What Causes Power Steering Fluid Leakage?
2 Answers
Power steering fluid leakage is primarily caused by aging or damaged oil seals inside the cavity, resulting in poor sealing and fluid seepage. Common leakage points on the steering gear include: the upper cover, side end cover, and the connection point between the steering shaft and pitman arm. These three locations all have sealing rings, and replacing them with new oil seals and O-rings can resolve the issue. If leakage occurs elsewhere, it may indicate casting defects (sand holes) or cracks in the steering gear housing. Minor cracks and sand holes can be sealed using Loctite 290 high-permeability sealant. If replacing seals and applying sealant still fails to stop the leak, the entire steering gear assembly must be replaced. To prevent this, avoid frequently turning the steering wheel to its extreme limits and refrain from dry steering (turning wheels while stationary), as these habits accelerate oil seal wear and cause steering system damage leading to leaks.
As an experienced auto mechanic, I've seen countless cases of power steering fluid leaks, primarily due to seal deterioration. The various rubber seals on the steering gear - such as input shaft seals or output shaft seals - harden and crack over time. High temperatures and mileage accelerate this process, causing gradual fluid seepage. Other common causes include cracks in the steering gear housing (from impact or metal fatigue), loose or damaged fluid line connections, and internal component wear (like failed gearbox or piston seals). The high-pressure system magnifies these issues, potentially leading to complete power steering failure - a serious safety hazard. My advice: regularly check fluid levels, address leaks immediately, and always use the correct fluid type during changes to prolong seal life and avoid costly repairs.
