First thing is find a Komatsu dealer,which in Columbus is Columbus Equipment, they will be your parts hook up, or Equipment Salvage in Cambridge Oh. These fellas have alot of new, used, and aftermarket parts for Galion. Buy some spring clamp hose pliers off a tool truck, you'll need them to take off the boot clamps off the hyd. valve body.
Which engine is in the ole girl? IH, Detroit, or Cummins?
I see you're a Buckeye, OH.......