Description
What is a Cone Crusher Step Plate Assembly?
A cone crusher Step Plate Assembly is a critical, heavy-duty thrust bearing mechanism positioned at the base of the main shaft. Its primary critical function is to support the massive vertical weight of the main shaft and crushing head while providing a durable, low-friction rotational interface during high-tonnage aggregate and mining operations. By absorbing extreme downward thrust forces and maintaining precise vertical alignment, a premium Step Plate Assembly ensures smooth closed-side setting (CSS) adjustments and protects internal drive and hydroset components from catastrophic friction damage.
Equipment Compatibility & OEM Cross-Reference
Our aftermarket replacement Step Plate Assembly components and individual sub-parts are precision-engineered to be direct-fit upgrades for Sandvik crushers, significantly lowering your Total Cost of Ownership (TCO) while ensuring zero compatibility issues and maximum field uptime.
Specification of Step Plate Assembly For Sandvik CH H CS S Series Cone Crusher
Product Name: Step Plate Assembly
Categories: Cone Crusher Spare Part > Step Plate Assembly
Application For Sandvik CH / CS / H / S Series Cone Crusher
Product Include: Main Shaft Step Plate, Step Washer, Piston Wearing Plate
Part Number List
| Model | Part Number | Description |
|---|---|---|
| CH430/CS430 | 442.7895 | Main shaft step plate |
| CH430/CS430 | 442.7894 | Step washer |
| CH430/CS430 | 442.7893 | Piston wearing plate |
| CH440/CS440 | 442.7120-01 | Main Shaft Step Plate |
| CH440/CS440 | 442.7121 | Step washer |
| CH440/CS440 | 442.7122 | Piston wearing plate |
| CH660/CS660 | 442.8732-01 | Main Shaft Step Plate |
| CH660/CS660 | 442.8731-01 | Step washer |
| CH660/CS660 | 442.8730-01 | Piston wearing plate |
| CH870 | 452.0507-001 452.2630 N11852092 | Main Shaft Step Plate |
| CH870 | 452.0537-01 | Step washer |
| CH870 | 452.0538-01 | Piston wearing plate |
| CH880 | 442.9723-01 | Main Shaft Step Plate |
| CH880 | 442.9722-01 | Step washer |
| CH880 | 442.9724-01 N11851673 | Piston wearing plate |
| CH890/CH895 | 442.9723-01 | Main Shaft Step Plate |
| CH890/CH895 | 442.9722-01 | Step washer |
| CH890/CH895 | Piston wearing plate |
Main Parts of Step Plate Assembly
1. Main Shaft Step Plate
The Main Shaft Step Plate sits at the bottom of the main shaft. It provides a stable base for the shaft to rotate. This plate takes heavy loads from crushing rocks. A strong step plate prevents misalignment and reduces wear. Fintyun uses hardened steel for long-lasting durability.
2. Step Washer
The Step Washer fits between the step plate and the piston. It helps reduce friction and wear. The washer also acts as a spacer, keeping parts aligned. Without a proper step washer, metal parts could grind and fail. Fintyun washers are precision-machined for a perfect fit.
3. Piston Wearing Plate
The Piston Wearing Plate protects the piston from damage. It absorbs impact and reduces metal-to-metal contact. Over time, this plate wears down and needs replacement. Fintyun makes tough wearing plates to extend crusher life.
Core Engineering & Technical Advantages
Because the lower thrust mechanism handles continuous vertical loads and extreme hydraulic pressure spikes during choke-feeding, standard components can quickly gall or deform. Our premium Step Plate Assembly replacements are proudly manufactured in China to deliver unmatched heavy-duty durability:
Complete Drop-In Module: Every assembly integrates the hardened main shaft step plate, precision step washer, and durable piston wearing plate, factory-matched and tested for immediate on-site installation.
Premium Bronze & Alloy Formulations: Cast from specialized high-grade alloys and hardened steel to deliver exceptional self-lubricating properties and high-load wear resistance.
Precision CNC Machining: Machined to exact OEM dimensional tolerances and flatness specifications, ensuring perfect mating surfaces that evenly distribute massive vertical thrust loads.
Optimized Lubrication Channels: Engineered to maintain continuous, even distribution of cooling hydraulic oil across the entire high-friction bearing interface, preventing thermal breakdown.
Maintenance Guidelines: When to Replace Your Step Plate Assembly
Operating a crusher with a severely worn step plate assembly will compromise vertical alignment, alter the eccentric gear mesh, and risk severe shaft scoring. We recommend inspecting the Step Plate Assembly components during routine lower mainframe maintenance:
| Inspection Focus | Warning Signs (Replace Immediately) | Best Practice Solution |
| Thickness & Clearance Wear | Component thickness has worn down beyond OEM minimum tolerances, causing the main shaft assembly to sit too low. | Replace the worn Main Shaft Step Plate or the complete assembly module to restore proper vertical alignment and CSS control. |
| Surface Scoring & Galling | Deep scratches, flaking, or metal smearing observed on the step washer or wearing plate bearing surfaces. | Swap the ruined plates immediately. Inspect the lubrication system for blocked oil filters or silica dust contamination. |
| Uneven Wear Patterns | The components exhibit heavily one-sided wear rather than a uniform flat reduction. | Replace the assembly and thoroughly inspect the hydroset piston and cylinder bushing for underlying alignment issues. |
Explore More Crusher Main Shaft Components
To maintain peak crushing volumetric throughput (TPH) and stable operation, ensure your maintenance inventory is stocked with fully compatible, premium parts. Browse our specific component categories:
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