Two JCB Group subsidiaries have been fined a total of £466,000 for the deaths of two employees on site.
JC Bamford Excavators has been fined £266,000 following the death of a worker on the company’s Staffordshire premises in September 2006.
Paul McNamara, 43, suffered fatal head injuries after being crushed by the boom of a backhoe loader.
In addition to the fine, the company - which pled guilty - was also ordered to pay £31,701 in costs.
Another JCB Group-owned company, JCB Earthmovers, also received a fine for the death of one of its employee in November 2005.
Darren Ellis, 33, died testing the fuel tank of an earthmoving machine for leaks. Investigations revealed that Mr Ellis was standing close to the tank when the inspection plate blew off, causing him fatal head injuries after he connected a high-pressure airline instead of using low pressure.
The company was fined £200,000 and ordered to pay £31,366 in costs for breaching the Health and Safety Act.
The decisions were handed down in the Stafford Crown Court.