When the tractor is in motion, especially on rough or uneven roads, you may notice that the trailer wheels suddenly lock up even without pressing the brake pedal. The tires can drag for a long distance, or after pressing and releasing the brake pedal, the wheels fail to turn again. This phenomenon is commonly referred to as "wheel lock-up" or "wheel stalling."
The primary causes of wheel lock-up include:
1. Severe wear between the brake pin axle of the trailer and the brake shoe pin hole leads to excessive clearance. This instability causes the brake shoes to partially contact the brake drum when the vehicle hits bumps, creating friction resistance that locks the wheel.
2. If the return spring of the brake shoe has insufficient elasticity, the friction plate may remain in the braking position even after the brake pedal is released. This keeps the tire in a braking state, causing the wheel to lock.
3. Improper installation or adjustment of the friction plate can result in too little or no gap between the plate and the brake drum. This leads to a semi-braking condition, which also causes the wheel to lock up.
To resolve wheel lock-up issues:
1. If the wheel locks during operation, stop the vehicle and press the brake pedal several times. You can also tap the brake drum to loosen it, then gently move the vehicle forward. This might help the wheels rotate again.
2. If the issue is due to weak return springs, replace them along with any worn bearings.
3. If the brake pin shaft and its hole are excessively worn, consider replacing the damaged parts. You can also ream the worn hole and install a bushing to restore proper fit.
Additionally, ensure that the gap between the friction plate and the brake drum is properly adjusted. Finally, tighten the nut outside the bearing so that the bearing has no play but still rotates smoothly. Regular maintenance and inspection of these components can prevent future lock-up problems.
Cohesive Elastic Bandage,Cohesive Flexible Bandage,Cohesive Elastic,Medical Bandage
Suzhou Letai Medical Technology Co.,Ltd. , https://www.letaihealthcare.com