Why Daily Maintenance Matters
Jaw crushers operate in some of the most demanding conditions in mining and aggregate production. The combination of high loads, abrasive material, dust and vibration accelerates wear and can lead to unexpected failures if maintenance is neglected. A structured daily maintenance routine is the most cost-effective way to maximize crusher availability and extend equipment life.
Pre-Start Inspection (Before Each Shift)
1. Visual Inspection of the Crushing Chamber
- Check jaw dies for cracks, chips or excessive wear
- Verify there are no foreign objects (tools, trash, metal pieces) in the chamber
- Confirm the toggle plate and seat are properly seated and undamaged
- Check for any signs of material buildup or blockage
2. Belt Inspection
- Inspect drive belt(s) for cracks, fraying or glazing
- Check belt tension — proper deflection should be 10-15mm when pressed with moderate force
- Verify belt guard is securely in place and undamaged
- Check pulley alignment — misaligned pulleys cause rapid belt wear
3. Hydraulic System Check (if equipped)
- Check hydraulic oil level in reservoir
- Inspect hoses and fittings for leaks or damage
- Verify hydraulic pressure is within specified range
- Test safety devices (hydraulic relief valve, CSS adjustment)
4. Safety Equipment
- Confirm all guards and safety devices are in place and functional
- Test emergency stop buttons at crusher and control panel
- Verify lockout/tagout procedures are in place before any inspection
Lubrication Points — Jaw Crusher
Proper lubrication is critical to jaw crusher reliability. Key lubrication points include:
Main Bearings:
- Check oil level daily (if ring-oiled) or grease level (if grease-lubricated)
- Oil should be clean and at proper viscosity — dark or gritty oil indicates contamination
- Change oil per manufacturer schedule (typically every 250-500 operating hours)
- Use recommended lubricant grade for your operating temperature range
Toggle Plate Bearing:
- Lubricate daily with hand grease gun
- 2-3 pumps of grease per fitting is sufficient — over-greasing can cause seal damage
- Wipe fitting before injecting grease to prevent contamination
Eccentric Shaft Bearings:
- Check bearing temperature during first hour of operation
- Abnormal heat indicates insufficient lubrication or bearing damage
- Listen for unusual bearing noise — rumbling or grinding sounds signal problems
Regular Daily Inspection Extends Crusher Life
Wear Part Condition Monitoring
Jaw Dies:
- Measure remaining thickness at multiple points with calipers
- Replace when worn to 60-70% of original thickness
- Uneven wear indicates feed box problems or improper die selection
- Never operate with broken or cracked dies — damage spreads rapidly
Toggle Plate:
- Inspect for cracks, particularly at attachment points
- Measure length — elongation indicates excessive stress
- The toggle plate is a safety device — it should break under extreme overload to protect the frame
Cheek Plates:
- Check for cracks and uneven wear patterns
- Rough wear is normal — polished sections indicate misalignment
- Routine rotation (if reversible design) doubles wear part life
End-of-Shift Procedures
- Run crusher empty for 2-3 minutes after last feed to clear material
- Inspect and clean material buildup from around flywheel, jaw dies and feed hopper
- Record any unusual observations in the maintenance log
- Report any abnormal sounds, vibrations or performance changes to maintenance supervisor
- Verify area is clean and free of slip/trip hazards before leaving
Common Warning Signs to Watch For
- Metal-on-metal grinding: Indicates jaw dies are fully worn or foreign object in chamber
- Excessive vibration: May indicate loose foundation bolts, worn bearings or drive problems
- Oil discoloration or metal particles: Indicates internal wear — stop and investigate immediately
- Reduced throughput: May be caused by worn dies, incorrect CSS or feed problems
- Unusual heat: Bearings or hydraulic system running above normal temperature
A well-trained operator who performs consistent daily inspections can prevent 80% of common crusher failures and significantly reduce unplanned downtime costs.
