He never pretended the tractor was perfect.
Quite the opposite.
He spoke about its faults with the affectionate irritation of a man describing an old friend.
"That left brake needs a little attention."
"Cold mornings make her stubborn."
"Don't force the gear lever."
"Listen to the engine before you decide something's wrong."
His grandson heard those phrases from the time he could walk.
The boy's earliest memory of the tractor was not driving it.
He was too small.
Instead, he remembered sitting on an overturned bucket inside the barn while his grandfather worked beneath the hood.
The old man wore faded denim overalls, a red flannel shirt, and a battered cap with a green-and-yellow tractor emblem.
His hands were large.
His fingernails permanently stained by oil.
His face lined by years of sun and wind.
And his voice carried a patient warmth that made the boy feel capable even when he understood almost nothing.
One afternoon, when the child was six, the grandfather removed a worn spark plug and held it out.
"See this?"
The boy nodded.
"What is it?"
"A little piece of the reason an engine runs."
The child stared.
"It makes it go?"
"Helps."
The grandfather smiled.
"An engine needs several things working together."
The boy frowned.
"Like what?"
"Fuel. Air. Compression. A spark at the right time."
The old man counted them on his fingers.
"Take away one, and a perfectly good engine can act like it's dead."
The boy looked toward the tractor.
"Dead?"
The grandfather laughed.
"Not really dead."
He placed the spark plug on the workbench.
"Just waiting for somebody to figure out what's missing."
The child considered that.
Then asked whether he could fix engines someday.
His grandfather smiled.
"Of course."
The boy looked excited.
"Even tractors?"
"Especially tractors."
Then the old man added something the boy would remember long after his grandfather was gone.
"Just don't guess when you can test."
The boy repeated the words.
His grandfather nodded.
"Good."
Then handed him a clean rag.
"Now help me put these tools away before your grandma thinks we've moved into the barn."
The boy laughed.
And they worked together until sunset.
The boy's father died when he was seven.
It happened during a winter storm on a state highway nearly forty miles from the farm.