I have a 621 cat scraper with a slipping transmission. It pulls fine in all gears until in is used for an hour or two, then the transmission gets hot and if it is shifted will only engage in first and reverse gears. After it is shut off and cools (overnight) it pulls fine until it again gets hot. I have changed the transmission fluid and filter, oil and filter looked good. I think the transmission is over heating, does anyone know how the transmission is cooled and what I need to do to fix it?
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