The performance of heavy steering is that when the driving car turns, it turns the steering wheel and feels heavy and laborious. The reason is that the upper and lower shafts of the worm are adjusted too tightly or the bearing is damaged; The engagement of worm gear and worm is too tight, and there is no gap between steering rocker shaft and bushing of steering gear; The steering shaft is bent or the pipe column is concave, scraping and touching each other; The steering wheel touches and grinds the pipe column; The thrust bearing on the steering knuckle is short of oil or damaged; The assembly of steering knuckle kingpin and bushing is too tight or lack of lubricating oil; The screw plug of steering knuckle tie rod (straight tie rod) is screwed too tightly, or the tie rod joint is short of oil; The adjustment of tie rod ball joint is too tight, or the pull head is short of oil; Insufficient tire pressure; The front axle or frame is bent and the front wheel alignment is inaccurate.