Description
What is a Cone Crusher Main Shaft Assembly?
A cone crusher Main Shaft Assembly is the central structural axis of the machine. Its primary critical function is to support the moving crushing head, transmit rotational torque, and maintain precise operating geometry under extreme crushing forces. By anchoring the head and enduring massive multi-directional impact loads during high-tonnage aggregate production, a premium Main Shaft Assembly ensures stable closed-side setting (CSS) performance and protects internal drive and hydroset components from catastrophic failure.
Equipment Compatibility & OEM Cross-Reference
Our aftermarket replacement Main Shaft 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 Main Shaft Assembly
Product Name: Main Shaft Assembly / Mainshaft Assembly
Catégories: Spare Part > Pour concasseur à cône Sandvik > Main Shaft Assembly
Included Parts: Main Shaft, Main Shaft Sleeve, Inner Head Nut, Head Nut With Burning Ring, Concave Ring, Head Center, Dust Seal Ring, Dust Seal Retainer
Applicable Models:
CH420, CH430, CH440, CH660, CH870, CH880, CH890, CH895 Sandvik Crusher
CS420, CS430, CS440, CS660 Sandvik Crusher
H2800, H3800, H4800, H6800, H7800, H8800 Sandvik Crusher
S2800, S3800, HS800, HS800 Sandvik Crusher
Part Number List
| Model | Part Number | Description |
|---|---|---|
| CH430/CS430 | 442.8313-902 | Main Shaft Assy |
| CH430/CS430 | 442.7902-01 | Main Shaft |
| CH430/CS430 | 442.7913-01 | Main shaft sleeve |
| CH430/CS430 | 442.7895-01 | Main Shaft Step Plate |
| CH430/CS430 | 442.7918-01 | Inner Head Nut |
| CH430/CS430 | 442.7912-00 | Head Nut With Burning Ring |
| CH430/CS430 | 442.7910-01 | Head Center |
| CH430/CS430 | 442.8017-01 | Dust Seal Ring |
| CH430/CS430 | 442.8020-01 | Dust Seal Retainer |
| CH440/CS440 | 442.7259-00 | Main Shaft Assy |
| CH440/CS440 | 442.7100-01 | Main Shaft |
| CH440/CS440 | 442.7117-01 | Main shaft sleeve |
| CH440/CS440 | 442.7120-01 | Main Shaft Step Plate |
| CH440/CS440 | 442.8333-01 | Inner Head Nut |
| CH440/CS440 | 442.7105-01 | Head Nut With Burning Ring |
| CH440/CS440 | 442.8332-01 | Head Center |
| CH440/CS440 | 442.7102-01 | Dust Seal Ring |
| CH440/CS440 | 442.7103-01 | Dust Seal Retainer |
| CH660/CS660 | 452.4222-901 | Main Shaft Assy |
| CH660/CS660 | 442.8767-01 | Main Shaft |
| CH660/CS660 | 442.8792-01 | Main shaft sleeve |
| CH660/CS660 | 442.8732-01 | Main Shaft Step Plate |
| CH660/CS660 | 442.8791-01 | Inner Head Nut |
| CH660/CS660 | 442.8800-01 | Head Nut With Burning Ring |
| CH660/CS660 | 442.8763-01 452.4311-001 | Head Center |
| CH660/CS660 | 442.8802-01 | Dust Seal Ring |
| CH660/CS660 | 442.8801-01 | Dust Seal Retainer |
| CH870 | BG00568048 | Main Shaft Assy |
| CH870 | 452.0918-001 452.5504 | Main Shaft |
| CH870 | 452.0505-001 N11852091 | Main shaft sleeve |
| CH870 | 452.0507-001 452.2630 N11852092 | Main Shaft Step Plate |
| CH870 | 452.0930-001 N11852064 | Inner Head Nut |
| CH870 | 452.0936-901 N11852063 | Head Nut With Burning Ring |
| CH870 | 452.0919-001 452.5504 | Head Center |
| CH870 | 452.0924-001 BG00663892 | Dust Seal Ring |
| CH870 | 452.0921-001 N11852093 | Dust Seal Retainer |
| CH880 | 452.4291-901 | Main Shaft Assy |
| CH880 | 899.0336-00 | Main Shaft |
| CH880 | 442.9294-01 | Main shaft sleeve |
| CH880 | 442.9723-01 | Main Shaft Step Plate |
| CH880 | 899.0244-00 442.9269-01 | Inner Head Nut |
| CH880 | 442.9270-00 | Head Nut With Burning Ring |
| CH880 | 452.0320-01 | Head Center |
| CH880 | 442.9271-01 | Dust Seal Ring |
| CH880 | 442.9272-01 | Dust Seal Retainer |
| CH890/CH895 | 452.6419-901 BG00505358 | Main Shaft Assy |
| CH890/CH895 | 452.6421-901 | Main Shaft |
| CH890/CH895 | 442.9294-01 | Main shaft sleeve |
| CH890/CH895 | 442.9723-01 | Main Shaft Step Plate |
| CH890/CH895 | 899.0244-00 442.9269-01 N11851563 | Inner Head Nut |
| CH890/CH895 | 442.9270-00 442.9270-01 | Head Nut With Burning Ring |
| CH890/CH895 | 452.6424 | Head Center |
| CH890/CH895 | 452.6048-001 | Dust Seal Ring |
| CH890/CH895 | 452.6045-001 | Dust Seal Retainer |
Core Engineering & Technical Advantages
Because the main shaft handles continuous, brutal mechanical stresses and heavy kinetic shocks during mineral reduction, standard shafts are prone to bending or metal fatigue. Our premium Main Shaft Assembly replacements are proudly manufactured in China to deliver unmatched heavy-duty durability:
Complete Drop-In Module: Every assembly integrates the main shaft, shaft sleeve, step plate, inner head nut, head center, and dust seal components, factory-matched and tested for immediate on-site installation.
High-Strength Forged Steel: Forged from premium alloy steel (such as 42CrMo) to deliver exceptional tensile strength and torsional rigidity, preventing the shaft from flexing or snapping under heavy loads.
Precision CNC Machining: Bearing journals, sleeves, and threading interfaces are machined to exact microscopic tolerances, ensuring a flawless, zero-vibration fit for mating components.
Advanced Heat Treatment: Undergoes specialized quenching and tempering processes to maximize core structural toughness while providing a hardened exterior surface that resists abrasive wear and fretting.
Maintenance Guidelines: When to Replace Your Main Shaft Assembly
Operating a crusher with a bent, deeply scored, or fatigued main shaft will rapidly destroy your internal bushings and lead to catastrophic gear failure. We recommend thoroughly inspecting the Main Shaft Assembly during major drive train overhauls:
| Inspection Focus | Warning Signs (Replace Immediately) | Best Practice Solution |
| Shaft Runout & Bending | Dial indicator measurements show the main shaft is bent or warped beyond acceptable OEM maximum tolerances. | Replace immediately. A bent shaft will generate immense structural vibration, rapidly destroying surrounding bronze bushings and gears. |
| Bearing & Sleeve Journal Wear | Deep scoring, fretting, or a measurable reduction in diameter on the shaft areas where sleeves and bearings seat. | Replace the worn Main Shaft Sleeve or the complete assembly module to restore proper clearance tolerances. |
| Thread Profile Damage | Thread clearance exceeds acceptable tolerances or shows visible stripping on the upper mounting zones. | Pull the damaged assembly component and replace it to prevent in-operation loosening of the head components. |
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:
Find precision-machined Inner Head Nut For Sandvik Cone Crusher and Main Shaft Assemblies for complete Sandvik rebuilds.
Explore our robust aftermarket spares for Sandvik CH & CS Series Crushers.
View high-performance replacement Spherical Roller Bearings and Step Plate Assemblies for Sandvik cone crushers.
