Was on a visit to Equipmentstore's test field for machines where they test drove a Sany SY 155U to check the stability with different buckets. Here the machine is run with a 0.85m3 bucket - no problem.
SY 155U data:
Engine: Isuzu 4JJ1X 78,5 Kw 107 HP
Bucket: test 0,85 m3
Operating mass 16,0 ton