"Report on completion of experimental works on armoured vehicles from May 20th, 1941, to June 20th, 1941
Object 220 (KV-3 base)
As of June 20th, the tank traveled 1979 km in total, 584 km after reassembly. The 850 hp V-2SN engine #2(1193-03) installed on May 30th worked for 27 h. 21 m. During trials, the following defects were discovered:
- 3 sets of exhaust collectors burned up over the course of 284 km.
- 4 final drive ferodo ribbons burned up. Cause: improper installation and adjustment.
As of June 12th, the existing defects are: