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Old Apr 20, 2001, 08:06 AM
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Marietta, GA
Joined Jun 1999
43,312 Posts
If you are going to run a motor designed or pre-timed for tractor operation as a pusher, using normal tractor props, then you do indeed need to reverse both the polarity, AND retime it for reverse rotation.
"Advance timing" means the brushes are positioned 'earlier' in the rotation. When you reverse polarity, the brushes are now 'later' in the rotation - you need to rotate them so that they're 'earlier' again, by the same amount. Measuring sometimes works (many motors come with prescribed or printed marks just for this purpose) or measuring current draw, as has been described here many times..
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