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1981 Case 406
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Discussion Starter · #1 ·
I was wondering if anyone would have the measurements of all the coil springs (when they are new) on a Case mog just to compare with my old ones to see if they are sagging and need to be replaced.

There are inner and outer coils. I'm gonna go out on a limb here and say that they are not all identical.

All and any help is appreciated.

Cheers, Rolf in Montreal.
 

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1973 416 Doka, 1978 416 Doka, 1980 416 Doka..... Help me, I can't stop buying them!!!
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Rolf,
According to the work shop manual, they should measure 350mm +/- 5mm for the rear and it depends on which springs you have in the front. This measurement is done when they are out of the truck. If not within specs it is time to replace them. Seems that the fronts don't last due to the weight of plows and blowers, but since you have a CASE unit. They could be shot on both front and rear, if there was a backhoe or trencher on it. Only way to tell is by measuring them. Would need to know what size wire is on the fronts to know which springs you have. Also I have never seen helper springs in the front before!
 

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1978 406.120 1977 416
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SEE springs?

Rolf,
Also I have never seen helper springs in the front before!
Hi Rolf,
X2! I have thought about it as my Schmidt dozer blade seems to have more down travel than up.
It doesn't seem that I would need that much down, and the limited up makes the approach angle very small.
If you do decide to get new springs for the front, I see that Scott @ EI has new "reinforced" SEE springs for a great price.
I was wondering has anyone used these SEE springs on a 4*6 ? Are they too much spring? I would like to raise the height of the blade a bit, but sure don't want to make the 406 too much more stiff unladened.
Do you know if your front helper springs are stock, or did someone put the rear helpers in the front? I know my 406 has carried a snow plow, as well as the Schaeff HT-11A backhoe, so it is likely that my springs could be a bit tired too.
The SEEs are a good price if they will work properly. Anyone have any experience with these?
Thanks
Tim
 

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406/416 coil spring data from the forever missed Mr. Jack Russell:



> Question to the list coil spring experts---On my 416 there are front coils
> with only 4coils as compared to the 5 coil larger springs on the U900
> MB4/94. The problem is that the 416 front end sags severely with the MB
> winch up front.

As with all things from Ma Benz it aint that simple. There are three
different springs possible on your 416 as standard, without assuming someone
installed incorrect springs. (There are a veritable plethora of different
springs available.) We have even had a brand new unit delivered with
incorrect springs when they installed the wrong ones on the production line!

The "Standard" spring for the 416 has specifications as follows:

5.75 coils of 23.3 mm diameter wire. The springs have an unloaded height of
255 mm ± 5 mm (this would be measured with the spring removed and resting on
a level surface). The loaded height is 118 mm The coils have a nominal
diameter of 175 mm. This spring has a test load of 20,000 ± 900 Newtons. The
spring rate is 146 N/mm

The optional "heavier" spring has 6.5 coils of 24.5 mm diameter wire. These
have an unloaded height of 300 ± 5 mm, and a loaded height is 126 mm. The
coils are the same nominal 175 mm diameter. The test load for this spring is
25,750 newtons and the spring rate is a little higher at 148N/mm. This is
the spring you will most often find on the CASE MB4/94 as they were normally
sold for operation with a mounted front implement. (CASE also used the
lighter springs, so just because they are "CASE" springs, doesn't
automatically mean they are the heavier rating.)
The heavy duty springs were usually used with optional shocks, and optional
rubber buffers (stops) on the axles.

Installed on the truck it can be hard to count coils, etc, so the "quickie"
method is just measure the wire diameter with a pair of calipers.

They also offered a special "Softer" spring (maybe so those Hauptmann's could
ride in comfort)? It has 6 coils of 21.0 mm diameter wire. These have an
unloaded height of 255 ± 5 mm, and a loaded height of 118 mm. The coils are a
nominal 180 mm diameter. The testing load is only 13,000 + 1800 Newtons, and
the rate is only 80.7 N/mm. When this spring is installed the permissible
total weight is greatly reduced.

If you had an installed front winch with these the nose would definitely be
buried. One way you can identify what you have is to remove the spring.
Because of TUV regulations the actual part number is stamped into the spring.
>From the part number, a dealer can give you all the technical information and
performance ratings for the spring.

The above applies to 416's in general, for 416.160 they used yet another
spring as standard.

Jack Russell
 

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Sold .....1987 U1250 Unimog
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Honestley

From a non scientific view, the springs look out of shape and out of alignment from the photos, The one looks like the top and bottom are off be at least a few inches. But maybe its just a photo thing.
 

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BenzWorld UNIMOG statesman
Unimog 404.1 Diesel (sold :( )1995 LMTV 1078, 1995 M1079, 1079box for sale !!!
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Honestley

From a non scientific view, the springs look out of shape and out of alignment from the photos, The one looks like the top and bottom are off be at least a few inches. But maybe its just a photo thing.
While you could be right... it's hard to tell with out a portal and tire mounted. Also the way the axle is hanging by a chain from the chassis may be tweeking the rear suspenion odly causing the displacement from top to bottom your sighting.
 

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1978 406.120 1977 416
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528 Posts
Thanks Rolf for the update.
Well just for the record it looks like the SEE springs are for a dedicated implement carrier.
Take care
Tim
 
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