U900 (Case MB4/94) Starter Issues for a New Mog Owner - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 04-04-2016, 09:10 AM Thread Starter
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U900 (Case MB4/94) Starter Issues for a New Mog Owner

Gentelmen-

Let me first say I find this site to be awesome and a valuable resource. I have been using it unregistered for a little while and decided to join today.

I recently purchased a Case MB4/94 U900 406 that was not running. The owner unfortunately passed away a year ago and he left quite the mess in regards to wiring. He was a farmer and there were quite a few "farmer fixes" under the hood. The mice also made themselves comfortable over the past year in his absence. It had been sitting outside without the hood.

I'm not one to shy away from a electrical challenge and dove into things. After running a few jumpers I was able to get power the critical components needed to attempt to start the Mog. With the clutch pressed I pushed the starter button...... The solenoid clicks and the starter motor fires up, but it is not cranking the engine. I let go of the button and the starter motor decelerates. I try a few more times and it's evident that the starter gear is missing it's teeth or it is not shooting out to engage the fly wheel.

I'd like to know what you guys think. My plan is to remove the starter after I figure out how to tilt the cab and bench test it. Is there a starter rebuild kit or should I go with this gear reduction starter off ebay:

New Gear Reduction Starter Fits Unimog U 800L U 900 AZJ3299 MT66BA 5001836 11360 | eBay

The price seems a little too good to be true, and I'd like to stick with OEM stuff. Has anyone rebuild an original starter or used one of the eBay gear reduction starters? The ad says they fit a OM353, but I imagine they fit the OM352 as well....

Let me also say that the battery is a new Optima blue top and it's also hooked up to a 100A charger/jump starter. My other though was that the fork that moves the gear out into start position is stuck? But if that was the case I don't think the starter motor would move, correct?

Thanks in advance for the help.

Anyway, here's some pics. I can take vide of the problem if needed and post it as well.



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post #2 of 31 (permalink) Old 04-04-2016, 09:32 AM
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I thought that your Unimog would be a 24V system. Do you only have one battery installed?
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post #3 of 31 (permalink) Old 04-04-2016, 09:41 AM
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Originally Posted by Diesel_Canuck View Post
I thought that your Unimog would be a 24V system. Do you only have one battery installed?
All CASE trucks were 12v originally.
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post #4 of 31 (permalink) Old 04-04-2016, 09:43 AM Thread Starter
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Originally Posted by Diesel_Canuck View Post
I thought that your Unimog would be a 24V system. Do you only have one battery installed?
Yes, only one battery. That's how I picked it up from the original owner's wife. I was under the assumption that Case MB4/94 was a 12V system. I guess I need to research more, or if anyone can enlighten me, it would probably be a good thing to know...
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post #5 of 31 (permalink) Old 04-04-2016, 09:50 AM
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Quote:
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All CASE trucks were 12v originally.

Von knows about CASE trucks. Yours should be 12V. I must have been thinking about the SEE versions.
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post #6 of 31 (permalink) Old 04-04-2016, 11:04 AM
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You can pull the starter without tipping the cab.

BWSwede
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post #7 of 31 (permalink) Old 04-04-2016, 11:58 AM
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There's an access panel for the starter motor next to the accelerator pedal. I'd removed it and try bumping the starter while tapping on it, might free up.
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post #8 of 31 (permalink) Old 04-04-2016, 12:15 PM Thread Starter
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Originally Posted by bwswede View Post
You can pull the starter without tipping the cab.

BWSwede
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Originally Posted by stevesmog View Post
There's an access panel for the starter motor next to the accelerator pedal. I'd removed it and try bumping the starter while tapping on it, might free up.
This is great info. Thank you. I think my floor board may have some repairs made to it, but I'll check. Perhaps what I thought was a repair is actually a access cover. I'll check when I get home from work today.

Also, in an attempt to to be a better Unimog owner I purchased this factory Case service and repair manual off ebay:

Original Case Unimog MB4 94 Service Repair Overhaul Manual Book 9 66021 | eBay

The price was a little steep, but will probably be money well spent in the long run.

Thanks again and any other suggestions are very welcome.
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post #9 of 31 (permalink) Old 04-06-2016, 07:42 AM Thread Starter
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Okay, I had a couple minutes to check out the removable service panel on the right side of the driver's floorboard. It looks like that is for both starter R&R and throttle work.

Has anyone ever taken one of these starters apart to clean the armeture, fork, etc? Are they similar to GM starters? They are the only ones I've ever rebuilt. Perhaps there is only one way to find out.....

The eBay people need the part number off my current starter to see if the gear reduction one will work. I may just buy one from VON since it seems like he knows his stuff.

Thanks again.
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post #10 of 31 (permalink) Old 04-06-2016, 08:50 AM
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Von's probably had more Case Mogs pass through his hands than anyone else on this board. He's got orange under his fingernails.

Von, didn't you have some high speed starters made at one point? They sounded like the old school pneumatic starters for big rigs if I remember correctly. Kinda cool.
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