1993 Land Cruiser passenger seat won't go back and forward

[Irish Wake1011]

Hi passenger seat on my Land Cruiser will recline and raise up and down but will not go forward or backward I cannot hear any motor running took it apart cleaned and greased it made no difference I know I need to replace the part that has the little plastic gear in it but what else could it possibly be beside a switch or the motor or the part that has the that sits between the two adjustment rods. Thank you in advance