Pepe,
Have you tried giving the Technical Service of Komatsu New Zealand a call? Bet they have access to a Shop Manual.
Below is from the Komatsu New Zealand website.
Do you have a technical issue with your Komatsu equipment? Our 24/7 technical support hotline is a one-stop shop for all technical support enquiries for all Komatsu utility, construction and mining equipment sold in New Zealand.
Phone us at any time for technical assistance; our support includes everything from answering a quick shop manual question, right through to a lengthy technical troubleshooting solution session. It’s simply a matter of calling 0800 00 4127 and selecting Option 5 “Technical Assistance”.