Slewing drives usually consist of an inner ring and an outer ring separated by balls with either a helical or proper worm gear in the outer ring. This is mounted on a standard housing that contains a worm shaft and shaft support bearings.

Grease fittings allow re-lubrication to the bearing raceway, the worm gear, and the supporting worm shaft bearings. The rings may incorporate tapped or clearance holes for bolts. Spacers usually separate the rolling elements, and the raceways are hardened and ground. Nitrile rubber strip seals retain lubricant in the bearing and prevent the ingress of contaminants.

As illustrated below, slewing drives are generally supplied with motors in a right-hand configuration.

Part Description Part Description
1 Enclosed housing 9 End cap O-rings
2 Large O-ring 10 Outer oil seals
3 Slewing ring 11 Taper roller bearing
4 Top plate seal 12 Inner oil seals
5 Upper positioning bolts 13 Worm shaft
6 Top plate 14 Grease nipples
7 Non-drive end cover 15 Lower positioning bolts
8 End cap & bolts 16 Drive end adaptor cap

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
600 kN.m 1800 kN.m 5200 kN.m 76 KN 23 KN 62:1 <= 0.20 ° 16Kg
443 Lbf.ft 1328 Lbf.ft 3837 Lbf.ft 17084 Lbf 5170 Lbf

What Problems Should Be Considered in the Selection of Slew Drive?

A slew drive is essentially a rotating supporting device, but it has more advantages than slewing bearings; increasingly, traditional industries are now beginning to use slewing drives to replace slewing rings.

The slewing accuracy and other conditions that the slew drive can provide also enable some mechanical technologies that require precise control to be realized. Choosing a suitable slewing drive is essential for the regular and smooth operation of mechanical equipment.

When designing the slew drive, many problems should be considered, such as axial load, radial load, tilting moment torque, positioning accuracy, gear ratio, etc. So what problems should be considered when selecting a suitable slew drive?

(1) Equipment performance requirements:

We always talk about cost performance when we buy things. The same goes for slew drives. Under the condition of meeting the performance requirements of the equipment, choosing a smaller slew drive can save cost. For example, the equipment must reach a particular load, achieve higher accuracy, and bear greater tilting moment torque. According to different requirements, select the slewing drive that meets the requirements.

(2) Installation form:

Slew drive has various shapes, which can be installed horizontally and vertically. Therefore, the style of slew drive should be selected according to the installation space conditions of the mechanical equipment.

(3) Operating conditions:

Consider what environmental conditions the mechanical equipment being used. The slew drive has open and closed types that meet different working conditions. The enclosed slew drive is protected by housing and has a higher protection degree. It can be used in harsh environments such as dust, humidity, and sand. Open slew drive has a better advantage to the price and can be used in typical environments.

(4) Rotation direction required by mechanical equipment:

The primary function of slewing drive is rotation. If there is only 1 azimuth rotation, you can select a single-axis slew drive, then choose horizontal or vertical installation to meet a single azimuth rotation. Still, if the mechanical equipment needs to rotate in different directions, you can select a dual-axis slew drive to complete the horizontal and vertical process.

(5) Rotation accuracy required by mechanical equipment:

The slewing drive provided by HZPT has ordinary and precision products. If the mechanical equipment has high requirements for rotation accuracy, you can choose the precision slew drive. If the mechanical equipment has no requirements on rotation accuracy, you can choose the ordinary accuracy slew drive.

(6) Power source of mechanical equipment:

When choosing a suitable slewing drive, it is also necessary to consider that the power source has sufficient power. If the equipment equipped with a smaller motor and a larger slew drive is selected, then it is very likely that the motor will not move the slewing drive, causing the slew drive to fail to rotate. Therefore, it is also essential to consider the power source of mechanical equipment when choosing a slew drive.

The slewing drive selection is basically to consider these issues, which may be a complicated process for you. You don’t need to solve these problems by yourself. Contact us, and our engineers will help you choose a suitable and economic slew drive.

Typical Case of Slewing Drive

The list of active applications for slew drives is extensive. Several industries require some form of slew drive to make their operations more efficient. Equipment for mining, construction, metalworking, and other applications that require unrelenting strength combined with faultless precision use slewing technology for safety and accuracy. Powerful devices like aerial lifts, rotating forklifts, truck-mounted cranes, cable winders, fire trucks, hydraulic machinery, and utility equipment depend on the safety and strength of slew drives.

Attachment tools

Steering gearboxes

Boom arms

Custom Slewing Drives

HZPT provides its customers with a high-quality application-based slew drives product line. Sizes range from 7.5″ (200mm) up to 20″ (500mm) in ID. Standard hydraulic or electric motors rotate the drive-through standard worm shaft inputs and can be assembled upon customer request, depending on their application.

Our engineers are well equipped with the tools and technology necessary to work alongside our customers. We work to understand their applications, design requirements, project scope, and loads and help identify the most suitable products. We are ready to provide technical support and slew drive recommendations based on application requirements.

For over 3 decades, slewing rings and slew drives have proven their worth in the most varied application areas. We’ve been supplying products to many of our customers for decades. We’d love to have the opportunity to win you over with our technological competence, too!


1. What is the producing process?

A: Production process including raw material cutting, machine processing, grinding, accessories cleaning, assemble, cleaning, stoving, oil coating, cover pressing, testing, and package.

2. How to control the product’s quality?

A: Combining advanced equipment and strict management, we provide a high standard and quality slewing drive for our customers worldwide.

3: How long is your delivery time?

A: If there is stock, it is within 7 days; if there is no stock, it is 25-45 days, depending on the quantity.

4. Are you a trading company or a manufacturer?

A: We have our factory with 20 years of experience in slewing drive; our type is factory + trade.

5: What are your terms of payment?

A: Stocks goods,100% prepaid. If goods need to produce,30% prepaid and the balance paid before shipment. For big orders over 50000 USD, we can accept L/C At sight.

6. What is your MOQ?

A: For standard type, no MOQ. To produce goods, we need according to slewing drive type.

7. What is transportation?
A: Small quantity, by express, such as DHL, UPS, TNT FEDEX. If large quantity, by sea or air.

8. Can you provide OEM service?
A: Yes, we provide OEM service, do as your size, packing, and other requirements.

Additional information