TWO small bits of a trailer bearing caused two fires that burnt 60 hectares of grass and bushland in Lyal yesterday.
Incident controller for the Redesdale-Lyell Road fire Mark Gilmore said it was a mechanical malfunction that started the fires.
"It doesn't appear suspicious," he said.
"Two pieces of hot metal were found in two locations and appear to have started the fires.
"Despite the fires starting quite close together, they did give us some problems."
Mr Gilmore said the fires started near the Lyell Road bridge just after 4pm yesterday.
It took CFA crews, with the assistance of air support, just under two hours to contain the fires.
"Initially there were two houses in the (fires') line but some good action on the ground along with support from the air saw those houses saved early," Mr Gilmore said.
The fire affected both public and private property with only some grassland and fences damaged.
"There were no buildings lost or civilian injuries," he said.
"One of our firefighters did receive a knock to the head, which resulted in a small cut but paramedics treated him at the scene.
"He didn't require a visit to the hospital and he is in the care of his wife."
Mr Gilmore praised the efforts of all the fire crews involved but warned people not to become complacent on cooler days.
"The day was listed as a moderate (fire danger) rating but this fire still got out of control," he said.
"If the grass is dry and it's windy fires can still move and become a danger.
"People should remain aware as to what's going on.
"If you see smoke overhead that is coming toward you it means the fire is moving your way."
Crews were still working on the fire last night and a skeleton crew was keeping watch overnight.
Mr Gilmore said fire crews would patrol the area for the next couple of days.
For more information visit www.cfa.vic.gov.au