Delayed Steering in Wheel Excavator: Causes and Solutions

One common issue in wheel excavators is the problem of delayed steering. This can significantly affect the efficiency and maneuverability of the machine. To troubleshoot and resolve this issue, a systematic inspection of various components is necessary. Here are the potential causes and their corresponding solutions for delayed steering in wheel excavators.

1. Check Hydraulic Oil:

• The quantity and quality of hydraulic oil directly impact the steering system's functionality. Insufficient hydraulic oil can result in delayed steering due to inadequate supply to the hydraulic pump.
• Ensure hydraulic oil is at the specified level. If the oil is dirty or contains impurities, it can lead to internal leaks, damaging seals or components. Regularly inspect and replace hydraulic oil to maintain system integrity.

2. Inspect Steering Cylinder:

• Wear or damage to the piston and seals in the steering cylinder can contribute to internal leaks, causing slow steering response.
• Replace the steering cylinder with one from a machine with normal steering to determine if the issue persists. If steering improves after replacement, inspect and repair the original steering cylinder.

3. Check for Air in the Hydraulic System:

• Even a small amount of air entering the hydraulic system can significantly impact its efficiency, leading to slow steering.
• Check for loose connections or damaged pipes in the steering pump suction line. Ensure the steering pump seal is intact. Maintain proper oil levels in the tank to prevent exposure of suction or return lines to air.
• Start the engine and turn the steering wheel while observing the hydraulic tank. If bubbles are present, air has entered the system and must be eliminated.

4. External Hydraulic Leaks:

• External oil leaks can result in a loss of hydraulic pressure, causing instability in the steering system.
• Inspect hydraulic connections, seals, and pipes for leaks. Promptly repair any identified external leaks to maintain hydraulic system efficiency.

5. Central Rotation Joint Inspection:

• Severe wear on the inner cylinder surface or damaged seals in the central rotation joint can cause collisions within the oil and gas systems, affecting overall performance.
• Thoroughly inspect the central rotation joint for wear and tear. If significant damage is found, consider replacement or repair to ensure smooth operation.

Final Check on Steering Motor:

• After inspecting the mentioned components, conduct a detailed examination of the steering motor.
• Check for excessive wear on the working surfaces of the stator and rotor or the working surface of the steering valve. Severe wear can reduce the actual high-pressure oil entering the steering cylinder, leading to delayed steering.
• If the steering cylinder and central rotation joint are in good condition, perform a final check on the steering motor. If wear is detected, prompt repair or replacement is necessary.

Addressing these potential causes step by step will help identify and resolve the issue of delayed steering in wheel excavators, ensuring optimal performance and safety. Regular maintenance and timely repairs are crucial for extending the lifespan of hydraulic components and enhancing overall machine efficiency.