The Question and Answer section for The Grapes of Wrath is a great resource to ask questions, find answers, and discuss the novel.
I'm sorry, I do not understand your question as asked. Please correct and repost.
The tenant farmers are being replaced by machines..... new tractors, the "machine man". Because of this, many of the tenant farmers are no longer needed.
"..... the machine man, driving a dead tractor on the land he does not know and love,...
From the text:
Muley said over the fire, "You fellas'd think I'm touched, the way I live."
"Touched nothin'," said Joad. "If you're touched, I wisht ever'body was touched."
Muley continued, "Well, sir, it's a funny thing. Somepin went an' happened...