Description
What is a Cone Crusher Arm Liner / Arm Guard?
A cone crusher Arm Liner / Arm Guard is a critical, heavy-duty sacrificial protective casting mounted securely over the inner structural arms of the main bottom shell. Its primary critical function is to physically shield the vulnerable mainframe arms from continuous, high-velocity abrasive rock impacts and heavy aggregate scouring during choke-feeding operations. By absorbing intense multi-directional kinetic wear and preventing structural housing fatigue, a premium Arm Liner / Arm Guard extends the operational lifespan of the entire bottom shell assembly and ensures long-term crushing stability.
Equipment Compatibility & OEM Cross-Reference
Our aftermarket replacement Arm Liner / Arm Guard components are precision-engineered to be direct-fit upgrades for Sandvik crushers, significantly lowering your Total Cost of Ownership (TCO) while ensuring zero installation issues and maximum field uptime.
| Supported Brands | Applicable Crusher Series | Common OEM Part Numbers |
| Sandvik | Stationary Cone Crushers: CH Series: CH420, CH430, CH440, CH660, CH870, CH880, CH890, CH895 CS Series: CS420, CS430, CS440, CS660 H Series: H2800, H3800, H4800, H6800, H7800, H8800 S Series: S2800, S3800, HS800 | Pinion Shaft Arm Liner: 442.6174-01, 442.7915-01, 442.7140-00, 442.8760-00, 452.1066-901 Narrow Arm Liner: 442.6175-01, 442.7914-01, 442.7141-00, 442.7141-01, 442.8759-00 (Matches standard OEM specifications) |
Core Engineering & Technical Advantages
Because the lower frame arms sit directly in the severe path of raw aggregate flow, standard steel shields can wear through rapidly or crack under kinetic shock. Our premium Arm Liner / Arm Guard replacements are proudly manufactured in China to deliver superior, heavy-duty durability:
High-Grade Manganese Alloys: Cast from premium manganese steel (such as Mn14, Mn18, or custom work-hardening alloys) that continuously work-harden under heavy impact, maximizing surface abrasion resistance.
Precision Casting & Fitment: Manufactured to exact OEM dimensional tolerances to match the exact profile of the bottom shell arms, ensuring a tight, vibration-free fit that prevents shifting during operation.
Structural Impact Absorption: Engineered with optimized thickness profiles to absorb massive shock loads without fracturing, actively shielding the costly structural bottom shell mainframe underneath.
Cost-Effective Wholesale Supply: Factory-direct production eliminates middleman markups, providing a high-ROI, easily replaceable wear layer for global mining and quarry operations.
Maintenance Guidelines: When to Replace Your Arm Liner / Arm Guard
Operating a crusher with a worn-through arm guard will directly expose the main bottom shell casting to destructive abrasive scouring and structural compromise. We recommend thoroughly inspecting the Arm Liner / Arm Guard during major maintenance turnarounds:
| Inspection Focus | Warning Signs (Replace Immediately) | Best Practice Solution |
| Material Thickness | The manganese thickness has worn down past the critical service limit, nearly exposing the underlying bottom shell arm. | Replace the Arm Liner / Arm Guard immediately to prevent irreversible abrasive damage to the mainframe. |
| Physical Deformation | Severe cracking, bending, or structural fracturing across the shield body caused by massive tramp iron impact. | Swap the damaged guard to ensure continuous structural protection and prevent metal fragments from falling into the lower circuit. |
| Mounting Security | The guard rattles loosely during operation or shows worn, elongated mounting bolt holes. | Pull the component. If the fit is compromised, replace it to prevent the shield from detaching and jamming the lower assembly circuit. |
Explore More Crusher Bottom Shell & Wear Components
To maintain peak crushing volumetric throughput (TPH) and protect your investment, ensure your maintenance inventory is stocked with fully compatible, premium parts. Browse our specific component categories:
Find precision-cast Concave Liners and Main Frame Liners for complete Sandvik bottom shell rebuilds.
Explore our robust aftermarket spares for Sandvik CH & CS Series Crushers.
View high-performance replacement Inner Head Nut For Sandvik Cone Crusher and Main Shaft Assemblies for Sandvik cone crushers.
