Single Row Cross Roller Slewing Bearing - 797 Series

Single Row Cross Roller Slewing Bearing - 797 Series - Heavy Load Engineering Solution

The Single Row Cross Roller Slewing Bearing - 797 Series represents a proven engineering solution for heavy-duty rotational applications requiring exceptional load capacity and structural rigidity. Manufactured from 42CrMo integral forged steel with comprehensive quenching treatment, this external gear slewing ring delivers axial load capacity, radial load capacity, and high tilting moment resistance in a compact design. The 797 Series includes models such as 1797/3230, 2797/1010G2, and 797/1600G, engineered specifically for bucket wheel stacker reclaimer slewing bearings, marine crane slewing bearings, and port crane rotary bearing systems. With precision external gear machining and multi-layer sealing systems, these heavy load cross roller slewing rings provide direct 1:1 replacement compatibility with mainstream international brands.

Technical Structure and Operating Principle

The products employs a single raceway design where cylindrical rollers are positioned perpendicular to each other at 90-degree intervals. This crossed arrangement allows alternating rollers to handle axial and radial forces simultaneously, providing 3-4 times higher rigidity compared to ball-type slewing bearings. The outer gear turntable bearing configuration positions teeth on the external circumference, enabling direct drive from pinion gears while maintaining a compact footprint.

The 42CrMo integral forging construction undergoes overall quenching heat treatment, achieving raceway hardness of HRC 58-64. This process ensures high wear resistance, anti-fatigue properties, and extended service life under continuous heavy load conditions. The precision external gear machining guarantees smooth meshing with drive pinions, reducing clearance and improving positioning accuracy critical for heavy crane slew ring and steel plant turntable bearing applications.

The multi-layer heavy-duty sealing system incorporates dust-proof, waterproof, and corrosion-resistant barriers, making this no inner gear slew bearing suitable for harsh outdoor environments, including offshore crane slew rings and bulk material stacker slewing rings exposed to saltwater, dust, and chemical contaminants.

Specifications

This designation method follows the previous China national bearing standard.It consists of prefix code.basic code and suffix code.
1.Prefix Code
The precision grade of slewing bearing has three grades:Grade G,Grade E, Grade D,Grade G is generally the standard specification and not normally shown.
2.Basic Code
The basic code consists of 7 numbers,the explanation for these numbers are referred to in the table below
d Inner diameterd(mm)	Designation method		Example
			Bearing type	（mm） Inner diareter(mm)
<500	1. Expressed by the quotient of dividing inner diameter by 5. 2. When the inner diameter is decimal or could not be divided exactly by 5,it will be expressed by a fraction,and the denominator directly indicates the dimension of inner diameter		79764
			797/496	496
			797/488.5	485
≥500	Expressed by fraction,and the denominator directly indicates the dimension of inner diameter		797/800	800
3. Suffix Code: Common suffix codes used in slewing bearing designations are shown in the table below
Code		Definition
G,G2,...		In which:G indicates the material of bearing ring is 5CrMnMo: G2 indicates the material of bearing rings is 50Mn:the material of bearing ring is 42CrMo, when there is no code.
K,K1,K2...		Bearing structure differs from the standard structure.
M		Requirement for friction moment
Y,Y1,Y2...		Changes in bearing technique

Performance Specifications

Engineering Advantages for Heavy Industrial Applications

Superior Load Distribution

The crossed roller configuration maximizes contact surface area, distributing heavy loads evenly across the raceway. This high load slewing ring design prevents stress concentration, reducing the risk of raceway spalling common in tower crane slewing bearings and mobile crane turntable rings under shock loading.

Enhanced Structural Rigidity

Rollers at 90-degree crossing angles provide the big moment turntable bearing excellent tilting moment resistance. This stiffness is essential for deck crane cross roller bearings handling off-center loads during ship cargo operations and rotary kiln slew bearings controlling thermal expansion pressures.

Precise Gear Engagement

The precision-machined external gear ensures consistent mesh quality with drive pinions, minimizing vibration and noise. This feature is essential for high precision slewing rings in automated stacker reclaimer turntable rings and mining excavator slewing bearings where positioning accuracy directly impacts operational efficiency.

All-Weather Durability

The comprehensive sealing system blocks contaminants while retaining lubrication, crucial for marine slewing bearings for ship cranes and port stacker slew bearings exposed to saltwater spray, dust, and temperature extremes. Special surface treatments are available for enhanced corrosion resistance in offshore crane applications.

Industrial Application Fields

Port and Bulk Material Handling

The 1797/3230 model serves as the primary rotational support for bucket wheel stacker reclaimers in bulk material terminals. The heavy load rotary bearing handles continuous slewing motions while supporting bucket wheel weights exceeding 200 tons. The heavy industrial rotary table bearing design accommodates the constant direction changes required in stacking and reclaiming operations.

Marine and Offshore Equipment

Ship deck crane turntable rings and offshore crane slew rings operating in marine environments demand corrosion resistance and reliability under rolling vessel conditions. The Single Row Cross Roller Slewing Bearing - 797 Series provides stable rotation for marine crane slewing bearings while withstanding saltwater exposure and dynamic loading from wave-induced vessel motion.

Heavy Lifting Excavator

Tower crane slewing bearings, mobile crane turntable rings, and heavy crane slew rings rely on the 797 Series for safe load rotation. The heavy duty slewing bearing construction ensures structural integrity when lifting maximum-rated loads at full boom extension, where tilting moments reach peak values.

Metallurgical and Mining Operations

Steel plant turntable bearings for ladle turrets require heat resistance and reliability in high-temperature environments. The ladle turret slewing ring configuration allows safe molten metal handling. Mining excavator slewing bearings and tunneling machine turntable rings benefit from the robust construction that withstands abrasive dust and shock loads during rock excavation.

Quality Control and Customization

Every unit undergoes 100% dimensional inspection using coordinate measuring machines, raceway hardness testing, and rotation flexibility verification before shipment. Luoyang Heng Guan Bearing Technology maintains ISO 9001 certification and RoHS compliance, ensuring consistent quality across production batches.

Custom Engineering Services

You can specify precision grades (P0/P6/P5/P4), special sealing configurations, or unique surface treatments to match your application requirements. For equipment lacking original drawings, our on-site measurement and reverse engineering service captures critical dimensions, analyzes wear patterns, and produces optimized replacement designs. The In Stock product ships within 7-15 days from stock. Custom setups take 4-6 weeks, depending on intricacy.

Compatibility Verification

Technical drawing reviews ensure 1:1 dimensional match with existing mounting interfaces. Semi-finished bearing inventory enables rapid response for urgent replacement needs, minimizing equipment downtime.

Certification

FAQ

Q: Can the 797 Series replace imported slewing bearings?

A: Yes, these bearings are manufactured to international standards with 1:1 dimensional compatibility. Technical drawing verification ensures proper fit.

Q: What makes cross roller design better for heavy loads?

A: The perpendicular roller arrangement handles axial and radial forces simultaneously with higher rigidity than ball bearings, reducing deflection under moment loads.

Q: Are custom sizes available?

A: Yes, we manufacture slewing bearings from 50-10000mm diameter with customized gear modules, seal types, and precision grades based on your specifications.

Q: How does sealing perform in marine environments?

A: The multi-layer seal system blocks saltwater and contaminants. Optional corrosion-resistant coatings provide additional protection for offshore applications.

Contact Us

For technical selection assistance, dimensional drawings, or customized Single Row Cross Roller Slewing Bearing - 797 Series solutions, contact our engineering team at mia@hgb-bearing.com. Please provide your application details and existing bearing specifications to receive accurate recommendations and delivery schedules.