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Also see wear notes and projects.
Crusher preparation and safe lifting
Before removing old jaw plates, lock out and tag all electrical and hydraulic systems. Allow the chamber to cool if hot work has been done. Always use lifting lugs provided on the jaw plate, checking for wear or deformation, and lift with rated slings and a spreader bar. Position your bakkie or crane to avoid pinch points. Never stand under a suspended load. Clean the seat thoroughly and remove all fines, scale or old backing compound before placing the new liner.
- Lockout/tagout required
- Use lifting lugs and certified slings
- Clean seat before fitment
Seating, bolting and first-shift checks
Dry-fit the jaw plate to ensure full seat contact and proper cheek clearance. For most modern jaws, bolt down using new OEM-grade liner bolts, torqued as per the manual. If your design uses backing compound, inspect for gaps and fill as required, following OEM cure times. Double-check the nip angle and closed side setting (CSS) before applying power. After the first shift, inspect for bolt looseness, seat fretting or early movement, catching this early prevents catastrophic breakage.
- Dry-fit and check clearances
- Torque bolts to manual spec
- Monitor after initial tonnes
Key settings before running tonnes
After securing the plates, check the CSS with feeler gauges or OEM guides. Confirm the feed is centred and not crowding one end of the jaw. Cheek plates and toggles should be in place and properly torqued, as these protect the main seats from premature wear. Only start crushing after confirming all guards are replaced and no tools are left inside the chamber. Monitor the first few tonnes closely to spot any seat bedding or abnormal noise.
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