Reconstruction experts concluded the all-steer axles forced Engine 7 to go out of control on Edgell Road and hit a pole before coming to rest upright in the front yard of a home.
The 18-page report released by Massachusetts State Police goes on to say there is no evidence that Firefighter Dave Carol was speeding or at fault in the crash.
The report does state that the four firefighters aboard the 2001 Pierce Quantum pumper were not wearing seat belts -- which is required by department policy -- and that they could have prevented the injuries by wearing them.
Capt. Bill Norton and firefighters Bill Clover and Bob Delaney remained on paid medical leave as of late July and Carol has since retired.
The report also shows that mismatched brakes were installed on the engine, but that they did not play a role in the crash.
Town Counsel Chris Petrini told the newspaper that he will review the findings with selectmen, who will decide whether to bring a lawsuit against Pierce.
Pierce sent two engineers to check for any issues with Engine 7, but the state police report claims their engineers' analysis had several flaws. Pierce's report has not been released and the newspaper did not get a statement from the company.
Following the crash, the department disabled the all-wheel steering feature on Engine 1, and also said it would disable that function on Ladder 3 and use it only when needed.
In June, Framingham's insurance carrier declared Engine 7 a total loss and made a $225,000 payout. The department has since been using a 17-year-old backup engine as it looks for a permanent replacement.