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Heavy steering at parking speeds

Posted: Thu Jun 25, 2020 7:31 am
by dks
Hi guys,

Got a problem with the hydraulics.
The basic issue is the steering is unbelievably heavy at parking speeds.

Here's what has been done
  • Power steering pump – replaced with new one.
  • Power steering box – rebuilt.
  • Brake booster – rebuilt.
  • Accumulator – replaced with okay second hand part.
  • Pressure regulator – replaced with second hand part from working vehicle.
  • Oil reservoir – filters cleaned as well as line to pump.
I've just had a test drive and found
  • Braking is quite good.
  • Steering at 60kmph good.
  • Steering at low speed – really heavy – I can turn the wheel but my wife couldn’t.
My mechanic says the power steering pump gets very hot and thinks there is a flow restriction to the power steering pump (even though he has tested the line from the reservoir).

Anyone got any clues where to go next - there ain't nothing left to replace.

regards

Re: Heavy steering at parking speeds

Posted: Fri Jun 26, 2020 10:59 pm
by Fedaykin633csi
Maybe time for a new filter in the hydraulic fluid reservoir?

Re: Heavy steering at parking speeds

Posted: Sun Jun 28, 2020 5:08 am
by dks
Thanks - I think that is a good idea - the filter needs to be looked at.
I don't think it has ever been replaced and I'm sure it needs to be more often than that :D

Re: Heavy steering at parking speeds

Posted: Sun Jun 28, 2020 8:58 am
by plip1953
Is this video at all helpful?

https://www.youtube.com/watch?time_cont ... e=emb_logo

It seems to me that if pressure is available at the steering box input side, but there's no assistance being generated, then the problem must lie with the steering box itself. However, you suggest that powered steering is available at higher speeds so that would suggest the steering box is working, but pressure to it is lacking in certain situations.

Is there a known speed at which assistance begins? Is it gradual or like an on/off switch?

Last time I drove my car (2 years ago lol) I experienced a very strange set of circumstances whereby the steering assistance would suddenly fail, but this was at speed and was never apparent when stationary or at low speed. The brakes worked fine the entire time. My suspicion is some kind of issue with the valve assembly to which the pressure accumulator (bomb) is attached, and I have a secondhand unit to slot in when I eventually get round to it.

This thread may be worth a read...

viewtopic.php?f=17&t=29926

Re: Heavy steering at parking speeds

Posted: Sun Jun 28, 2020 12:54 pm
by dks
Thanks Phil.

The video was a good intro to the operation of these boxes.

Had a read of the thread you suggested - I've read it before but not the same.

There is steering assistance at driving speeds - I guess 10-15 kmph or more. So, I'm not convinced there is a steering box problem yet - but I haven't dismissed the idea either.

As you said, I think I need to do is to determine where the assistance kicks in.
I was thinking if there is no assistance when the car is almost stopped, put it in Neutral, give it a few revs and see if the assistance comes back.

I'll report back in the next couple of days.

regards, Dave.

Re: Heavy steering at parking speeds

Posted: Wed Jul 01, 2020 2:28 am
by emac
does revving the engine change the PS assist? What does it feel like going lock to lock sitting still? Does it make noise?

Mine made some funny noises and I changed the filter and it helped. Fixing the broken steering box mount was also a big improvement.

Re: Heavy steering at parking speeds

Posted: Wed Jul 01, 2020 4:10 am
by dks
Hi emac

Just spoke to the hydraulics guys and they say just a few revs makes it all okay.

Seems like the PS pump isn’t giving enough pressure sometimes.

So I’m thinking the “new” PS pump isn’t so good.

No noises - we’ll just a bit at extreme lock.
Also mounting fixed ages ago.

Will certainly replace the filter soon too.

Re: Heavy steering at parking speeds

Posted: Tue Jul 07, 2020 11:29 pm
by emac
Are you using the same size pulley on the new pump as the original?

Re: Heavy steering at parking speeds

Posted: Thu Jul 09, 2020 8:12 am
by dks
Hi emac,

As far as know - yes.
I drove the car yesterday and it was all okay.
I am told that the new PAS pump was generating enough pressure at idle and caused a valve in the regulator to not close off properly. Also, just a few more revs (up to about 1000) and everything is okay.
Again, I am told that the new pump was pulled apart and there was a little wear because of lack of flow and that is was rebuilt and now all okay.

I hope to get the full story in the nex few days and will report back.

The poor thing has been off the road since beginning of March - seal kits with missing seals, COVID-19 delays to deliveroes from UK to OZ, then the local couriers hacked and delivies taking another 2-3 weeks etc, etc - but it was nice to have a drive again.

Re: Heavy steering at parking speeds

Posted: Thu Jul 09, 2020 8:17 am
by plip1953
dks wrote: Thu Jul 09, 2020 8:12 am
....... the new PAS pump was generating enough pressure at idle ......
"was or "wasn't"?

Re: Heavy steering at parking speeds

Posted: Thu Jul 09, 2020 9:54 am
by dks
Sorry - wasn’t