Re: JD's 1941 180 Limousine
Posted by JD in KC On 2011/8/13 8:18:02
Gerd,
The Auto-lite pump motor does reverse to lower the windows. There are two solenoids, one for up and one for down. It was the later post-war pumps that were single direction. I think possibly the different design of the pump gears allowed the back-flow of fluid with the post-war models. You are correct that the design of the pre-war pump which is geared like an oil pump will not allow a back-flow of fluid unless the pump is running in reverse.
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The Auto-lite pump motor does reverse to lower the windows. There are two solenoids, one for up and one for down. It was the later post-war pumps that were single direction. I think possibly the different design of the pump gears allowed the back-flow of fluid with the post-war models. You are correct that the design of the pre-war pump which is geared like an oil pump will not allow a back-flow of fluid unless the pump is running in reverse.
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