404 Unimog Power Steering - Mercedes-Benz Forum
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#1 (permalink) Old 06-17-2013, 10:35 AM
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404 Unimog Power Steering

I've put electric power steering on my Unimog 404 for under $300 using parts from junk yards and electronics off a popular auction site. It works great. I can drive my rig with one finger on 43" tires with both axles locked.
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#2 (permalink) Old 06-17-2013, 10:41 AM
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Sounds great! Can you provide details on your design? Parts?
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#3 (permalink) Old 06-17-2013, 12:56 PM
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For the controls I used

Saturn Vue ion Chevrolet Equinox ? Electric Power Steering Controller Box ? Epas | eBay

For the motor assembly I used

02 07 Saturn Vue Electronic Power Steering Pump Motor Assembly | eBay

I hard wired the system to one battery and fabed some brackets to the steering column. I used a splined knuckle from the donor vehicle that I welded to the original shaft so that the unit is removable. I had to cut the dash just a little for clearance, but I can still hook up my heater duct. I did replace my steering stabilizer cause at high speed it was scary but that was only $60 (I found a post where a member used a Monroe shock and kit, it was almost a direct bolt-on). The unit has a adjustment knob to control the assist from none to one finger.

On pavement at a dead stop it still requires some muscle to fully turn the wheels but I have larger tires and if your moving at all its a unbelievable difference.

I'm not going to lie and say this was a easy plug and play system. It took a lot of planning and measuring mixed with some welding and bending but it can be done.
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#4 (permalink) Old 06-17-2013, 06:47 PM
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Nice job
If ECU or electric motor fails i assume it just goes back to being manual steer?
If you wired directly to one battery to get 12v it will kill both your batteries due to uneven draw/charge would be best to use a small 24to 12v converter
Cheers and thx for sharing parts info!

-------
Tech
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#5 (permalink) Old 06-17-2013, 09:13 PM
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Sweet job. Where in the hell were you hiding when I lived in Cookeville. Just moved from there to southern OH back in Oct.

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#6 (permalink) Old 06-18-2013, 07:35 AM
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That's correct, if the ecu stops working you go back to manual steering. I'll keep an eye on the battery. I've got a 24/12V for the radio but I didn't want to pay for a higher amperage converter. I ran 10G wire with a 30AMp fuse.

Coachgeo I live in the city limits and drive it about once a week. If you ever come back holla at me and we'll twist one off.
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#7 (permalink) Old 06-18-2013, 11:59 AM
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Oh..."Twist one [off]" Not twist one [up]. I was thinking 'man that's bold', and 'he must know something about George that most here don't'.

Cool project.

- Sent by pigeon or by accident -
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#8 (permalink) Old 06-18-2013, 04:36 PM
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Where is Trev with the technicolor yawn.
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#9 (permalink) Old 06-18-2013, 05:26 PM
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#10 (permalink) Old 06-18-2013, 06:39 PM
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Check out the Pyle PWM 24-12v converters. I'm not a Pyle fan, but they were sooooo cheap and have worked great for me in the 30amp plus range.

FOR SALE: 1985 U1300L 200HP $50,000
FOR SALE: 1969 404.1 crawler mog $25,000

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