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Author Topic: Unimog faults and common problems  (Read 13541 times)

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Unimog faults and common problems
« on: July 28, 2013, 10:08:41 am »
I've been thinking that this topic could be of use to many, including myself. We have a couple of very competent Unimog owners on here and it would be good to share this sort of info for folk like myself who are looking to buy their first truck. Do they have common faults? Things to look out for that are more expensive to fix than you may expect? I know someone once told me about the portals being very important as they hold very little oil and can leak? Is that right? Anything else to look out for?

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Re: Unimog faults and common problems
« Reply #1 on: July 28, 2013, 01:41:45 pm »
The u900 ...Yeah hubs don't have much oil so if the seal has gone then replace or keep topping up, cascade gear boxes DON'T crunch and the splitter box needs to work on cascade boxes. I've heard electrics can be trouble some at times (brian?)
cant beat the smell of diesel and 2stroke in the morning :)

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Re: Unimog faults and common problems
« Reply #2 on: August 05, 2013, 07:14:33 pm »
Dad says pay 400 quid and somebody will go and have a look at it for you... (wink wink  ;) )
 :D :P
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Re: Unimog faults and common problems
« Reply #3 on: August 05, 2013, 10:48:09 pm »
When I finally buy one I will take that advice. £400, compared to what it could cost if something obvious was to go wrong, is a bargain! Will he be driving down in the black mog so I can have a play for comparison? :P

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Re: Unimog faults and common problems
« Reply #4 on: August 06, 2013, 10:41:44 pm »
I'd recommend buying one which has everything on you wish to have as sourcing parts like 3 point linkages is not cheap.  If you see one on ebay, get in touch with them and go and see it as most people will do a deal off ebay to save their fees.

My 406 was a right sight but ran, moved and that was it, the rest was a gamble but the person I bought it off had loads of spares in boxes for it so I assumed it had come from a good home.

Worst thing with mine was the muppet who took the cab apart cut through every single wire rather than unplugging / undoing the harness, even the wires in the harness right next to the plugs which go into the clocks so close that you couldn't join them easily, all because 'he was going to make his own harness'.... fortunately I found a genuine 416 harness for a bargain price and bought a genuine ignition switch so plugged everything back in again.

Strange thing is that everything I seem to buy is near Brighton and I live near Alton Towers so it's always a trip to see them but it's worth it.

Do you know what you want?

Ed

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Re: Unimog faults and common problems
« Reply #5 on: August 09, 2013, 06:54:48 am »
I think my perfect mog at the moment would be a U900 with front and rear linkage and pto's - preferably 2 speed for running low power need kit at tickover. Front linkage I could do without but it needs to be a 3 way tipper. I'd need a hydraulic feed to both ends to run a log splitter.

I've got a picture in my head of a large mowing deck on the front end that could raise up against the truck so it doesn't stick out too far.  I don't know why but a deck on the front seems like it would be easier and quicker to use than a rear mounted one? Turning around trees etc would be much easier that way I think? We have a lot of horse types around here with small paddocks, it could be a good earner if I could mow the thistles for them.

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Re: Unimog faults and common problems
« Reply #6 on: August 09, 2013, 07:29:58 am »
U900's are good, I have one. 

As for your wish list I'd be happy to buy one with everything except the front linkage as you could always make a tractor front linkage to fit, which would give you tight folding arms when you don't have anything on the front, they also have quick release balls on them so it's easy to put implements on, I converted my rear linkage to have quick release and their a godsen.

I have seen reverse drive front Pto boxes on ebay now and again so their not rare if you need one for your mower.

As well as ebay look in the farming papers, some dealers sell them without knowing their true price, a combine dealer near me had a 416 with a jetter on the back in his yard for ages at 3K but just advertised in the farmers weekly.

Mowing is good, but check out if it's ok using red diesel if you get asked to mow public land, seem to remember you should be on white as it's a tractor.

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Re: Unimog faults and common problems
« Reply #7 on: August 09, 2013, 10:38:37 pm »
go with a schmidt plate everytime, weight's held further into the mog, and you can get or make a linkage adapter kit.
I am wanting to do a list, there's just a lot to put and im really busy at the mo!  :)
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Re: Unimog faults and common problems
« Reply #8 on: August 12, 2013, 09:24:07 pm »
Schmidt is a good way to go and that would make the arms easy to take off when you don't need them, or even better get a mower with Schmidt mount, you can then put anything on it not just a front linkage but flail mowers, plows etc.

Ed


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Re: Unimog faults and common problems
« Reply #9 on: August 12, 2013, 09:36:25 pm »
have you thought about the 6 wheeler on ebay at the moment?

I saw the pictures of the damaged hub and it seems nothing to big, and it's a good price for something to fix up.  The guy has loads of photos he can send to you and it's been for sale for about a year as I asked last year all about it but I couldn't justify another as the trailer was more of a priority.

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Re: Unimog faults and common problems
« Reply #10 on: August 12, 2013, 10:33:03 pm »
That six wheeler isn't for me - too complicated and not really what I'm after. It's an interesting looking truck mind.

How do you get kit on and off of a Schmidt plate? Lots of grunting and straining or a crane? ???

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Re: Unimog faults and common problems
« Reply #11 on: August 12, 2013, 11:07:18 pm »
Finding a mower with Schmidt mountings is hard work, unless you go for something like a ducker or Mulag fme mower, then you're looking at lots of pennies :) you could mod a mower to fit Schmidt mountings, the only difficult thing would be pto angles as the pto joints with a Schmidt mounting are very close together, hydraulic would be the answer.

As for mounting, wind up or hydraulic legs :) very easy once you do it once or twice :)

6x6 thing is cool, not sure if its an original factory job looking at it tbh. If not its an unbelievably tidy job. Shame if they drilled and extended the chassis though :/
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Re: Unimog faults and common problems
« Reply #12 on: August 13, 2013, 06:12:05 pm »
Do something useful bri and get some pics up.    :P ::) I wanna know how the schmit plate works with linkage type implements. I cant search very well on this stupid phone
cant beat the smell of diesel and 2stroke in the morning :)

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Re: Unimog faults and common problems
« Reply #13 on: August 30, 2013, 06:47:38 pm »
gonna have to do a quick list for now, feeling dead guilty not replying.
the fact of the matter is that every mog is different and there are a wide veriety of things to look for, so im gonna add to this list as i go along, and then eventually make a designated thread.

so a couple of things to look for:

these are generally u900 things, but some of it can be passed onto other mogs :)

hub oils, undo the bung and check level, check colour also, dark/burnt oil NOT GOOD. if there is to much oil in the hub (above check level bung), top hub seal has gone, letting oil in the hub from the diff. if there is over much oil in the diff (above check level bung) gear box seal has gone letting oil go down the torque tube.
when you take it for a test drive check all the hubs when you stop, put the back of your hand against it, if hot after a few miles, somethings wrong. do this with the diffs as well.
on cascade gear boxs bounce up and down on the accelerator, if the cascade leaver looks like its gonna bounce out, or even DOES bounce out  :o stay back, major money to repair!  >:( :-*
check engine hours (front right of engine as youre sat in the cab) miles arent so important in a mog, its all about engine hours  :) above 7/8000 hours usually looking at a replacement engine/ rebuild, but we've seen them at 12000 before and theyre still going strong :)

regarding electrics, its normally just corrosion, stuff youd expect to see on an old truck. :P

i'll add more as i come across them :)

Brian  ;D
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Re: Unimog faults and common problems
« Reply #14 on: September 02, 2013, 09:38:37 pm »
Cheers Brian. I've not dropped by the forum for a while but spotted this and it's an interesting read. A dedicated topic when it builds enough would be great.