any information on a komatsu winch coupled to a komatsu d31a fom the 1970s
You're going to have to provide more information than that. The Komatsu dozers usually have a Dash number after the model. Something like a - 16 or - 22. A serial number would help. Will also need at least the make and model number of the winch. Some winches were PTO driven while other are all hydraulic. Photos always help. Someone here might recognize it from that.
a komatsu dwt031-a winch for a d31-16 dozer is a pto shaft driven off the back of the transmission totally independant hydraulic operated------/dozer serial# is 2036------winch is attachment serial# 2001 and up