013.75.3550 Slewing Bearing

Model Specifications: JB/T 2300-2011 Standard — 01 Series (Single Row Four-Point Contact Ball Type) · Internal Gear Type · Steel Ball Diameter 75mm · Raceway Center Diameter 3550mm · Outer Diameter 3776mm

Product Description

013.75.3550 Slewing Bearing – Internal Gear Turntable Bearing for Excavators & TBMs

Luoyang Heng Guan Bearing Technology Co.,Ltd., located in China's bearing industry hub, specializes in high-precision Slewing Bearings with over 30 years of expertise. Our 013.75.3550 Slewing Bearing is a Series 01 internal gear type—featuring m=20, Z=162 teeth machined inside the inner ring bore, where drive pinions mesh internally. This internal gear slewing ring bearing minimizes upper-structure swing radius, ideal for compact heavy equipment. Manufactured from 50Mn forged rings with induction-hardened gear faces (55–62 HRC), it delivers 26,900 kN static axial capacity. The 013.75.3550 turntable bearing measures 3776mm OD × 3322mm ID × 174mm H, weighing approximately 3200kg. ISO9001-certified and RoHS-compliant, we export to 50+ countries.

Technical Specifications

Basic Dimensions

Parameter	Symbol	Value
Outer Diameter	Da	3776 mm
Inner Diameter	Di	3322 mm
Height	H	174 mm
Raceway Center Diameter	DL	3550 mm
Ball Diameter	Dw	75 mm
Weight	—	≈ 3200 kg

Mounting Dimensions

Parameter	Symbol	Value
Outer Bolt Circle	D₁	3686 mm
Inner Bolt Circle	D₂	3414 mm
Number of Outer Holes	n	56
Number of Inner Holes	n₁	45
Bolt Size	—	M42

Internal Gear Data

Parameter	Symbol	Value
Module	m	20
Number of Teeth	Z	162
Tip Circle Diameter	da	3220 mm (with x=+0.5 shift)
Profile Shift Coefficient	x	+0.5
Pressure Angle	α	20°
Gear Surface Hardness	—	55–62 HRC, Induction Hardened
Hardened Layer Depth	—	≥ 3.5 mm
Gear Accuracy	—	DIN Grade 8 / AGMA Equivalent
Recommended Clearance	—	0.4–0.6 mm

Critical Note: The internal gear tip circle (da=3220mm) sits inside the outer ring inner diameter (3322mm). Your drive pinion enters from the center bore to mesh—this is the fundamental geometric difference from external gear bearings.

Load Capacity

Parameter	Symbol	Value
Static Axial Load	C₀ₐ	26,900 kN
Static Radial Load	C₀ᵣ	19,500 kN
Tilting Moment	Mₜ	18,200 kN·m
Max Rotational Speed	nₘₐₓ	25 rpm

Applications

Hydraulic Excavators (40–80 Ton Class)

The internal gear turntable bearing for sale is the standard for excavator lower-frame swing systems. The pinion operates inside the bearing, isolated from track frames and mud ingress.

Tunnel Boring Machines (TBM)

In segment erector arms, the TBM slewing bearing supplier solution enables rotation in confined tunnel spaces, where internal drive protects mesh surfaces from rock dust and moisture.

Compact Crawler Cranes

When upper-structure swing space is limited, internal gears reduce swing radius compared to external gear alternatives.

Rotary Drilling Rigs

For power-head rotating platforms, internal meshing shields gear teeth from abrasive drilling debris.

Aerial Work Platforms

Telescopic boom turrets require maximum outboard space for work arms—internal gears surrender no external envelope to gearing.

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Why Choose Internal Gear?

1. Space Efficiency

Your pinion sits inside the 013.75.3550 Slewing Bearing. Lower assembly outer dimensions stay minimal—critical for tracked undercarriages.

2. Gear Protection

The mesh zone stays inside the bearing, shielded from external stones, mud, and dust contamination that plague external gear types.

3. Installation Flexibility

Upper structure swing radius is not constrained by protruding gears—you gain layout freedom.

4. Application Match

If you operate excavators, TBMs, or drilling rigs (not cranes or port equipment), the four point contact slewing ring with internal gear is your optimal choice. Cranes favor external gears; excavators demand internal.

Series Comparison

Feature	010.75.3550	011.75.3550	013.75.3550
Gear Type	Non-Gear	External Gear	Internal Gear
Gear Position	—	On outer ring	On inner ring bore
Module	Custom	m=20	m=20
Tip Circle	—	da=3880 mm	da=3220 mm
Teeth	—	Z=191	Z=162
Pinion Location	—	Outside bearing	Inside bearing
Swing Radius	N/A	Larger	Smallest
Best For	Positioners	Cranes, ports	Excavators, TBMs, drills

OEM & Custom Manufacturing

Heng Guan Bearing offers comprehensive services for the custom internal gear slewing bearing market:

· On-Site Measurement: Our engineers travel to your site with precision instruments to reverse-engineer worn bearings—no original drawings needed.

· Non-Standard Design: Tailor module, tooth count, hardness, or bolt patterns to your unique load profiles.

· CAD Support: We provide verified CAD models for your integration checks before production.

· Fast Prototyping: CNC vertical lathes, gear shapers, and quenching machines enable rapid iteration.

We serve OEMs in mining, tunneling, and heavy construction across Europe, North America, and Southeast Asia.

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Replacement & Cross Reference

To verify the 013.75.3550 slewing ring for your retrofit project, confirm these five dimensions:

1. D₁ (Outer Bolt Circle): 3686 mm

2. D₂ (Inner Bolt Circle): 3414 mm

3. H (Height): 174 mm

4. m (Module): 20

5. Z (Teeth): 162

Additional Check for Internal Gears: Measure clearance between the gear tip circle (da=3220.8mm) and the outer ring inner diameter (3322mm). Insufficient clearance indicates dimensional mismatch.

FAQ

Q: Can I replace an external gear bearing with this internal gear model?

A: No. The drive pinion locations differ entirely. External gears require outside access; internal gears need center-bore access. Verify your gearbox layout first.

Q: What is the lead time for a custom 013.75.3550 variant?

A: Standard specification ships in 4–6 weeks. Custom tooth modifications add 2–3 weeks for tooling.

Q: How do I select the correct pinion for Z=162 teeth?

A: Contact our engineers. Pinion design depends on your motor torque, reduction ratio, and mounting constraints. We provide full meshing calculations.

Q: Is the bearing sealed against water ingress?

A: Yes. Triple labyrinth seals with grease retention channels. Optional nitrile or fluoroelastomer lip seals for extreme environments.

Contact Us

Ready to specify your 013.75.3550 Slewing Bearing? Our engineering team provides load calculations, CAD integration, and quotations within 24 hours.

Email: mia@hgb-bearing.com

WHAT OUR CUSTOMERS SAY

Here is the customer's evaluation of us

From Europe

As a leading construction machinery manufacturer in Europe, we are very impressed with the quality and performance of your slewing rings. The precision machining and consistent quality meet our strict standards. A reliable global supplier!

From United States

Our CT scanners require extremely smooth rotation, low noise, and no magnetic interference. Your product perfectly meets these requirements, operating virtually silently without compromising image quality. Your technical expertise is truly impressive!

From Southeast Asia

We have been the distributor of your brand for many years and have received excellent customer feedback. Your diverse product line meets diverse customer needs, and our consistent quality makes us very competitive in the market. Your technical support and service team are also fantastic!

From United States

The slewing bearing selected for our wind turbine main drive system has exceeded our expectations in terms of precision and reliability. It operates smoothly even in extreme wind conditions and has a long maintenance cycle, significantly reducing our lifecycle costs. We are a trustworthy partner!

From the Middle East

Our equipment required a slewing bearing with non-standard dimensions and special gears. We contacted several companies but they all said they couldn't make it. Not only did you accept the order, but we also communicated smoothly throughout the entire process from proofing to mass production, and the finished product fully met our design requirements. This customization capability demonstrates your true technical strength.

From Europe

We have integrated your slewing rings into our new line of crawler cranes. The performance under full load and in extreme weather conditions has been flawless. The precision and durability meet the highest European standards. A truly reliable component for critical applications.

From North America

The harsh, sandy environment of our port is a true test for any equipment. Your slewing bearings' superior sealing system has effectively kept out abrasive contaminants. Our ship-to-shore cranes have seen a dramatic increase in uptime and service life since switching to your brand.

From the Middle East

In the mining industry, equipment failure is not an option. The immense strength and robust construction of your large-diameter slewing bearings have withstood the incredible shocks and loads in our mining excavators. Their reliability is directly contributing to our productivity.