The incident was reported at 9:31 a.m. at Volvo Construction Equipment and Services at 1944 Marina Blvd., fire spokeswoman Aisha Knowles said.
California Department of Occupational Safety and Health spokesman Peter Melton said the man, a field service technician, was working under a front-end wheel loader that had been lifted up onto support stands when the equipment slipped and fell onto him.
Fire crews arrived and found the victim crushed beneath the equipment. He was pronounced dead at the scene, Knowles said.
Firefighters assisted personnel from the Alameda County coroner's bureau in removing the body, Knowles said. Crews used a mechanical hoist to lift the equipment, she said.
According to Cal/OSHA records, the company has not previously been cited for any safety violations, Melton said.
No other injuries were reported in connection with the accident.
The coroner's bureau has not yet released the worker's name.
Bill Law, Vice President of Corporate Communications with Volvo Construction issued a statement on behalf of the company. He wrote, "We are aware of a tragic fatal accident at a facility owned by the company in California earlier today, our condolences and prayers are with the family at this time. At present we are trying to find out exactly what happened and are working with the relevant local authorities to do this. Work at facility was stopped immediately."
(ABC7 News contributed to this report)