AM   #19
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On testing this problem ive encountered a separate oil leak that i need to sort first, so i wont confuse this post with a different issue but will be picking this issue up again later.

Thoughts though are that i will look to replace the hoses as these are the only thing unchanged.

Which hoses could cause the judder all of them ?

Im finding it difficult to find the hose that goes from the reservoir to the power steering pump (presume this is called the feed hose ).

Obvious can go to Volvo but its £50 which is crazy especially as its not a banjo type hose just plain hose has anyone used a generic hose or an alternative ?
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