bearing slewing ring

Start With the Machine, Part Number, or Drawing

A replacement bearing must match the equipment interface and the application duty. The fastest starting point is the machine make, model, serial number, bearing part number, and photos of the identification marks. This route helps distinguish machines that share a model family but use different bearings by production year or configuration.

An approved bearing or equipment drawing provides a stronger dimensional basis. Send the outside and inside diameters, overall height, mounting-hole pattern, locating features, gear data, rotating ring, seals, lubrication ports, and required clearance or preload. Mark the drawing revision so the quote and the manufactured bearing refer to the same interface.

An old sample can support reverse engineering when the original records are unavailable. Pair it with measurements from the machine structure and any historical drawings because wear, distortion, corrosion, or previous repair work can alter the removed part.

Matching routes

Data Needed to Match a Slewing Ring Bearing

The selection starts with a load case, motion profile, interface, and service environment. Provide values with units and identify which loads occur at the same time. A list of separate maximum values does not show the internal load distribution if those peaks occur in different machine states.

Loads and motion

• Axial load, radial load, and overturning moment for each operating, parked, test, and exceptional condition
• Rotation speed or oscillation angle, cycles per day, duty cycle, acceleration, braking, and reversals
• Shock, vibration, emergency stop, wind, slope, or tool loads that reach the bearing interface
• Required service life, allowable clearance or preload, stiffness, and rotational accuracy

Machine interface

• Available outside diameter, bore, overall height, bolt circles, hole sizes, and locating features
• Fixed ring, rotating ring, mounting orientation, adjacent structure thickness, flatness, and stiffness
• Internal gear, external gear, or gearless configuration; pinion and center-distance data for geared bearings
• Space for seals, grease fittings, fastener access, lifting, and future removal

Environment and order scope

• Operating temperature, dust, mud, water, salt, corrosion, cleaning method, and storage conditions
• Material, heat treatment, coating, sealing, lubrication, inspection, and traceability requirements
• Quantity, prototype or production status, target delivery date, shipping destination, and required documents

Bearing Slewing Ring Options

These four product groups provide starting points for equipment replacement and new-machine selection. Confirm the final model against the machine serial number, approved interface drawing, and operating loads.

Silver external-gear slewing bearing with two circular mounting-hole patterns on a white background.

Couronnes d'orientation pour équipements forestiers

Replacement slewing bearings for log loaders, harvesters, and other forestry equipment. The published range includes part-number and machine-model references for selected Prentice, CAT, Timberking, John Deere, Timberjack, and Barko equipment.

• MatériauPublished material: tempered 42CrMo
• Part numbersMatching references include PR10000709, PR10002614, PR100177, JDF124578, and selected Barko 541-series part numbers
• Machine referencesExample machine references include Prentice 120C/120E/120, John Deere 435/435C/437C/335C, Timberjack 430B, and selected Barko loaders and harvesters
• Matching optionOld-sample mapping is available when original documentation is incomplete

Ask About Your MachineView Forest Equipment Bearing Details

Dark-finished external-gear crane slewing bearing with two rows of large mounting holes.

Couronnes d'orientation de grue

Slewing bearings for selected crawler and tower crane replacement applications. Machine-model matching is available for published references covering TADANO, KATO, Kobelco, Hitachi, Potain, Comedil, Simma, and Topkit equipment.

• MatériauPublished material: tempered 40CrMo
• Crawler crane referencesCrawler crane references include NK400E-3, TR250M-4, TR500M, Kobelco 5035/5045/7035/7055/7065, and Hitachi KH150
• Tower crane referencesTower crane references include selected Comedil CT-603, Potain, Simma, and Topkit models
• Selection inputsSelection requires the complete crane load combinations, gear drive data, mounting structure, and machine configuration

Submit a Crane ModelView Crane Bearing Details

Dark-finished internal-gear excavator slewing bearing with a circular outer mounting-hole pattern.

Couronnes d'orientation de pelleteuse

Aftermarket slewing bearings for excavator upperstructure rotation. The published machine list covers selected Hitachi and Komatsu models, with additional matching support for CAT, Volvo, SANY, and other excavator applications.

• MatériauPublished material: tempered 50Mn
• Hitachi referencesHitachi references span compact through large models, including EX, ZX, and UH series entries
• Komatsu referencesKomatsu references include selected PC and PW series entries
• Matching inputsFinal matching uses the complete machine model, serial number, part number, pinion data, mounting pattern, and bearing height

Match an Excavator BearingView Excavator Bearing Details

Low-profile dark external-gear slewing bearing shown at a shallow angle on a white background.

Couronne d'orientation avec engrenage extérieur

An external gear allows a pinion to drive the rotating ring while the bearing carries axial, radial, and overturning loads. This published internal-flange series is intended for compact, medium-load arrangements such as light robotic arms, packaging equipment, and warehouse machinery; shock-loaded applications require a separate gear and load review.

• ModelsSW-414W.20 to SW-1094W.20
• Outside diameter D504–1,198.4 mm (19.84–47.18 in.)
• Bore d304–984 mm (11.97–38.74 in.)
• Overall height H56 mm (2.20 in.)
• Module d'engrenage5, 6, or 8
• Tooth count99–148
• Published weight30–83 kg (66–183 lb)

Request a Series DrawingView External Gear Bearing Details

Verify the Mounting Interface and Gear Mesh

Dimensional interchangeability requires every mounting relationship to fall within its approved tolerance. A small change in bearing height can shift the pinion contact position, while a hole-pattern or pilot-fit difference can prevent assembly or transfer load incorrectly. The rotating-ring choice also determines how the bearing connects to the drive and where cables, hoses, and lubrication points move.

The support structure affects bearing performance after installation. Record the mounting-face flatness, stiffness, plate thickness, weld locations, pilot fits, coating thickness, and fastener access. The mating surfaces must be clean and flat, and the connection must provide uniform clamping. Installation bolt grade, preload method, and tightening sequence belong in the approved installation plan.

A geared replacement must preserve the intended mesh across the full rotation. Gear geometry establishes the nominal center distance and tooth engagement; bearing and pinion runout then change the working backlash around the circumference. The approved installation method should set backlash at the marked maximum-runout position and verify the contact pattern before the machine returns to service.

Match Loads, Motion, and Service Life

Static selection checks the rolling raceway and the bolted connection against the same load cases. A bearing is not confirmed when only one catalog load value passes. The adjacent structure must also remain stiff and flat enough to distribute load around the rings and bolts.

Service-life work uses the actual motion and load spectrum. Slow full rotation, continuous rotation, and small-angle oscillation place different demands on the raceway and lubricant. Starts, stops, reversals, shock events, contamination, corrosion, and lubrication intervals can control field life even when the maximum static condition is acceptable.

For geared bearings, the review also covers tooth contact capacity, tooth-root strength, pinion load, backlash, lubrication, and drive events. Multiple pinions require a load-sharing assessment because structure deflection and installation variation can prevent equal torque distribution.

Engineering output to request: selected bearing and drawing revision · controlling load cases · raceway and bolt review · gear review when applicable · life basis · installation assumptions · verification plan

Freeze the Drawing, Then Verify the Built Bearing

Production should begin from an approved drawing and a frozen technical specification. The approval package identifies the dimensions, tolerances, material, heat treatment, gear, clearance or preload, sealing, lubrication, marking, inspection, and document requirements that apply to the order. Any later change to a critical item requires a reviewed drawing revision.

SWBTEC process inspection can cover incoming forging appearance and dimensions, ultrasonic inspection after rough turning, overall hardness after tempering, raceway hardness and hardened-layer depth, crack inspection, hole geometry, ring flatness, and assembly rotation. Applicable checks depend on the bearing design and the agreed inspection plan.

Final inspection can record overall height, rotation condition, axial and radial clearance, ring runout, raceway hardness, diameters, mounting holes, and bolt-circle dimensions. For geared products, the agreed record can also include gear radial runout, tooth thickness, and related gear characteristics. Tie the report to the model, serial or batch number, order, and approved drawing revision.

Build a Quote That Can Be Compared

A useful quote defines the same technical and commercial scope you will use to compare suppliers. Bearing structure, dimensions, material, heat treatment, precision, gear requirements, seals, quantity, and delivery schedule establish the base scope. Custom engineering, tooling, sample validation, special inspection, third-party testing, and expedited production can change the price and lead time.

State which deliverables belong with the bearing. Depending on the order, these may include an approved drawing, material documents, inspection report, conformity statement, installation and maintenance instructions, packing list, and agreed certificates. Define export packing, corrosion protection, shipping terms, destination, and responsibility for freight, insurance, duties, and customs clearance.

Standard references and custom replacements follow different schedules, so SWBTEC confirms lead time after the model, quantity, technical scope, and document package are clear.

Quote checklist: bearing and drawing revision · quantity · unit and tooling scope · inspection and documents · packaging · shipping term and destination · target date · quote validity

Questions fréquemment posées