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Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 26029
Experience:  Technician turned service manager on multiple lines of trucks and engines, used in industry.
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Representing a driver of a 2005 Freightliner pulling a trailer

Customer Question

Representing a driver of a 2005 Freightliner pulling a trailer with heavy equipment. Freightliner traveling b/w 50 and 60 mph when hit by another 18 wheeler traveling approx. 15-20 miles faster. 2005 FL and trailer towed and when driver tries to drive tractor back to point of origin, tractor sputters and will not go half a mile. Tractor towed back and determined to have cracked and broken rocker arm assembly. I am told by shade tree mech. that if that 2005 FL going 50-60 is hit by another truck and trailer going 20-30 miles faster, there could be shock to wheels, drive train and then to the engine which would cause the engine to overspin (wheels forcing engine to go faster than wanted to go) which could crack or break rocker arm assembly. Do you agree?
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Curtis B. replied 1 year ago.
Absolutely! Same as going over a hill and the engine speed increases and over speeds the engine. The strike from the rear would force the wheel speed to increase and cause overspeed to the engine. Engine governor can not control it!