While sitting on the tractor, if the valves were manual, there would be a lever on the right side of the tunnel cover. You would lift this lever to release the valves so you could push it around. If there isn't a lever, and she pushes easy, it would have the auto release valves as Duke mentioned. Some of the manual valved tractors may have been switched to auto release valves by a PO, so it may still have a lever with auto valves. You could always pull off the tunnel cover and see what ya have. Nice 1650 BTW!
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Josh
Diesel Cub Cadets...........
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