Firstly many thanks for the replies so far. Secondly my regret for the weight error. The load being lifted was 1,600KG's being 3528 lbs. Thirdly the machine was a CAT TH360B.
I now have the Caterpillar machine details for this machine which are interesting.
From our onsite investigations we now know the forks/lifting attachment was at a height of 11.5 Meters and the jib was fully extended. Contrary to what we were told at the time of the incident we now doubt if the stabilizers were down. When the machine was righted they were more that 12 inches (300MM) of the ground.
The ground was not too bad for a construction site but still not level. Around the area of the machine the ground sloped slightly to the left.
I note the load charts on the CAT TH360B document (HEHB2806-2) gives a different load chart than that on the on-board flip charts --Why would this be.
They also state:- Load at Maximum height Stabilizers up 1,500Kgs
Given this am I correct in saying :- Machine overloaded when it tiped leftwards?

Regards Bill C