Patent ID: 7434488

Claim:
A transmission for a tractor comprising: a transmission case having an opening that is formed in a side wall of the transmission case and that opens to exterior of the transmission case; a speed change device that is housed in the transmission case and that transmits driving power from an engine of the tractor to a driven wheel, the speed change device includes: a main speed change device capable of changing speed of driving power from the engine to a plurality of speeds; a main speed change shifter that causes the main speed change device to change speed; a sub speed change device that further changes speed of driving power whose speed was changed by the main speed change device; a sub speed change shifter that causes the sub speed change device to change speed; a cover removably attached to the transmission case for closing the opening of the transmission, the cover being capable of mounting a creep speed change device having a creep speed position; a main speed change shift fork supported by the cover and capable of engaging with and moving the main speed change shifter; a sub speed change shift fork supported by the cover and capable of engaging with and moving the sub speed change shifter.