In a jaw crusher under normal operation, which component experiences the maximum wear and tear over time?\nSelect the part most frequently replaced during maintenance.

Introduction / Context:
Jaw crushers are primary crushers that reduce large rocks by compressive action between a fixed and a moving jaw. Knowing which parts wear fastest helps with preventive maintenance planning, spares inventory, and lifecycle cost analysis.

Given Data / Assumptions:

• Crusher type: single- or double-toggle jaw crusher.
• Material: typical mineral/rock feed with abrasiveness.
• Operating in standard duty.

Concept / Approach:
Wear correlates with rubbing, impact, and compression zones. The jaw plates (liners) form the crushing chamber where the feed is gripped and broken. They see the highest contact pressure, sliding abrasion, and impact—especially at the lower portion near the discharge where compressive work completes.

Step-by-Step Solution:

Verification / Alternative check:
Maintenance manuals and OEM recommendations schedule regular inspections and replacement of jaw liners, often with options like manganese steel or composite profiles to extend life.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming toggles wear fastest because they are moving; overlooking that toggles are primarily load-transfer/relief components while jaw plates are the working wear surfaces.

Final Answer:
Jaw plates