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Window regulatot

Author Topic: Window regulatot  (Read 139 times)

marku

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Window regulatot
« on: 29 July 2020, 10:41 AM »
How would you test the motor for proper function? Took it off the car because regulator wasn't working and found motor gearbox solid with dry grease. All clean but can't see how motor works as there are only 2 wires up and down. Is it DC as understand you can change polarity to reverse not AC?
450SE silver green/bamboo velour/green vinyl roof
Mercedes Viano Ambiente 2.2CDI L

ptashek

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Re: Window regulatot
« Reply #1 on: 29 July 2020, 02:24 PM »
How would you test the motor for proper function? Took it off the car because regulator wasn't working and found motor gearbox solid with dry grease. All clean but can't see how motor works as there are only 2 wires up and down. Is it DC as understand you can change polarity to reverse not AC?

Yes. The polarity is reversed at the switch.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

marku

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Re: Window regulatot
« Reply #2 on: 30 July 2020, 05:38 AM »
Yes but does not answer how I test the motor alone? There is only the 2 wires which are up and down. I assume that with polarity reversal that the 2 wires would change positive/negative but there is no ground for the motor alone.
450SE silver green/bamboo velour/green vinyl roof
Mercedes Viano Ambiente 2.2CDI L

ptashek

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Re: Window regulatot
« Reply #3 on: 30 July 2020, 09:45 AM »
Yes but does not answer how I test the motor alone? There is only the 2 wires which are up and down. I assume that with polarity reversal that the 2 wires would change positive/negative but there is no ground for the motor alone.

It's a DC motor, if you give it +12V on one lead and ground on the other, it'll spin in one direction. Reverse, and it'll spin in the other.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

marku

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  • Posts: 855
  • Location: Leicestershire, England
Re: Window regulatot
« Reply #4 on: 31 July 2020, 05:11 AM »
That's what I thought but it doesn't. It just hums and from that I presume it is no more. It is an ex-motor. Rotor turns freely so it is not that. Will re-assemble until I get round to replacing. Thanks for advice.
450SE silver green/bamboo velour/green vinyl roof
Mercedes Viano Ambiente 2.2CDI L

ptashek

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Re: Window regulatot
« Reply #5 on: 31 July 2020, 03:14 PM »
That's what I thought but it doesn't. It just hums and from that I presume it is no more. It is an ex-motor. Rotor turns freely so it is not that. Will re-assemble until I get round to replacing. Thanks for advice.

Could be as simple as worn out brushes. Those motors are perfectly rebuildable, unless the windings are shot.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

marku

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Re: Window regulatot
« Reply #6 on: Yesterday at 08:11 AM »
Maybe but how do you get the pvc cover off complete.
450SE silver green/bamboo velour/green vinyl roof
Mercedes Viano Ambiente 2.2CDI L

ptashek

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Re: Window regulatot
« Reply #7 on: Yesterday at 01:08 PM »
Maybe but how do you get the pvc cover off complete.

They are epoxy potted from the top if memory serves. It needs some careful prying around, but should come off.
I've looked at my resto pics as I remember having a couple of the motors in a disassembled state, but can't find them anymore.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)