Looking for any info on a Valmet 644 with Cummins 4BT
​
I’m trying to track down some information on a Valmet 644 forwarder we’ve got. We think it’s a 1997–2000 model, and it’s running a Cummins 4BT engine. The main problem we’re dealing with right now is the hydraulics heating up really fast under load. The radiator is in fact shot, but my dad thinks its more than that.
We’re basically looking for anything that could help us identify or work on this machine:
- Service/workshop manuals
- Wiring diagrams / schematics
- Hydraulic schematics
- Parts books
- Electrical diagrams
- Serial number / model info
- Anyone who’s worked on these machines before
- Contacts for old Valmet techs, dealers, engineers, or anyone who really knows these inside and out
- Any archived Valmet documentation
- Even info on other 644s that might help us figure ours out
If anyone has manuals, diagrams, old dealer info, contacts, photos of their machine, or even just a lead on where to look, I’d really appreciate it.
There is a pic attached of what I (I could definitely be 100% wrong) believe to be a serial plate? Truthfully ive only been running her consistently for about 6 months now, though my dad has had it for 6ish years. He has put two engines in it.
Basically I'm just trying to piece together info on an older machine that doesn’t have a ton of info floating around online. Any sort of info if greatly appreciated.