300Tdi Power Steering Pump

[Troll Hunter]

Can somebody please tell me which way round the grooved cylinder and spring should be re-fitted into my power steering pump.

I had a fluid leak from the joint between the pump body and the high pressure hydraulic adapter that fits into the pump body and retains these in position. They fell out when I removed the adapter, and I've no idea which way they should be re-assembled:unsure:.

The O-ring on the adapter was shot, hence the leak. There's also an O-ring beneath the flange that secures the low pressure connection to the pump. That was toast, as well.

Many thanks for any much needed guidance, since there's nothing on pump overhaul in the manuals that I've got.

Mike

[Troll Hunter]

Hey, guys, this is getting me really worried:huh:. Has nobody ever taken a 300Tdi power steering pump apart? Please, I'm getting desperate:unsure:!

The attached file shows the parts that have got me stumped!

If there is no "forum knowledge", does anybody have an LR Tech help contact, please? There aren't many LR experts in this part of the world - rural BC, Canada!

MikeSteering pump parts.pdf

[dirtyninety]

I wouldn't worry, somebody with an answer will be along shortly

I know what the spring and groove etc is all for... but im unfamiliar with the pump, having never taken one apart!

[piper109]

I have never taken apart my steering pump though I do in fact have a 300tdi Disco....rare in US.

Looking at the picture, it would seem that the only real challenge is to put the spool back in the right way and have the spring in the right place.

These 2 components make up the pressure relief valve which when the pump deadheads on one lock or the other, it allows the oil flow to go back to the tank or the feed line from the tank, with the familiar squeal. The oil will build up its maximum allowed pressure and as it has nowhere else to go it forces the spool over against the spring and this will allow oil from a hole which is normally closed off, to open and allow oil to travel to another hole. You may be able to work this out by peering into the spool bore and ascertain if it the long end or the short end which does the work. Based on my experience with many hydraulic components, my guess is that the long plain diameter provides guidance for the spring and the spring is held in place by the retaining cap. The cap will be bored ot on the inside and the spring can seat in this hollow.

In other words, drop the spool in, short end first, place the spring over the longer spigot and fit the cap. The spring should become compressed by tightening the cap. Probably if incorrect assembly is attempted, it will seem very wrong and things wont feel like they are going together right

If its right, the steering will work normally. If its wrong, you will get no steering assisting force as the oil will be circulated back to tank without building pressure but no damage should result.

Hope this helps,

Steve

[Troll Hunter]

Dirtyninety and Piper109,

Many thanks for your replies, but I'm still amazed that it seems nobody has stripped a 300Tdi power steering pump, and is able to provide a definitive answer. I don't think that I've ever been the first person to do anything !

Unless somebody does come along with positive knowledge, I'll add to this post the details of what I did, and the results, good or bad.

Mike

[Troll Hunter]

At last, I've got a definitive answer, although this appears to be a "non-serviceable" component, and no details of the pump internals appear in any LR WSMs!

Referring to the photo, the spring goes into the pump body first, followed by the small, grooved cylinder/piston, bottom centre. This goes in with the end with the small hole in it first. The HP adapter, top right in the picture, holds this in place against the pressure of the spring.

Many thanks to Julian and Chris Bird, of Bedw Services, in Dyfed, for finding a spare pump and stripping it to confirm the orientation of the components. These two are absolute stars, with Land Rovers being in their DNA!

Many thanks, also, to all others who have been puzzled by, and trying to resolve, my dilemma.

Mike

[NegevLandRover]

At last, I've got a definitive answer, although this appears to be a "non-serviceable" component, and no details of the pump internals appear in any LR WSMs!

Referring to the photo, the spring goes into the pump body first, followed by the small, grooved cylinder/piston, bottom centre. This goes in with the end with the small hole in it first. The HP adapter, top right in the picture, holds this in place against the pressure of the spring.

Many thanks to Julian and Chris Bird, of Bedw Services, in Dyfed, for finding a spare pump and stripping it to confirm the orientation of the components. These two are absolute stars, with Land Rovers being in their DNA!

Many thanks, also, to all others who have been puzzled by, and trying to resolve, my dilemma.

Mike

Sorry, just seen this.

The pump is not meant to be serviced and is not worth the trouble or the risk. Risk is in that the pump wears away and the spindle breaks causing the belt to let go and before you know it you have no fan and over heat. If this happens while you are on a highway travelling in a straight line the engine will probably over heat before you realize that you have no power steering.

The steering box is also not really serviceable. I once bought an overhauled steering box and regreted the "saving" as it ended up being more expensive than a new one.

Adam

[Troll Hunter]

Adam,

Thanks for your advice, and I agree that a replacement pump is the way to go, in the event of pump failure. I haven't actually serviced the pump. I removed it only to replace a failed O-ring in the HP discharge. Job's done, and I'll be testing it tomorrow .

Mike