Unimog 404, What is the Leaver For?? - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 07-13-2015, 02:47 PM Thread Starter
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Date registered: Jul 2015
Vehicle: 1959 Unimog 404.1
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Unimog 404, What is the Leaver For??

Hi all
I am a fresh Norwegian Unimog 404.1 owner
I got it a few days ago.
Its been standing still for the last 10 years. Until i got my claws into it.
I am a Unimog & Offroad Newbie. But i love them. They are badass

In my 404 i have a mysterious leaver that is not showed in the glove box manual. Nor can i find anything about it in the forum.
Maybe its my searches, or maybe everyone but me know this :P?

According to label, its a reverse leaver.
But there cant possibly be 2 reverse leavers..?
See attached picture.

Found a youtube film showing the very same leaver.
But he does not say what its for.
He is holding his fingers on it at 3:40s

Leaver :

Hopefully you guys know what its for?
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post #2 of 14 (permalink) Old 07-13-2015, 03:14 PM
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Crawler gears!

At least I think so... never actually seen one installed. Looks like the handle has been bent to the side. I believe rotating counter-clockwise puts you in normal range, clockwise to put engage crawler gears.
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post #3 of 14 (permalink) Old 07-13-2015, 03:15 PM
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Crawler gears just like the video title says. Hehe
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post #4 of 14 (permalink) Old 07-13-2015, 03:22 PM Thread Starter
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Hi.
Thankyou for quick response.

Is that the crawler gear?
I would have loved if that youtube guy explained that alittle bit more.
To me that didnt exactly get expressed clearly :P

Read about those in the manual.
But it did not show the leaver on the picture in the manual.

And from the looks of some threads i have been reading.
It looks like they are not very common on the 404s?
Maybe thats why they did not show it in the manual..

Atleast a nice bonus.
I guess i have 8 gears instead of 6 then
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post #5 of 14 (permalink) Old 07-13-2015, 03:53 PM
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Yes, crawler gears are fairly rare in the 404. It's on page #19 and #25 of the 404 "Glovebox Manual". Even more rare, there is a standard 2-speed crawler, and apparently a 4-speed crawler. No idea how you tell the two apart.
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post #6 of 14 (permalink) Old 07-14-2015, 02:48 AM
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The two speed crawler has 2 speeds. The 4 speed has err... you get the picture.

Remember that the crawlers are comparatively weak, don't go bouncing over rocks with them. To select the gears, IIRC put the forwards / reverse lever in neutral (so in 1st / 2nd gear on the main selector), then you can engage crawlers, then select 1st / 2nd. If there's a second indent on the crawlers you'll have the 4 speed (2 speed in reality, you're selecting the other gears with the main selector.

If you do the 8 speed conversion (very simple) with the backwards H pattern (not needing the other lever) then you'll have, if it's the 2 speed crawler, 4 lower ratio gears, and if it's the 4 speed, 8 lower ratio gears.

sooo - do the 8 speed conversion!

2 speed crawlers :-

4 crawlers with reverse
4 low with reverse
4 high without reverse

4 speed crawlers :-

4 ultra low with reverse
4 low crawler with reverse
4 low with reverse
4 high without reverse

If you want to have a laugh, remove the reverse interlock to add another 4 gears. Now that's how you make a 404 with a 16 speed gearbox


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post #7 of 14 (permalink) Old 07-14-2015, 05:02 AM Thread Starter
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Kind of weird that the previous owner of my mog labeled this leaver as reverse..
Never struck him as weird with 2 reverse leavers maybe..:P

I will need to find out if its the 2 or 4 speed that is installed

As the step 1&2 is the working gears of the gearbox.
I guess it is the 1&2 gear that is used 2 times for the four speed.? The 3&4 crawler gear is just moving the crawler gear leaver another step, an using 1 & 2 again?
(Or is it 3 & 4 gear that is used with main leaver? I would have thought that would really mess up everything, as the 3&4 have very different ratios..?)

If i want 1 crawler gear=I put gear box in Neutral, engage crawler gear leaver one step, engage 1 gear with Main leaver.
If i want 2 crawler gear=Engage 2 gear with Main leaver.
If i want, (and have 3 crawler gear)= Engage crawler gear leaver another step, engage 1 gear with Main leaver.
If i want, (and have 4 crawler gear)= Engage 2 gear with Main leaver.
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post #8 of 14 (permalink) Old 07-14-2015, 05:39 AM
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Sounds like you got a "BONUS"! Crawler gears are amazing. Good for slow speed work but not pulling though. For offroad it is great in the rocks or technical sections. The "rumor" is they are weak but I have abused mine for 10 years and have blown up other stuff while in crawl and not the crawlers. Every failure I've had was while in crawl and I was bound up in an obstacle. My suggestion is while in crawl just idle... If the motor starts to bog down or stall your doing something wrong and try a different line because your getting ready to strip a ring gear, pop an axle shaft or explode a portal.... trust me

A "feature" of the crawler gears is while in crawl you can push the F-N-R lever from N to R while in crawl and back. You can even go from N to F and the crawl lever will pop out automatically.... SOMETIMES... I have on a few occasions been crawling up an obstacle, reached the top, started down, pressed the brake/clutch and pressed N to F and possibly rolled forward a little unknowingly and gotten the truck bound up in Crawl and F at the same time. 1-6, Crawl and F-N-R levers are all bound up and nothing will move requiring a buddy to release the tension on the gears by pulling me backwards. Sort of a pain so don't rely on the "auto" crawl disengage going N to F and/or be careful going from N to R back to N that you don't miss N and hit F while in crawl

--------------------------------------
Joe O'Bremski
1966/2014 404 Unimog/Tube Chassis buggy
1962 404.114 Pritsche
1959 404.114 Pritsche
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post #9 of 14 (permalink) Old 07-14-2015, 05:55 AM Thread Starter
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This place is a goldmine of information!

How would be the safest way be to disengage the crawler gears?
When not relying on the automatical disengaging.

Something like this ? :
Make sure the gear leaver is in Neutral, Put Main shift Leaver in idling position between 3&4th.
And then disengage the Crawler gear bu operating the Leaver.

I need a safe way to make sure nothing gets stuck.
Not alot of offroaders that would be capable of following my mog in the village.
So i expect i will be Soloing alot
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post #10 of 14 (permalink) Old 07-14-2015, 06:20 AM
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Safest way to disengage is to rotate that Crawler lever counter clockwise while in Neutral. 1-6 shifter can stay in 1st or 2nd while doing that. Once the crawler is disengaged your can flip to Forward. Always make sure you are at a complete stop, hard on the brakes so as not to roll to prevent the gear bind senario.

--------------------------------------
Joe O'Bremski
1966/2014 404 Unimog/Tube Chassis buggy
1962 404.114 Pritsche
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