EWA17-2 Series Slewing Drive

Dual-worm slewing drive is usually installed horizontally, and mainly used in engineering machinery. As the worm gear is driven by two worm, it can output larger driving moment, more reliable self-locking performance and better safety performance in restricted space.And it is usually applied in occasions of low speed but larger moment, such as flat-form tire trolley and overhead traveling crane.


Dual-worm slewing drive is usually installed horizontally and is mainly used in engineering machinery. As two worms drive the worm gear, it can output more significant driving moments, more reliable self-locking performance, and better safety performance in restricted space. And it is usually applied on occasions of low speed but at a more significant moment, such as flat-form tire trolleys and overhead traveling cranes.


1. For situations where high torque is required, we introduce and recommend dual worm slewing drives which equip with a worm wheel and have high scuffing resistance.

2. Driven by two worms, its output torque and performance are higher than that of a single worm slew drive

3. Through excellent heat treatment, hardness of its is high

4. In the typical case, our worm reducer is connected to a hydraulic motor by a universal input hole.


1. Girder transporter

2. Timber grab machine

3. Gantry crane

4. lifting equipment

5. automotive engine assembly flip and positioning stand

Performance Parameters

Front View Top View


Output torque Tilting moment torque Holding torque Axial load Radial load Ratio Backlash Weight
输出转矩 倾覆力矩 保持力矩 轴向承载力 径向承载力 速比 精度 重量
19.44 kN.m 142.4 kN.m 110 kN.m 1166 KN 435 KN 104:1 <= 0.15 ° 115Kg
14347 Lbf.ft 105000 Lbf.ft 81200 Lbf.ft 262000 Lbf 97800 Lbf

Characteristics of Dual Worm Slewing Drive

Dual-worm slewing drive is a brand new slewing drive product, which consists of an outer casing, worm gear ring, worm, motor, and other components. Compared with the single worm slewing drive, the dual-worm slewing drive still has the characteristics of modularization, safety, and simplified host design. The load capacity is better, and the output torque far exceeds that of a single worm rotary drive. The dual-worm slewing drive abandons the core component slewing bearing in design and forms a double-row space cross-roller slewing bearing in theory through the outer casing and the worm gear. Rotation to ensure that while achieving higher bearing capacity, it can also generate enormous output torque.

Application Fields of Dual Worm Slewing Drive

1. Compared with the single worm slewing drive, the double worm slewing drive is more suitable for the steering device of the heavy-duty flatbed transporter. The practice has proved that when the single worm slewing drive is used for heavy equipment with a more significant cargo, it will produce jitter, noise, casing distortion, and even worm breakage. Therefore, this particular rotary drive has become a supporting product favored by most heavy equipment designers.

2. Heavy lifting and aerial work

Double worm slewing drive caters to the needs of the majority of users. It has extreme adaptability to harsh working conditions and uses conditions, especially in heavy lifting and heavy-duty aerial work. The double worm slewing drive is used together with the traditional slewing bearing, which makes the slewing mechanism even more powerful. While obtaining a more significant reduction ratio, it also provides an output torque several times higher than the traditional design. In the application field with extremely high demands on load and torque, the advantages of single worm slewing drive are gradually lost.

3. Heavy gantry lifting equipment

Most traditional gantry cranes are rail-moving types, which can only move linearly and parallelly on limited rails. Currently, some companies that pay more attention to technological innovation have gradually realized that breaking the traditional design concept of gantry lifting equipment is imperative. The double worm slewing drive is selected as the gantry hoisting equipment for the steering system. Compared with the previous design, the required hoisting equipment per unit operating area is reduced by 75%. While reducing operating and maintenance costs, The work efficiency has also been greatly improved.

4. Rotary table and mixing machinery field

Taking the concrete mixing machine as an example, while realizing the rotary mixing, the steering equipment is often required to provide more significant output torque. The double worm slewing drive is selected, simplifying the main engine's design and the slewing mechanism while achieving a more considerable output torque. The high assembly accuracy of the double worm rotary drive (mainly the backlash of the worm gear pair) is also one of the reasons why many users use the product for the worktable steering gear of large-scale high-precision equipment.

Why Choose Our Slewing Drives?

We offer different dimensions and construction series with straight or helical gearing, an open or closed structure, and screws and casing. We use other materials when manufacturing based on the customer's requirements and operational conditions.

Technical features
Raceway diameter 222 mm up to 640 mm (9 in up to 25 in)
Max. output torque Up to 43,000 Nm (31,585 Ibf-ft)
Weight Up to 250 kg (551 Ibs)
Lubrication Grease
Temperature range -20°C up to +40°C
Design Enclosed housing, ball bearing
Slewing range 360°

Our slewing drives are available in a large variety of standard design sizes. We will gladly develop a slew drive tailored to your requirements if you are looking for an individual solution.

Contact us – we will be happy to help you!


1. Where is your slew drive manufactured?

A: Our slew drives are all manufactured in China. We can design and produce slew drives, and the quality can also be guaranteed. At the same time, our slew drives price is more favorable.

2. I don't know which slew drive to use. Can you choose for me?

A: Yes, we have two product series of worm gear slew drives and spur gear slew drives. Each model has a parameter list on the website. You can choose the suitable slew drive according to these parameter lists. If you don't know how to choose, you can contact our engineers, and we will work with you to select a suitable product. We can also design a new slew drive solution for you according to your equipment.
3. Can I get your product catalog?

A: You can get our product catalog in the download or contact us. We will send the product catalog to you by email or other ways.

4. Can you customize products?

A: Yes, we can. Our engineers have an emotional experience in slew drive design. On the customized slew drives page, you can see some unique customized products designed by our engineers. These design solutions meet the particular needs of many customers. Our engineers can also work with you to design a new slew drive.

5: Can you provide accessories?

A: Yes, we can provide matching spare parts such as motors, hydraulic motors, and encoders compatible with slew drives.

6. Can you provide a 3D model?

A: Yes. All our slew drives have 3D models. You can contact us to get them. At the same time, we can also provide CAD files and PDF files.
7. How long is your slew drives warranty period?
A: Our slew drives warranty time is 12 months. When you install, use and store the slew drives, please refer to the slew drives instruction manual.
8. Can you choose the color of your slew drives housing?

A: Yes. Our slew drives housing is available in many colors. If you have special requirements, please tell our sales engineers, we are happy to provide services for you.

Additional information



Product Quick Detail:

  • Standard and non-standard available
  • With high quality and competitive price
  • Prompt delivery
  • Packing as per customer’s demand.

We promise will offer the best price by the high quality in china! We also accept special order about the products. If you are interested in our products. Please do not hesitate to let us know.We are pleased to give you the detailed information.We promise that our products would be safety and were in high quality and reasonable price. If you are interested in our products, please contact us asap.We are sincerely looking for your cooperation.

Most of our products are exported to Europe or Americas, both standard and nonstandard products available. We can produce as per your drawing or sample. Material can be standard or as per your special request. If you choose us, you choose reliable.

pruduct quality report

Materials Available

1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request
product materials available

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly
product finishing

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port
product packages