Maintaining the gauge (or gap) on a jaw crusher is crucial for ensuring optimal performance, product size consistency, and preventing excessive wear. Here’s a step-by-step guide on how to keep and adjust the gauge (closed-side setting or CSS) of a jaw crusher:
1. Understand the Gauge (CSS)
– The closed-side setting (CSS) is the smallest distance between the fixed and movable jaw plates when the jaws are fully closed.
– This setting determines the maximum product size and affects throughput, power draw, and wear.
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2. Tools Needed
– Feeler gauges or wedge gauges (for manual measurement)
– Laser measurement tools (for modern crushers)
– Hydraulic adjustment system (if equipped)
– Wrenches, pry bars, and other basic tools
– Lockout/tagout (LOTO) equipment for safety
3. Steps to Check & Adjust Gauge
# A. Preparation
1. Shut Down Safely
– Turn off the crusher and disconnect power.
– Lock out/tag out (LOTO) to prevent accidental startup.
2. Empty the Chamber
– Ensure no material remains in the crushing chamber.
– Clean around the adjustment mechanism.
# B. Measure Current CSS
1. Manual Measurement (Feeler/Wedge Gauge Method)
– Insert feeler gauges or a wedge gauge between the jaws at multiple points.
– Measure near both ends and in the middle to check for uneven wear.
– Record measurements to track changes over time.
2. Laser Measurement (Modern Crushers)
– Some advanced crushers have laser-based sensors for real-time monitoring.
# C. Adjusting the CSS
1. Hydraulic Adjustment System (If Available)
– Use hydraulic rams to adjust the toggle plate position.
– Follow manufacturer guidelines for pressure settings.
2. Mechanical Adjustment (Shims or Toggle Plates)
– For older crushers, add or remove shims behind the toggle seat.
– Loosen bolts, adjust shims, then retighten securely.
– For some models, replace/adjust toggle plates.
3. Check & Re-Measure
– After adjustment, recheck CSS with feeler gauges.
– Ensure uniform gap across the jaws.
# D. Post-Adjustment Checks
1. Test Run
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