New Bright Cat 245D Hydraulic Excavator track rollers and rack

this is the 1998 old new bright before they had to remove the Cat logo because of copy right infringements

i will be working my way up this toy as i have kept it till i could replace parts now i have the means to replace broken parts and this toy has lots of broken gears and parts ?

could just buy a new one on ebay for parts but thien i would always have one that did not work ??