Jaw Crusher Wear Parts
Four important jaw crusher wear parts are the fixed jaw die, movable jaw die, toggle plate and Side Liners. Their condition affects throughput, product size and safe operation, and should be included in maintenance planning.
Understanding Wear Patterns
Jaw die wear varies across the chamber. The upper movable jaw die faces feed impact and abrasion, with severity depending on the feed and chamber profile. The lower discharge area faces repeated compression and wear in the discharge zone. Record the following areas separately during inspection:
- Upper zone: feed impact and tooth profile wear
- Middle zone: tooth wear and effective material grip
- Lower zone: discharge setting and remaining thickness
Because wear is uneven, rotatable jaw dies must be assessed for rotation according to the machine manual, including seating, fastening and remaining thickness. Do not rotate excessively thin or damaged dies merely to extend service.
Selecting the Tooth Profile
Jaw die tooth profiles affect crushing performance:
| Tooth Profile | Characteristics | Application Considerations |
|---|---|---|
| Coarse / Deep Teeth | Emphasis on grip and space for fines to pass | Primary crushing with large feed |
| Intermediate Teeth | Balance between reduction ratio and throughput | Secondary crushing with intermediate feed sizes |
| Fine / Flat Teeth | Flatter tooth faces; check feed and power requirements | Fine Crushing |
| Corrugated Teeth | Distributed loading across the tooth profile | Hard, highly abrasive material |
An unsuitable tooth profile can affect throughput, product size and specific energy use. For Manganese Steel liners, the tooth profile also affects work hardening by changing the distribution of local impact and pressure.
Selecting Materials for the Duty
Moderate Abrasion and Impact
Mn13Cr2 (ZGMn13-2) is a common jaw crusher material. Correct solution treatment and quenching provide impact toughness and work-hardening capability.
Highly Abrasive Service
For highly abrasive ore, evaluate materials against actual impact loading and microstructure requirements, including Mn18Cr2 or Mn22Cr2. Higher manganese content does not necessarily mean longer life; assess composition, microstructure and impact energy together. Composite constructions also require drawing-based assessment, for example Mn13+Cr26 composite liners.
Low-Impact / Fine Crushing Duties
Where impact energy is insufficient for effective work hardening, as may occur in fine crushing, high-chromium cast iron (Cr26) jaw dies require assessment of brittle-fracture risk, maximum feed size and tramp impact. Hardness or a general description of low-impact duty does not establish suitability as a manganese steel replacement.
Deciding When to Replace Parts
Plan replacement before severe failure occurs:
- Remaining thickness reaches the machine's replacement limit— measure at the thinnest point
- Product size falls outside specification— the discharge setting can no longer be adjusted to meet requirements
- Persistent, abnormal throughput loss— worn teeth no longer grip material effectively
- Visible uneven wear— one side is substantially thinner
- Cracks or spalling— particularly at tooth roots
Installation considerations
- Inspect the Jaw Frame for wear or deformation
- Prepare seating surfaces to the machine specification; use the specified backing only where required by the original design, without improvised fillers or altered seating.
- Tighten to the Specified Torque
- Check Feed Distribution— distribute feed evenly to reduce uneven loading and localized excessive wear
OEM Fitment Checks
Major OEM brands use proprietary jaw die designs. Confirm dimensional compatibility before ordering replacements. ANRANST maintains dimensional information for brands including Metso, Sandvik and others. Contact Us for part cross-reference support.