A cone crusher eccentric bushing is a bronze sliding part in the eccentric assembly. It maintains the bearing surface, clearance and oil film as the assembly produces the crushing motion. If it overheats, wears or seizes, fitting a new part alone may not solve the problem. The shaft, eccentric bore, lubrication system and operating conditions should be checked first. It is one of several bronze bushings used in mining equipment.
What Is a Cone Crusher Eccentric Bushing and How Does It Work?
In many cone crushers, the eccentric assembly produces the gyrating movement that moves the mantle toward and away from the concave. The bronze bushing forms a replaceable sliding surface, controls clearance and distributes oil across the contact area.
The arrangement varies by crusher. The part may be called an inner eccentric bushing, outer eccentric bushing or eccentric sleeve bushing. In some designs, it also forms part of the stroke adjustment system. The crusher model alone cannot confirm its shape, fit or material.
Cone Crusher Eccentric Bushing Failure Signs and Possible Causes
These conditions may indicate wear, but each must be investigated within the complete crusher assembly.
| Warning sign | Possible cause | Check |
|---|---|---|
| Oil temperature exceeds its normal range | High friction, low oil flow or wrong clearance | Oil, pump, passages and clearance |
| Bronze particles appear in the filter or screen | Active wear of a cone crusher bronze bushing | Particle source and nearby bronze parts |
| Crusher lockup or seizure | Severe scoring or loss of lubrication | Main shaft, eccentric bore and oil system |
| One-sided wear | Misalignment, ovality or uneven load | Shaft, bore and feed condition |
| Scoring, smeared bronze or discoloration | Oil-film failure, contamination or local contact | Surfaces, oil path and fit |
Metso identifies crusher lockup, overheated oil and bronze filings in the hydraulic-unit screen as signs of eccentric bushing burnout. It also lists incorrect oil, lubrication failure, off-center feed, excess fines, an overly small closed-side setting and incorrect rotation among possible causes.
Damage may appear at the bushing even when the root cause is elsewhere. A new part may fail early if a worn shaft, feed problem or lubrication fault remains.
What Should Be Checked Before Replacing the Eccentric Bushing?
Start with the lubrication circuit. Record the oil grade and condition; check the pump, filter, holes and grooves; and look for blockage or contamination. Inspect the bushing, main shaft and eccentric bore for scoring, transferred bronze, taper, ovality and heat damage. Check adjacent bushings and thrust parts where applicable.
Do not use one reading from the most worn area as the original size. Measure the shaft and bore at several heights and in perpendicular directions. Metso’s HP crusher guidance, for example, specifies at least four heights and two positions 90 degrees apart. Compare the results with the limits for that model.
A worn bushing may have an enlarged bore or distorted body. Copying it can reproduce the wear instead of restoring the intended fit. Follow the OEM manual or a qualified crusher technician for repair, installation and break-in decisions.
What Information Is Needed to Manufacture a Replacement?
A cone crusher eccentric bushing RFQ should include:
- Crusher make, model, serial number and version
- Installation position and OEM part number
- Drawing and revision, or clear sample photos
- ID, OD, length, steps and other geometry
- Fits, tolerances and geometric controls
- Measured shaft and eccentric or housing-bore sizes
- Bronze grade, material standard and hardness
- Oil grooves, holes and lubrication direction
- Photos of scoring, uneven wear or seizure
- Quantity, inspection documents and delivery date
For other projects, this bronze bushing quote checklist explains the data that affect quotation.
Material shown on another supplier’s page is not automatically suitable. Leaded bronze bushings, tin bronze, aluminum bronze and other copper alloys have different properties. Use the original specification or a documented engineering review. Do not change the alloy based only on color, a generic table or the crusher model.
Need a Custom Cone Crusher Eccentric Bushing?
JEDBUSHING manufactures crusher bushings and other custom machined bronze parts from approved drawings, samples or verified replacement data. We support casting, CNC machining, oil-groove and oil-hole machining, material verification and dimensional inspection. CMM inspection and agreed reports can be arranged for critical requirements.
Send the drawing, part number, quantity, documents and delivery date through our contact page. If no drawing is available, include old-part photos and shaft and bore measurements. We will identify what is still needed before quotation.
Frequently Asked Questions
Can you manufacture a bushing for a specific crusher brand or model?
Yes, when enough technical data is available. The model and part number help, but equipment versions may use different dimensions, materials or fits.
Can I order one replacement bushing or a small batch?
Small-batch projects can be reviewed based on alloy, size, casting method, machining and inspection needs.
Can several crusher spare-part numbers be included in one RFQ?
Yes. Send a drawing list with each part number, revision, material, quantity and inspection need.
What inspection documents can be supplied?
Material and dimensional reports and CMM inspection can be arranged as agreed. UT, PT or VT may be considered when specified and applicable.
What affects production lead time?
Material, size, casting route, machining, quantity and inspection scope affect lead time. Include the planned shutdown or required delivery date.
