Here's why:
* Cost: The cost of the bearings, special tools required (likely a bearing press), and the labor involved will likely exceed the cost of a replacement air pump. Used air pumps are readily available and relatively inexpensive.
* Complexity: Disassembling the air pump to access the bearings requires specialized knowledge and tools. The pump's internal components are precisely engineered and easily damaged during disassembly and reassembly.
* Reliability: Even if successfully replaced, there's no guarantee the repaired pump will function reliably or for a long period. The remaining components may be worn or damaged.
* Availability of Parts: Sourcing individual bearings for a 30+ year-old air pump may be difficult or impossible.
In short, replacing the bearings is a complex and potentially costly endeavor with a questionable return on investment. Replacing the entire air pump is a far more efficient and cost-effective solution.
