MAN HIGH ALTITUDE EXPEDITION - Mercedes-Benz Forum
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post #1 of 22 (permalink) Old 05-10-2019, 06:44 PM Thread Starter
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MAN HIGH ALTITUDE EXPEDITION

OK, MAN trucks, not UNIMOGs, but an interesting foray up into the high Andes. They trucked some pre-fab Rescue huts up the hill and set them up, etc.

Of note are the Snow Chains on the Rears. There are snaps and catches that live on the wheels, and the chains consist of individual lengths of chain that attach to these fixtures.
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post #2 of 22 (permalink) Old 05-10-2019, 06:47 PM Thread Starter
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post #3 of 22 (permalink) Old 05-10-2019, 06:50 PM Thread Starter
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post #4 of 22 (permalink) Old 05-10-2019, 06:53 PM Thread Starter
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post #5 of 22 (permalink) Old 05-10-2019, 06:56 PM Thread Starter
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post #6 of 22 (permalink) Old 05-10-2019, 06:59 PM Thread Starter
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post #7 of 22 (permalink) Old 05-10-2019, 07:21 PM
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Chaining up must take forever but its a cool idea, as little or as much chain as you need I guess.

I assume the forest of spires is glacier and not salt?

-= Francis =-

These, in the day when heaven was falling, The hour when earth's foundations fled, Followed their mercenary calling, And took their wages, and are dead.

Their shoulders held the sky suspended; They stood, and earth's foundations stay; What God abandoned, these defended, And saved the sum of things for pay.

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post #8 of 22 (permalink) Old 05-10-2019, 11:22 PM Thread Starter
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Yes, those chains are interesting, but I might stick with the conventional Heavy Duty Pewag type.

It could be that these were specifically designed for this expedition, but I sort of doubt it.

The advantage to the conventional chains is that, aside from finding the inside links, and choosing the right one for the correct fit, one does not have to spend much time under the truck, messing with inside of the wheel/tire. The chains can be draped over the tire, shuffled around to get them situated, then it just remains to complete the connections, by whatever technique works best for the chain/tire/truck combo.

With this system on the MAN trucks, each and every chain has to be connected by hand twice, half of the connections being made inside the wheel to the red clips, and the other half on the outside. It is unclear what the tensioning system is, but it is safe to say that each chain would need to be adjusted individually.

After a day in mud, or frozen slush / gravel and Ice, I imagine that getting under there to unclip every red clip to get the chains off would be a pain. I count 18 chains per tire, so each tire has 36 connections to make, on or off.

On the outside of the wheel, the hub area looks very crowded, and it is crowded with chain links - it looks like the perfect nest for a well-frozen ice ball, in my neck of the woods. The kind that needs a kettle of hot water and a claw hammer to free up.

Next, the wheels are carrying all of that extra hardware, whether they are chained up or not. Increased unsprung weight, and potential balance problems come to mind, and the red clips, at least, look like they might be prone to damage in the rocks they are driving in. Since each chain relies on a red clip for the inside anchor, if you break or smash one, you might wind up with no chain for that area.

In the photo with the guy that has a chain over his shoulder, it appears that the fastening hardware is captured by a rim, but it is free to slide around the circumference, as evidenced by the gap in the hardware. This can be seen in the photos without the chains mounted, and if the exterior system can slide, maybe the inside red fasteners have the same
provision. Just layers of increased complexity, compared to conventional chains.

So, I see some potential disadvantages with this system, but I don't see any advantages.

With conventional chains, you usually have just two points of connection, plus the tensioning springs/chains. If you tear them up a little bit, with spare links and a small amount of chain (if necessary), you can make field repairs.

With this new system, you can repair the chains as normal, but if the damage is to any of the 36 fasteners per tire, you might be SOL out in the field.

Plus, the way they have it set up, they can't run these chains on the front wheels, since they are not loaded down with any of the hardware. If you want chains on the front, you'd have to swap wheels.

Plus, I like the tightness and stability of the basket style of chains, as opposed to this system with just the lateral rows of individual chains...

But who knows, maybe I'm missing a lot of somethings, and they are the best thing since sliced bread ?
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Last edited by TRUKTOR; 05-10-2019 at 11:45 PM.
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post #9 of 22 (permalink) Old 05-11-2019, 06:57 AM Thread Starter
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Following the "Grizzly Snow Grip" logos on the MAN trucks led to some photos from the chain manufacture's site.

The system on the High Altitude MAN trucks looks different and more heavy duty than their commercial offerings.

On the Road Going system, there are no Red clips on the inside of the rim. Instead, the chains are fished through the holes in the rim by using a hook, and then grabbed by a hook on the adjuster. Something best done in a warm shop, rather than outside in the elements. (Also true for all snow chains, admittedly).

They also show the chains installed on only the outer wheel of a dual rear wheel set-up, so you then get to fish the chain between the tires and through the holes. One good thing is that most UNIMOGs have solid rims, so we are saved from this. Certain 8 and 10 lug UNIMOG owners can probably give them a try.

If UNIMOG owners with solid rims want to participate, then I suppose that is what the Red Clips are all about - how to make the system work when there are no holes in the rims.

Photos.
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Last edited by TRUKTOR; 05-11-2019 at 07:07 AM.
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post #10 of 22 (permalink) Old 05-11-2019, 07:03 AM Thread Starter
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More Chains.
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