CH870 Mainshaft 452-0918-001 Cone Crusher shaft Replacement

CH870 Mainshaft 452-0918-001 Cone Crusher shaft

The 452-0918-001 main shaft operates under crushing force while being supported through the upper spider bearing and lower eccentric bearing system of the Sandvik CH870. Wear on the shaft surface, incorrect running clearance, lubrication failure or damage created during sleeve removal can therefore affect several expensive components during the same failure. Multiple replacement-parts catalogues identify 452.0918-001 as the CH870 Main Shaft, while some commercial databases describe the same reference within a main shaft assembly excluding mantle. Published parts data gives approximately 3925 kg as a component weight reference, while another database records 4121.2 kg as gross weight with a packing size of approximately 620 × 620 × 2840 mm. Procurement teams should confirm which weight definition applies before arranging lifting and transport. The Cone Crusher shaft should also be ordered against the equipment serial information and approved drawing rather than by CH870 model name alone because shaft condition, head configuration, sleeve design and previous machine upgrades can affect the required replacement scope. For an operating crusher, the practical acceptance criteria are not appearance or nominal weight. Journal geometry, straightness, surface condition, mating dimensions and correct hydraulic support determine whether the shaft can operate without creating excessive clearance, oil temperature or vibration.

CH870 452-0918-001 Main Shaft Parameters

Main Shaft Function and Dimensional Control

The CH870 uses a hydraulically supported main shaft that is supported at both ends. The upper end works through the spider bearing area and the lower portion operates in relation to the eccentric bearing system. The eccentric rotates at approximately 280 rpm and available eccentric throws range from 32 to 80 mm depending on the crusher configuration. This arrangement allows the crushing head to perform the required gyrating motion while the Hydroset system controls main shaft position and crusher setting. The 452-0918-001 shaft must therefore maintain its designed geometry while carrying changing radial and axial loads generated by crushing. Manufacturing inspection should include the principal shaft diameters, sleeve interface, bearing surfaces, shoulder positions, straightness, concentricity, surface finish and all drawing controlled transition areas. A single diameter measurement is not sufficient for a shaft of this size. Measurements should be taken at several axial positions and different angular locations so taper, ovality and localized wear can be identified. The final material specification and heat treatment condition should follow the approved engineering drawing because public parts lists do not provide enough reliable information to assign one universal steel grade to every production revision. Buyers sourcing cone crusher spare parts should request dimensional inspection records and material traceability when these documents form part of the purchase specification.

High Risk Failure Caused by Shaft Sleeve Damage and Lubrication Problems

A common high cost failure develops when wear around the shaft sleeve or bearing interface is ignored until the mating surface of the main shaft is damaged. Maintenance personnel sometimes find that a sleeve has become difficult to remove and use uncontrolled grinding, heating or cutting close to the shaft surface. One cut entering the parent shaft can create a stress concentration or remove material from a precision fit area. Sandvik has specifically developed a conical main shaft sleeve concept for supported crusher models to reduce the need for grinding and heating during sleeve replacement, which illustrates how serious shaft damage during maintenance can become. Lubrication problems create another failure path. Contaminated oil, insufficient flow or abnormal operating clearance can increase local friction, after which technicians may find scoring, polishing, discoloration or metallic debris. Replacing only the damaged sleeve or bushing without measuring the shaft can save money on the purchase order but increase total maintenance cost. If the shaft surface is already tapered or scored, the replacement mating component can develop abnormal contact and fail again. The lower cost approach is to measure the shaft during every major dismantling, inspect lubricant condition and determine the cause of abnormal wear before installing new components.

Installation Controls for 452-0918-001

Installation should start with inspection of the replacement shaft before the existing crusher is dismantled. Verify the 452.0918-001 reference, compare major dimensions with the approved drawing and inspect all machined surfaces for corrosion, transport damage or impact marks. The published weight of approximately four tonnes means the lifting arrangement must be planned so slings, hooks and chains cannot contact precision shaft surfaces. After removal of the existing main shaft, inspect the spider bearing area, eccentric bearing interface, main shaft sleeve, head center, main shaft step and related lubrication components. Clean oil passages and mating surfaces before measurement. If the removed shaft shows uneven polishing on one side, do not assume that replacing the shaft alone corrects the problem. Uneven wear may indicate excessive clearance, eccentric component wear, alignment problems or abnormal loading. Check mating components before assembly. During installation, follow the correct service method for the shaft sleeve and avoid uncontrolled flame heating or grinding that could alter shaft geometry. Once assembly is completed, verify lubrication flow and hydraulic functions before introducing feed. The crusher should be commissioned while monitoring main shaft position, oil temperature, hydraulic pressure, vibration and mechanical noise. Baseline readings taken immediately after a controlled installation are valuable because later measurements can be compared with a known condition.

Engineer Installation Advice

Engineer recommendation Treat the 452-0918-001 replacement as a complete clearance inspection job rather than a shaft change. Before assembly I would record the new shaft dimensions, existing mating dimensions and previous shaft wear on the same inspection sheet. Pay particular attention to the regions where the sleeve, spider support and eccentric related components interact with the shaft. If the removed shaft has localized scoring, blue discoloration or directional wear, find the mechanism that produced those marks before installing the new component. I would also protect the machined surfaces with nonmetallic lifting protection during every movement in the workshop. A four tonne shaft can easily damage itself if a sling shifts and a journal contacts a steel structure. During commissioning, start with verified lubrication and hydraulic pressure, then apply crushing load progressively. A rapid temperature increase or sudden vibration change after overhaul should be investigated immediately rather than treated as a normal bedding in condition.

Maintenance and Operating Cost Control

The CH870 is designed for secondary, tertiary, quaternary and pebble crushing duties and can operate with substantial crushing power, so preventing abnormal load from reaching the shaft system has direct economic value. Tramp metal is one important risk because a sudden pressure peak can transmit severe mechanical loading through the crushing assembly. The crusher protection and Hydroset systems should therefore remain functional and should never be bypassed to maintain short term production. Main shaft condition is also closely connected to lubrication. Trend oil temperature instead of recording only whether it is below an alarm limit. A gradual increase over several weeks can reveal developing clearance, contamination or lubrication problems before visible shaft damage occurs. Oil inspection after unusual operating events can also provide useful evidence. Bronze particles may indicate wear in mating components while steel particles require investigation of rotating or load carrying surfaces. During planned shutdowns inspect the shaft sleeve area, verify accessible clearances and examine seals that prevent contamination from entering the lubrication system. Preventing damage to 452-0918-001 is normally less expensive than replacing the shaft together with head, sleeve, eccentric and bearing related components after a lubrication or overload event.

Ordering the Correct CH870 Main Shaft

Use 452.0918-001 as the main component reference but confirm the scope of supply in writing. Published catalogues also identify 452.0917-901 as a CH870 main shaft assembly and 452.0919-001 as the head center, so the buyer should establish whether the quotation covers only the shaft or a larger assembled group. This distinction is particularly important because published weight data varies according to whether the source describes finished component weight or shipping gross weight. Approximately 3925 kg appears as a component weight reference while approximately 4121.2 kg appears as a gross weight reference. Before issuing the purchase order, confirm actual finished weight, packing dimensions, drawing revision, shaft dimensions, surface requirements, material certification requirements and included components. If the crusher has undergone previous upgrades, provide the serial information and photographs of the removed shaft and mating components. Correct technical verification before production costs far less than discovering a dimensional difference after a CH870 has been dismantled for a scheduled shutdown.

CH870 Main Shaft FAQ

Is 452-0918-001 a shaft or a complete main shaft assembly

Most CH870 aftermarket parts databases identify 452.0918-001 as the Main Shaft itself. Some commercial listings describe the reference as a main shaft assembly excluding mantle, while 452.0917-901 is also published as a CH870 main shaft assembly reference. For this reason, the supplier should define the exact scope of supply and provide an assembly drawing or component list before the order is approved.

What should be checked before installing the CH870 main shaft

Check shaft dimensions, straightness, bearing and sleeve surfaces, mating clearances, spider bearing condition, eccentric related components, lubrication passages and the condition of the main shaft sleeve. Inspect every machined surface for transport damage. Compare the new component measurements with the approved drawing rather than relying only on the part number and external appearance.

How can premature wear of the Cone Crusher shaft be reduced

Maintain correct lubrication flow and cleanliness, keep the Hydroset and overload protection systems operational, prevent uncontrolled sleeve removal methods and investigate changes in oil temperature or vibration early. During major maintenance, measure shaft surfaces for taper and ovality and inspect mating components for abnormal clearance. Correcting the source of wear before installing replacement components reduces the risk of repeated shaft, sleeve and bushing damage.