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Thread: FLU419 transmission question

  1. #11
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    The farmer tool box method for allen wrenches you don't have such as the 14mm for the drain plugs, is to build one with a 1-1/2" long or longer bolt of the appropriate size. Double nut 2 nuts on the end of the bolt as hard as you can, keeping the sides lined up on the nuts. now you have a custom "allen wrench" special tool, that you can turn with a socket or wrench!

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    One of the things you should also check before tipping the cab and diving into that project is the shifter bushing. It is the bushing that the shifter rides in and they do deteriorate with time causing the shifter to sit to low in the collar and then the shifter doesn't engage the shifter forks properly. You can get to it by pulling up on the rubber boot housing from inside the cab and then from the side sticking your hands in through the passenger side it will have a metal collar the detents down and putting downward pressure and turning it I think counterclockwise and it will let you release the shifter (BTW you need to disconnect the 3 airlines for downshift lever if you want to pull it completely out). You should have two guide pins on the inside of the transmission collar and they have to be removed to get the bushing out. Hope it helps

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    coolhandmatt.......thanks for that info!! I just logged in to bump this thread to find your post with some excellent information. I will try that in the next couple days and see if it helps. It is a really strange scenario.....the gear shift just doesn't want to go in to 1st or 3rd. Luckily I have low range so I can still drive around my property and use the backhoe, but there is no way it would be driveable on any road/street. Have you seen that bushing cause problems with only the top 2 gears? Just asking, because there was at least one other person on here that stated they had the same problem as me. THANKS AGAIN and I'll post when I check it out.

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    subscribing to the thread opcorn:
    Lonnie KF5PVV

    11th ACR - early 70s

    1987 M923A1
    1990 M923A2
    1989 FLU419
    1988 M998
    1986 M105A2
    2008 M1101
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    1991 M101A2
    2010 MEP803A

    "5 second fuses only last 3 seconds"

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    Pictures of the bushing being discussed.

    http://www.expedition-imports.com/3102680035

    We do sell a lot of this bushing, however normally do not hear of reports of the issue only affecting selected gears.

    If in the SF Bay Area a good resource on these transmissions would be Mario Moreno in Dixon, CA. Considering he taught the military how to rebuild them for MB, I'd venture to say he has more knowledge than anyone else in North America. He's in retirement, but still regularly works on Unimogs from his home or service truck.

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    So I had a little time last night to mess around with it and I can't see how it would be the bushing (unfortunately). Maybe I'm thinking about it wrong though......I would assume that if the bushing is worn and allowing the gearshift to sit too low to properly engage the fork, I should have vertical "slop" in the gear shift. I should be able to pull up on the lowest part of the shaft and feel play, and if I try to shift into first while I am pulling up it should engage. Is that a correct thought? If so, my gearshift has no play and I'm not able to shift into first even if I'm pulling up on the gearshift. (SIGH)

    This gentleman you speak of in Dixon....would he mind if I called him and just picked his brain on my situation? I would love to have him fix mine, but the 817 mile trip there without 1st or 3rd might be a little tough. I'm honestly nervous about digging into this deal because for one, its a Unimog and stuff ain't cheap and two, I am completely intimidated by transmissions. Also, what should I expect when it comes to tipping the cab? I assume I'll need to remove the front loader mounts, but will I need any other special tools and what is the best method of doing the "tipping" without damaging anything (including myself)?

    If anyone knows of someone in my vicinity (eastern WA/north ID) that has experience with a 419 I'd love to talk with them. Shoot, I may even pay them to come over and show me what to do if that's an option. Thanks for the info so far. I'm really wanting to get the old girl fixed....it makes me sad seeing her sitting there every day without moving.

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    coolhandmatt......you were right on the money! I decided to pull the gearshift out and see what that bushing looked like and found a bunch of little bits (see picture).
    unimogbushing1.jpg
    I was amazed at how difficult it was to pull the gearshift out of the hole, but when it came free it popped right out. The end looks good with no real wear or strange bend. I got everything cleaned out that I could and stuffed a clean shop rag down in the hole to keep stuff from falling into the abyss. I was worried about the two pins, but they actually pushed out very easily. There are metal sleeves in the pin holes, and both of mine had "walked" inward, but a pair of vice grips gently pushed them back in place.
    I'll order the new bushing tomorrow. I'm surprised that on a Unimog they would design something like that bushing out of plastic rather than, say, oil impregnated bronze. I mean my truck just turned 3000 miles and the thing is toast. Yes, its 26 years old but if it were bronze it wouldn't need replaced because of time....just miles (and a LOT of them).
    I'll post again when I get the bushing in and update whether or not this fixed my shifting problem. My fingers are crossed!!

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    Adavis
    Glad you took it out. A lot of car companies had similar designs. I would recommend using some assembly grease when replacing the shifter. I had ordered the part from Couch Off road but Expedition Imports would probably be able to get it as well. BTW the part is 310 268 00 35. PS don't worry about the **** that falls into the tranny box. It is non metallic and won't mess anything up but placing a rag in the collar to keep dirt and debris out is a good idea and getting as much out as possible gets good marks.

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    SUCCESS!!!! Got the bushing installed with some good grease, slid the gearshift back in place and BINGO.....she shifts like BUTTA BABY!! 1st through 4th feel like silk. It's crazy that the bushing would disintegrate in 3000 miles but that's what happened. Thanks to everyone for the suggestions. Hopefully this will help other SEE's stay on the road.

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    Adavis,
    It probably wasn't the 3000 miles but the 30 years its been sitting in the tranny. Coincidently after doing the post I had to replace the bushing in the forward/reverse shifter. Luckily I had an extra one waiting for a rainy day. I don't know if it is common that both bushings would need to be replaced around the same time, but I wouldn't be surprised.

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