What causes the heavy steering wheel in BYD F3?

[Pat]

Steering gear damage can cause issues ranging from abnormal noises, heavier steering, and excessive travel to severe cases where the steering wheel becomes unresponsive, affecting driving safety. Common causes of steering gear failure include the following: 1. Power steering pump failure When testing confirms that the pump pressure of the power steering pump fails to meet standard values, it is evident that the heavy steering is related. First, check whether the mating surface of the flow control valve and valve seat or the sealing of the relief valve ball is compromised. If the flow valve or relief valve is leaking, it can be repaired by lapping. Next, check whether the relief valve spring has failed. This can be tested by adding shims behind the spring. 2. Low steering gear oil pressure: If inspection reveals low power steering oil pressure, the cause of heavy steering lies with the steering gear. In such cases, professional repair services should be sought. Generally, steering gear failures are often due to piston or cylinder scoring or damage to the piston seal ring, allowing communication between the two chambers and preventing effective pressure buildup. 3. Oil shortage: Air in the system If the power steering system lacks oil, air can enter the system, resulting not only in heavy steering but also noise during steering. This can be resolved by following the oil refill and air bleeding procedure. 4. Clogged filter: Clogged return oil filter in the reservoir If the return oil filter in the reservoir is not maintained or replaced for a long time, it can become clogged, hindering power steering oil circulation and increasing backpressure, which also causes heavy steering. 5. Seal failure: Failure of the seals on the two limit valves allows communication between the two piston chambers, leading to power steering failure.