The jaw crusher maintain period and how to change the new unit

Here’s a structured and concise guide to jaw crusher maintenance periods and jaw plate replacement:

1. Jaw Plate Replacement Period

Factors Affecting Lifespan:

• Material Hardness:

  • High-hardness materials (e.g., granite): Replace every 4–5 days (standard manganese steel).

  • Soft materials (e.g., dolomite): Lasts up to 2 years.

• Jaw Plate Material:

  • Manganese 13: Lasts 20+ days.

  • Alloy steel/composite materials: Longer lifespan with proper use.

• Maintenance Schedule:

  • Minor repairs (1–6 months): Adjust/replace liners.

  • Medium repairs (1–2 years): Replace jaw plates.

  • Overhaul (3–5 years): Replace eccentric shaft, movable jaw, and inspect plates.

2. Jaw Plate Replacement Steps

Preparation:

• Power off and lock out the crusher.

• Gather tools: wrenches, lifting equipment (crane/winch), new jaw plates.

Removal of Old Plates:

1. Moving Jaw Plate:

   • Loosen bolts or remove wedge/tenon strips.

   • Use a crane to lift the plate out.

2. Fixed Jaw Plate:

   • Adjust discharge opening to max width.

   • Remove bolts/connecting rods (if applicable).

Installation of New Plates:

1. Align the new plate with the slot (ensure no misalignment).

2. Secure with:

   • Bolts: Tighten evenly to avoid distortion.

   • Tenon strips: Insert into slots and lock.

Post-Installation Checks:

1. Verify discharge gap meets specifications.

2. Run 2-hour no-load test; check for vibrations/noise.

3. Conduct load test and inspect wear.

3. Maintenance Tips to Extend Jaw Plate Life

• Lubrication:

  • Replenish grease (calcium/lithium-based) every 400 hours.

  • Replace bearings every 7200 hours.

• Inspection:

  • Check for cracks/wear monthly.

  • Replace thrust plates if damaged.

• Operational Tips:

  • Pre-screen materials to avoid oversized/hard chunks.

  • Use multi-stage crushing for abrasive materials.

Summary

• Replacement Frequency: Days to years, depending on material and maintenance.

• Key to Longevity: Regular lubrication, timely replacements, and proper installation.

• Always consult the manufacturer’s manual for model-specific guidelines.

For complex replacements (e.g., eccentric shaft), involve trained technicians.

Let me know if you need further details!