A road wrecker, also known as a recovery vehicle, tow truck, or road rescue vehicle, is designed with multiple functions such as hoisting, pulling, and lifting for towing operations. Its main uses include clearing accidents, handling breakdowns, removing illegally parked vehicles, and aiding in rescue efforts. Like any vehicle, wreckers can experience mechanical issues. Below are some common problems and their solutions:
Problem 1: Wrecker’s Boom Vibrates During Extension
Cause & Solution:
- This issue may be due to a problem with the boom’s sliding block. If there’s insufficient lubrication between the block and the boom’s sliding surface, applying lubricant should solve the issue.
- If the sliding block is excessively deformed, it should be replaced.
- If the boom surface is damaged, polishing or repairing the surface is necessary.
Problem 2: Inconsistent Extension of the Boom Sections
Cause & Solution:
- This could be due to a malfunction in the solenoid valve, electrical circuits, or a clogged oil filter. To fix it, replace the solenoid, repair the circuits, or clean the oil filter.
Problem 3: Intermittent Movement in the Lifting Mechanism
Cause & Solution:
- Cleaning or replacing the check valve should resolve this problem.
Problem 4: Brake of the Lifting Mechanism Fails to Release
Cause & Solution:
- This could be caused by a stuck shuttle valve, internal leakage in the shuttle valve, or a piston seal failure in the brake. Disassemble the affected parts and replace any faulty seals.
Problem 5: Automatic Retraction/Extension of the Cylinder
Cause & Solution:
- The issue may lie with the cylinder itself or the balance valve. Inspect and repair or clean the affected parts, and replace any damaged components.
Problem 6: Hydraulic Oil Leakage
Cause & Solution:
- Check for damaged seals or faulty connections in the piping. Replace seals, tighten or replace connectors, and inspect the piping for damage.
Problem 7: Over-Limit Lifting Height but No Alarm Sound
Cause & Solution:
- If the alarm or over-winding relay is broken, it needs immediate repair or replacement.
Problem 8: High Return Line Pressure
Cause & Solution:
- This is often due to a clogged oil filter. Replacing the filter element should resolve the issue.
Problem 9: Slow and Weak Boom Extension
Cause & Solution:
- This problem usually stems from a fault in the hydraulic system or issues with the control valve or relief valve. Check and adjust the boom’s extension. If the problem persists, clean and replace damaged components.
By regularly maintaining and inspecting the wrecker, many of these issues can be prevented. If any of these problems arise, following the appropriate troubleshooting steps will help ensure the safe and efficient operation of the vehicle.
