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1983 U1200 (parted out), 1979 U1700L
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Discussion Starter #1
As some of you know I picked up a U1700L and am in the process of getting it back together.

I want to have back up lights but am finding it very hard to find a switch for the tranny. My 1200 had a switch in the tranny, but it dose not fit the new tranny.

The switch hole in the 1200's tranny is 18mm and the one in the 1700 is 14mm.

Here is the data plate info off of the remand tranny in the 1700
TEIL NR437260230180
BM71881209
AGGNR000835

The data card for the 1700 shows it using the 18mm switch but the tranny has been changed since 1979 so that is no longer the case.

Dose any one know the part # of the 14mm reverse light?

Thanks
 

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U1550L/37 Doka, U1700L/38, Merc 1017A
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1,563 Posts
this might be a long shot but try to see if your spare pto/brake pressure/or 4x4/ senders are the same or not. doesnt hurt to just check.
 

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1990 Unimog 1300L, 2004 ML350, 1999 SLK 230,
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579 Posts
Based on the numbers you've supplied, attached are the part numbers you are looking for. The only problem is, the EPC doesn't show whether it's 14mm or 18mm
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #4
I have one of the wrong switches part # A001 545 1214

I wonder if the A001 545 8909 is the right 14 mm switch. I wonder how I find out (other than order on a d see)?
 

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1990 Unimog 1300L, 2004 ML350, 1999 SLK 230,
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579 Posts
I'm puzzled now. When I put the number of your present switch (A 001 545 12 14) into the EPC it tells me that it also has been replaced by A 001 545 89 09.

I agree with Tmax. You should maybe pull a couple of the other switches to see what numbers they have and what diameter they have. Some of these are identical switches.
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #6
I am almost sure the 4X4 switch is 18mm. I know the clutch peddle switch is 18mm (because I installed the clutch peddle switch in my U1200 tranny)

I thought the air switches (PTO, difflock, exhaust brake indicating switches) where not a push to operate switch, thought they are pressure switches, but I will check them again.
 

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Unimogs 435's
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758 Posts
I had to put reverse lights into all the NZ army U1700's Unimogs i imported. They were M18 thread. Plugged into the main wiring harness on the chassis and used the red and white (from memory) wires in the junction box at the rear tom power up the light. I have the part at home with the part number if needed. Ordered them through EI.
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #8
I had to put reverse lights into all the NZ army U1700's Unimogs i imported. They were M18 thread. Plugged into the main wiring harness on the chassis and used the red and white (from memory) wires in the junction box at the rear tom power up the light. I have the part at home with the part number if needed. Ordered them through EI.
I would bet the part # of the M18 switch is A001 545 1214, but the tranny in my 1700 has a M14 hole in a different location to the M18 hole in my U1200 tranny.

here is a photo of the U1700 tranny, you can see the plug in the hole just above the main shifter input (sorry for the crappy photo its the only one I have on me)

I also looked on line for a photo of the other location of the reverse light switch but I can't find one.

There are other differences between the 2 trannys, most notably there is an oil feed pipe that runs up and over the main input on the 1700 tranny. The U1200 has no external oil pipe on it.
 

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1990 Unimog 1300L, 2004 ML350, 1999 SLK 230,
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579 Posts
Well, I've gone through the EPC again and I'm coming up with the same thing. For the transmission number you gave, the correct back-up light switch is listed as A 001 545 89 09, which is position 10 on the attached pic.
I guess, all you can do is get the vendor to confirm the diameter before you take possession.
 

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I have one of the wrong switches part # A001 545 1214

I wonder if the A001 545 8909 is the right 14 mm switch. I wonder how I find out (other than order on and see)?

By doing a little detective work and asking friends to help. ;)

This one is pretty straight forward, based upon the parts diagram and numbers needmog posted above.

The seal ring that accompanies the switch is a DIN copper seal ring, with the part number of N007603 014406.

The 014 in the middle of the part number indicates that the washer is 14mm, so one can assume that the threads on the switch will be too.

One caveat.....the EPC does have errors from time to time.

The switch is on stock in Germany.

-Sean
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #12
Thanks every one for the help.

Steve (Eurotruck) got back to me yesterday with confirmation that the switch was 14mm so I placed the order.

Now all I have to do it put the tranny back together and re install it in the truck. (it was apart to add the working gears to it, not just for the reverse switch)
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #13
Switches.
Man we have missed you around here, and from the # of post you have made from the recovery bed, looks like you missed the place too.

Great to have you back and get better soon.
 

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'91 427.110 '02 405.230
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3,350 Posts
Hello everybody.
I just noticed my reverse lights are on continuously after I turn the ignition on.
I pulled out the switch itself from tranny housing and plugged into circuit.
When I press it on the knob of the switch, the light comes off.
So if the switch is pressure actuated, does it mean there is not enough pressure built up
when in forward position ?
 

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U1600Ag
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1,357 Posts
I gave-up on mine, I wired the reverse light to a labeled button on the dash instead. Labeled as "reverse light" makes it legal here.
 

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'91 427.110 '02 405.230
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3,350 Posts
More discoveries.
The switch is (or was to be exact :)) mechanical solenoid - not pneumatic as I expected.
By shifting front-reverse lever an arm or something inside transmission moves the solenoid between 27 and 34 mm range - measured with caliper.
27 for forward 34 for reverse.
Now I pulled the sensor out from housing and tested by hooking up to back up lights wiring.
The light was going off by pressing in the solenoid to 26mm, so just 1mm more than that the maximum movement inside transmission.
So I wanted to put it back in tranny with intention of eliminating that 1mm slack.
Well the sensor snapped in half and I'm in search for new one.
It is M14 size.
 

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1983 U1200 (parted out), 1979 U1700L
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891 Posts
Discussion Starter #18
To bad its the M14 one, because I have a new M18 one I don't need. Part # for the M14 is A 001 545 8909, I payed $69 for mine.
 

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'91 427.110 '02 405.230
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3,350 Posts
Hey Alex, I know .
I thought about that too.

Here is the confirmation about the switch:
"the reverse light switch is a mechanical proximity switch, which contacts onto a cam on the for/rev selector fork in the top of the gear box".
 
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