New Jack option.

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Originally Posted by cjc_td5

Hi Tombie.

Why did the threaded rod bend? It should be under TENSION when the jack is loaded?



Chris

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I know. [emoji15]

You can see here the grease still on the thread - that's as far as it was extended...
https://www.aulro.com/afvb/images/im...016/09/550.jpg

There was a light jolt.. that was the hint to get away from the vehicle.

There is no noticeable thread damage I can see.

And then the jack was ejected out from under the rail and down it came.

Everything was done by the book.

Even when lifting it I lowered and reset the jack to get it positioned perfectly.

The parking bay was bitumen and level, front wheels chocked..

It had me a bit puzzled and I still can't explain it.

Fair to say I went out and got a 2 stage bottle jack the next week...

Quote:

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Originally Posted by cjc_td5

Hi Tombie.
Why did the threaded rod bend? It should be under TENSION when the jack is loaded?

Chris

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I think its due to the angle of the jack at full height. As you know the vehicle lifts in an arc, not straight up. This puts a sideways load on the jack which must put enough compression load on the screw to buckle it.

Cheers,
Jon

I don't know how LR get away with it as it is definitely a major safety risk.

I wonder how it would go if the vehicle was fully loaded?

Quote:

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Originally Posted by jon3950

I think its due to the angle of the jack at full height. As you know the vehicle lifts in an arc, not straight up. This puts a sideways load on the jack which must put enough compression load on the screw to buckle it.

Cheers,
Jon

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If you put the jack at right angle to the chassis, this would not happen.

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Originally Posted by Nicky

If you put the jack at right angle to the chassis, this would not happen.

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Ever tried it?

Yes, works OK as the stress is directed on both sides of the chassis rail.

It can work OK, but the system is inherently unstable. The higher you go the more unstable it becomes. It doesn't take much to push it over the edge, maybe a little nudge as you're pulling the wheel off, or perhaps if the screw thread isn't quite straight enough making it more susceptible to buckling.

The margin for error is just too low as has been demonstrated on here numerous times. The jack is just not strong enough and to me this is the single biggest problem with an otherwise brilliant vehicle. I've used a couple of different hydraulic bottle jacks over the years and whilst they have been a big improvement over the standard jack I still haven't been happy with the process. In fact it was enough to convince me to get a Defender after having a heart attack while changing a wheel last year.

Basically you have to lift a very heavy vehicle too far off the ground - unless you lift it under the suspension arm.


Cheers,
Jon

[rant] Actually this is a classic example of Land Rovers Eurocentric thinking. I fear they've lost some of the corporate knowledge about what is required in an off-road vehicle. They see how these vehicles are used in Europe - drive up to your ski chalet in Chamonix or cross a muddy paddock in the Cotswolds to pick up the pheasant you've just shot and if you get a flat tyre you put on your hi-vis vest and call the AA. They've forgotten how the rest of the world works. They don't understand how a vehicle falling off a jack in the middle of the outback can kill you because whenever they go on an expedition they have a back-up crew.

They build the most capable 4wd on the planet and cripple it with a jack that wouldn't lift a ****ing Corolla. [/rant]

Thank you.

Quote:

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Originally Posted by Nicky

Yes, works OK as the stress is directed on both sides of the chassis rail.

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Guys, just try this.

Deleted post :/