Product Details

Slewing Bearing Installation & Maintenance Guide

External Gear Slewing Bearing Rust Prevention Treatment

Internal Gear Slewing Bearing Manufacturers

FDON slewing bearings require proper installation and maintenance to achieve maximum performance and durability. These bearings, including double row ball and three row roller types, support heavy axial, radial, and tilting moment loads in engineering machinery. Proper installation ensures accurate alignment, smooth rotation, and reduced wear. Regular maintenance, such as lubrication, inspection for wear or corrosion, and checking bolt tightness, extends service life and prevents downtime.

Specification

FDON slewing bearings play a vital role in heavy engineering machinery. Their performance depends not only on design and quality but also on proper installation and maintenance. This guide covers key practices for double row ball and three row roller bearings used in excavators, cranes, concrete pumps, and aerial platforms.

NO.	De	D	d	H	b	m	z	x	k	Q&T	KG
011.20.400	499		325	55	46	5	97	+0.5	0.1	44	37
011.20.450	554		369	55	46	5	108	+0.5	0.1	44	41
011.30.500	629	602	398	80	60	5	123	+0.5	0.1	52	89
012.30.500	628.8	602	398	80	60	6	102	+0.5	0.1	62	89
011.20.560	670.8		479	55	46	6	109	+0.5	0.1	53	56
011.30.560	689	662	458	80	60	5	135	+0.5	0.1	52	100
012.30.560	688.8	662	458	80	60	6	112	+0.5	0.1	62	100
011.20.630	742.8		543	55	46	6	121	+0.5	0.1	53	64
011.30.630	772.8	732	528	80	60	6	126	+0.5	0.1	62	118
012.30.630	774.4	732	528	80	60	8	94	+0.5	0.1	83	118
011.20.710	820.8		623	55	46	6	134	+0.5	0.1	53	70
011.30.710	850.8	812	608	80	60	6	139	+0.5	0.1	62	131
012.30.710	854.4	812	608	80	60	8	104	+0.5	0.1	83	131
011.25.764	886.8		671	63	54	6	145	+0.5	0.1	63	100
011.20.800	930	894	704	70	50	6	154	-0.5	0		120
012.20.800	936	894	704	70	50	8	116	-0.5	0		120
011.25.800	942	904	692	78	58	6	156	-0.5	0		150
012.25.800	952	904	692	78	58	8	118	-0.5	0		154
011.40.800	966.4	922	678	100	80	8	118	+0.5	0.1	111	219
012.40.800	968	922	678	100	80	10	94	+0.5	0.1	140	219
011.25.900	1048	1004	792	78	58	8	130	-0.5	0		170
012.25.900	1060	1004	792	78	58	10	105	-0.5	0		176
011.40.900	1062.4	1022	778	100	80	8	130	+0.5	0.1	111	244
012.40.900	1068	1022	778	100	80	10	104	+0.5	0.1	140	244
011.25.980	1110.4		887	63	54	8	136	+0.5	0.1	83	130
011.25.1000	1152	1104	892	78	58	8	143	-0.5	0		191
012.25.1000	1160	1104	892	78	58	10	115	-0.5	0		194
011.35.1000	1160	1120	876	90	70	8	144	-0.5	0		238
012.35.1000	1170	1120	876	90	70	10	116	-0.5	0		244
011.40.1000	1188	1122	878	100	80	10	116	+0.5	0.1	140	294
012.40.1000	1185.6	1122	878	100	80	12	96	+0.5	0.1	167	284
011.25.1120	1278		1013	79	70	10	125	+0.5	0.1	135	191
011.35.1120	1300	1240	996	90	70	10	129	-0.5	0		286
012.35.1120	1308	1240	996	90	70	12	108	-0.5	0		289
011.40.1120	1298	1242	998	100	80	10	127	+0.5	0.1	140	318
012.40.1120	1305.6	1242	998	100	80	12	106	+0.5	0.1	167	318
011.30.1180	1338		1068	79	70	10	131	+0.5	0.1	129	238
011.25.1250	1408		1143	79	70	10	138	+0.5	0.1	135	232
011.35.1250	1430	1370	1126	90	70	10	142	-0.5	0		317
012.35.1250	1440	1370	1126	90	70	12	119	-0.5	0		324
011.40.1250	1450	1390	1108	102	80	10	144	-0.5	0		416
012.40.1250	1452	1390	1108	102	80	12	120	-0.5	0		412
011.45.1250	1449.6	1390	1110	110	90	12	118	+0.5	0.1	188	438
012.45.1250	1453.2	1390	1110	110	90	14	101	+0.5	0.1	219	438
011.30.1320	1497.6		1208	89	80	12	122	+0.5	0.1	176	313
011.35.1400	1584	1520	1276	90	70	12	131	-0.5	0		354
012.35.1400	1596	1520	1276	90	70	14	113	-0.5	0		364
011.40.1400	1608	1540	1258	102	80	12	133	-0.5	0		470
012.40.1400	1610	1540	1258	102	80	14	114	-0.5	0		465
011.40.1400	1593.6		1266	94	85	12	130	+0.5	0.1	187	424
011.45.1400	1605.6	1540	1260	110	90	12	131	+0.5	0.1	188	501
012.45.1400	1607.2	1540	1260	110	90	14	112	+0.5	0.1	219	501
011.30.1500	1677.6		1388	89	80	12	137	+0.5	0.1	176	355
011.40.1600	1803.2		1466	94	85	14	126	+0.5	0.1	218	503
011.40.1600	1812	1740	1458	102	80	12	150	-0.5	0		554
012.40.1600	1820	1740	1458	102	80	14	129	-0.5	0		561
011.45.1600	1817.2	1740	1460	110	90	14	127	+0.5	0.1	219	584
012.45.1600	1820.8	1740	1460	110	90	16	111	+0.5	0.1	250	584
011.50.1600	1824	1762	1434	124	100	12	151	-0.5	0		750
012.50.1600	1834	1762	1434	124	100	14	130	-0.5	0		763
011.40.1800	1999.2		1666	94	85	14	140	+0.5	0.1	218	558
011.40.1800	2016	1940	1658	102	80	14	143	-0.5	0		612
012.40.1800	2032	1940	1658	102	80	16	126	-0.5	0		637
011.45.1800	2013.2	1940	1660	110	90	14	141	+0.5	0.1	219	652
012.45.1800	2012.8	1940	1660	110	90	16	123	+0.5	0.1	250	639
011.50.1800	2044	1964	1634	124	100	14	145	-0.5	0		887
012.50.1800	2048	1964	1634	124	100	16	127	-0.5	0		885
011.50.1900	2139.2	2139.2	1729	109	100	14	150	+0.5	0.1	257	861
011.60.2000	2268.8	2178	1825	144	120	16	139	+0.5	0.1	333	1202
012.60.2000	2264.4	2178	1825	144	120	18	123	+0.5	0.1	375	1169
011.50.2130	2380.8	2380.8	1959	109	100	16	146	+0.5	0.1	294	978
011.60.2240	2492.8	2418	2065	144	120	16	153	+0.5	0.1	333	1294
012.60.2240	2498.4	2418	2065	144	120	18	136	+0.5	0.1	375	1294
011.50.2355	2604.8	2604.8	2184	109	100	16	160	+0.5	0.1	294	1075
011.60.2500	2768.4	2678	2325	144	120	18	151	+0.5	0.1	375	1509
012.60.2500	2776	2678	2325	144		20	136	+0.5	0.1	418	1509
011.50.2645	2892.8	2892.8	2474	109	100	16	178	+0.5	0.1	294	1199
011.60.2800	3074.4	2978	2625	144	120	18	168	+0.5	0.1	375	1696
012.60.2800	3076	2978	2625	144	120	20	151	+0.5	0.1	418	1696
011.75.3150	3476	3376	2922	174	150	20	171	+0.5	0.1	522	2873
012.75.3150	3471.6	3376	2922	174	150	22	155	+0.5	0.1	574	2873

During installation, precise alignment is critical. Misalignment can cause uneven load distribution, reduce rotation efficiency, and accelerate wear. Engineers must ensure that mounting surfaces are flat and clean. Bolts should be tightened according to recommended torque specifications to prevent loosening during operation. Additionally, FDON bearings include seals that must be checked for integrity before installation to protect against dust and moisture ingress.

Maintenance is equally important. Lubrication keeps rolling elements moving smoothly, reducing friction and wear. FDON recommends periodic inspection for signs of corrosion, cracks, or excessive play. Promptly addressing issues prevents downtime and ensures machinery safety. Moreover, regular bolt inspections maintain structural stability and rotational precision.

FDON bearings are engineered with high-quality steel, precision-machined raceways, and advanced heat treatment, which provide durability and load-handling capability. Combined with proper installation and routine maintenance, these bearings deliver reliable performance even under harsh working conditions. Operators can achieve smooth rotation, high efficiency, and long service life.

In conclusion, following FDON installation and maintenance practices maximizes bearing performance and extends operational longevity. Proper handling ensures that excavators, cranes, and other heavy machinery operate safely and efficiently. Choosing FDON guarantees quality, reliability, and support for critical engineering applications.

When To Choose This Structure — Slewing Bearing

Sheet 01 · Selection Guide

When Should I Choose This Structure?

Before you place an order, check whether a triple-row roller slewing bearing actually matches your equipment’s duty conditions — faster than reading any spec sheet.

Your equipment needs continuous 360° rotation under high torque, heavy-load conditions — e.g. cranes, excavators, tunnel boring machines, wind turbine yaw systems.
Installation space is limited, and axial load, radial load and tilting moment must be carried by a single bearing rather than a separate bearing-plus-gearbox assembly.
The equipment needs a built-in slewing drive gear (internal or external), eliminating extra transmission components and simplifying assembly.
The operating environment involves dust, moisture, or large temperature swings, requiring a bearing with built-in sealing and lubrication channels.
The project has clear requirements for rotational accuracy and adjustable clearance — e.g. medical equipment, solar tracking mounts, precision turntables.

One-line summary

If your equipment needs to “rotate and carry heavy loads at the same time,” a triple-row roller slewing bearing is usually the most direct, integrated solution.

Typical equipment

Tower crane slewing platforms, crawler crane turntables, excavator upper structures, TBM cutterhead drives, wind turbine yaw/pitch systems, stacker-reclaimer slewing bodies.

When NOT To Choose It — Slewing Bearing

Sheet 02 · When Not To Use

When Should I NOT Choose It?

We’d rather help you find the right solution than sell you the wrong one. Here’s when a slewing bearing may not be the best fit.

If your rotational speed requirement exceeds the typical design range for slewing bearings (e.g. high-speed rotating platforms), a cross roller bearing or dedicated high-speed structure is usually a better fit.
If overall weight is extremely sensitive for the machine (e.g. drone gimbals, small precision instruments), a thin-section or angular-contact bearing combination may be lighter and more suitable.
If budget and production volume favor a standard bearing plus external gear assembly, that may be more cost-effective for non-heavy-duty, non-harsh-environment applications.
If installation space is extremely constrained and cannot meet the minimum installation diameter, confirm with our engineers whether a compact custom design is available.

Not sure which case applies to you?

Send us your equipment’s duty conditions (load / speed / space / environment) and our engineers will tell you within 24 hours whether it fits — not just try to sell you something.

Free Duty Assessment →

Required Data For Selection — Slewing Bearing

Sheet 03 · Selection Data

Required Data For Selection

You don’t need a finished drawing to get started — tell us what you already know, and our engineers will help fill in the rest.

Category	Data Needed	Why It Matters
Load Parameters	Axial load, radial load, tilting moment	Determines the number of rows and raceway design
Envelope Dimensions	Installation OD / ID, installation height, bolt hole pattern	Determines whether a standard size fits or custom sizing is needed
Speed & Duty	Operating speed (rpm), continuous or intermittent duty, environment	Affects lubrication method and seal grade
Drive Type	Internal-tooth / external-tooth / no gear (bearing only)	Determines gear module, tooth count and precision grade
Precision	Rotational accuracy, clearance range (negative clearance required?)	Affects manufacturing process and inspection standard
Drawing / Reference Part	Existing drawing, old bearing model, or competitor part number	Allows a direct 1:1 match or replication — the fastest path to selection

No drawing on hand? That’s fine — send us the parameters you know, or a photo of your old bearing’s nameplate.

Send Data Now →

Materials, Hardness, Clearance & Gear — Slewing Bearing

Sheet 05 · Material & Process

Materials / Hardness / Clearance / Gear Treatment

Every batch ships with a material certificate, hardness test report and NDT report — third-party re-inspection is welcome.

01 · MATERIAL

Ring Material

42CrMo / 50Mn (specifiable)

Determines overall strength and fatigue life. Heavy-duty applications use alloy structural steel with quenching & tempering.

02 · HARDNESS

Raceway Hardness

HRC 55–62, depth customizable

Medium-frequency induction hardening gives more uniform hardness than through-hardening, avoiding soft spots.

03 · CLEARANCE

Clearance Grade

Standard or negative, P0–P6

Heavy-duty, low-speed equipment usually uses negative clearance for higher stiffness; precision equipment can go tighter.

04 · GEAR

Gear Treatment

Q&T or induction-hardened teeth

Frequent start/stop or heavy-duty drive applications benefit from hardened tooth flanks for longer life.

Related Applications — Slewing Bearing

Sheet 06 · Applications

Related Applications

Don’t see your industry? Applications go far beyond the examples below — tell us what your equipment does.

Cranes

Excavators & Construction

Wind Turbines

Solar Tracking

Port Machinery

Rotary Platforms

Real Project Case — Slewing Bearing

Sheet 07 · Project Reference

Real Project Case

More project photos, inspection reports and customer references are available on request — happy to sign an NDA if needed.

Custom triple-row roller slewing bearing manufactured for a stacker-reclaimer, Southeast Asia port project

Case File · Port Machinery

Stacker-Reclaimer Slewing Bearing — Custom Project, SE Asia

Background: The customer was using an imported triple-row roller slewing bearing with a 4-month lead time and a high price point.
Requirement: Find a faster-to-deliver alternative while keeping the original installation dimensions and load parameters unchanged.
Solution: Based on the customer’s original part drawing, we replicated the key dimensions and gear geometry 1:1, and raised raceway hardness to HRC 58–62.

45 DaysLead Time

1:1Dimensional Match

2ndRepeat Order

Slewing Bearing Model Finder

Model Finder

Slewing Bearing Model Finder

Filter 463 catalog specifications by dimension. Results update instantly — no page reload, no server round-trip.

Outer Diameter (mm)

—

Inner Diameter (mm)

—

Height (mm)

—

Geared Type

Module (mm)

Number Of Teeth

—

Matching 463 / 463 models

Model	Structure	Geared Type	OD (mm)	ID (mm)	Height	Module	Teeth	Weight (kg)

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Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

1. What types of slewing bearings does FDON GROUP provide?

FDON GROUP supplies a full range of slewing bearings to meet different industrial needs:

Single row four point contact slewing bearings Application: medium loads, precise rotation.
Double row ball bearings Application: higher radial and axial loads.
Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
Three row roller bearings – Application: extreme loads in heavy equipment.
Ball combine roller bearings –Application: precise rotational adjustment applications.
Customized bearings – tailored for specific equipment requirements.

2. How do I choose the right bearing for my application?

Typical selection parameter for FDON clients:

Load type: axial, radial, and tilting moment.

Rotation RPM: ensures long service life.

Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.

Precision & rigidity requirements: critical for cranes, excavators, and robots.

FDON engineers provide professional selection guidance according to your equipment and drawings.

3. What materials does FDON GROUP use for slewing bearings?

FDON GROUP selects materials for strength, wear resistance, and long-term durability:

Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.

Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).

Corrosion resistant: SS 304, 316L, duplex stainless steel.

Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)

4. How can FDON GROUP achieve maximum service life?

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

5. What causes abnormal noise or vibration in bearings?

Typical factors observed by FDON engineers:

Insufficient or incorrect lubrication.
(dust, metal particles) in raceways.
Rolling element or track damage.
Uneven mounting surfaces or misalignment.
Incorrect bolt torque(below grade 8.8) or preloading.

6. What are lead times and lifetime guarantee?

In-stock: 3–7 days.

Custom: 2–6 weeks depending on size, load, and precision.

Warranty: 1 year

Lifetime Free Spare Parts: Glue, seals, steel ball

7. Does FDON provide installation and technical support?

Yes — FDON GROUP offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

8. How do FDON Group differ from competitors?

Full range of materials and heat treatments for various load conditions.

High precision and strict quality inspection standards.

Engineering support before and after delivery.

Customization to exact equipment requirements.

Proven performance in cranes, excavators, robotics, wind turbines, and heavy machinery etc.

FDON MANUFACTURING CO., LTD

Leading Slew Drive & Slewing Bearing Manufacturer in China.

FDON products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.