Thule Omnistep Motor?

[StitchUp]

Over this weekend I spent sometime trying to get the Omnistep to work, although 12v is switched to the terminals on the motor - not a hint of action If I press the switch to retract the step 12v is supplied to one of the terminals and similarly pressing the switch to extend, so it doesn't seem to be a power issue. I'm assuming the motor/step metalwork provides the earth.

So I removed the motor, a BOSCH 0 130 821 603 Electric Motor

I connected a 12v supply to each of the terminals in turn with an earth connection to the metal body - again, nothing!

So, unless I'm being a complete idiot and doing something wrong I'm at the point of considering a replacement motor! Any suggestions?

BTW, no buzzer that I could see.

 

[Trevor Wbm]

Have a very good look at the metal frame of the step mechanism. Look for any points where wear and tear may have ocurred to the extent that the step is over-extending to a point where the motor can't move it. If that is the case, manual assistance might shift it, and if you can find someone to build up where the wear is with weld, that'll sort it hopefully.

Next step would be to look at the brushes in the motor and see if you can find replacements if they are worn down.

The motor seems to be the same as a left hand window winder for a 1997 Volvo 900 series ....

 

[Bobby-gg]

To test you apply the 12v across the contacts, and reverse the polarity to make it go the other - not to the motor body

When I stripped mine I found that the main axle on the gearbox was seized, so I clean and greased everything back up and it's been working fine ever since.

 

[StitchUp]

Thanks for the replies guys

Trevor Wbm​

Had a good look at the step mechanism and although old, it seems in reasonable condition, as soon as I removed the circlip and the square drive shaft from the step assembly the step just dropped down under its own weight

Trevor Wbm & Bobby-gg
My next plan is to disassemble the motor as I have nothing to lose. I can't turn the shaft at all, not even with a pair of pliers so this might be a possible problem.

Thanks for the suggestions, anything's better than spending money

 

[Winger]

It was posted here a few weeks back that this is the same motor but a lot cheaper than if bought from Thule. Take a peek!

Headlight Adjuster 0390203266 Bosch AHC Genuine Top Quality Guaranteed New 4047024419933 | eBay

Find many great new & used options and get the best deals for Headlight Adjuster 0390203266 Bosch AHC Genuine Top Quality Guaranteed New at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

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[Bobby-gg]

Thanks for the replies guys

Trevor Wbm​

Had a good look at the step mechanism and although old, it seems in reasonable condition, as soon as I removed the circlip and the square drive shaft from the step assembly the step just dropped down under its own weight

Trevor Wbm & Bobby-gg
My next plan is to disassemble the motor as I have nothing to lose. I can't turn the shaft at all, not even with a pair of pliers so this might be a possible problem.

Thanks for the suggestions, anything's better than spending money

You won't be able to turn the shaft as its a worm drive motor, the motor locks the output shaft.

Once you strip it down, you'll see how it works, but try voltage onto it again

 

[StitchUp]

Just stripped it down and can clearly see why I wouldn't be able to turn the shaft - the gearing is very very low and needs the high speed of the worm drive to turn the shaft.
I oiled it up and freed any stiffness but will have to buy some grease before I completely reassemble it. I did connect 12v but no sign of life! My feeling is the brushes are to badly worn:

Will try and remove them tomorrow and clean up etc

 

[StitchUp]

It was posted here a few weeks back that this is the same motor but a lot cheaper than if bought from Thule. Take a peek!

Headlight Adjuster 0390203266 Bosch AHC Genuine Top Quality Guaranteed New 4047024419933 | eBay

Find many great new & used options and get the best deals for Headlight Adjuster 0390203266 Bosch AHC Genuine Top Quality Guaranteed New at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

Will check this out, thanks Have to ensure the drive is square etc. It's a different part number I need 0 130 821 603 the Ebay advert shows 0 390 203 266

 

[donkey]

Just stripped it down and can clearly see why I wouldn't be able to turn the shaft - the gearing is very very low and needs the high speed of the worm drive to turn the shaft.
I oiled it up and freed any stiffness but will have to buy some grease before I completely reassemble it. I did connect 12v but no sign of life! My feeling is the brushes are to badly worn:

View attachment 669436

Yes, those brushes have had their day.

Geoff

 

[StitchUp]

Yes, those brushes have had their day.

Geoff

My guess is, they'll be difficult to purchase/replace

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