Product Details

Specification

ZZ Slewing Drive offers a wide range of drive systems to cover a wide range of application requirements, and all models of IMO WD-H Series Slewing Drive are interchangeable. Both have similar construction and performance characteristics.

High torque output: Both ZZ and IMO WD-H series offer high torque output for rotary applications requiring high torque.
Compact design: Both feature an integrated design that simplifies system installation and maintenance.
High reliability and durability: Both drive units feature dustproof, waterproof and other enclosed designs for use in harsh environments.

Part Number	Series	Number of drives	Drive style	Module	Number Of Threads Of The Worm	Self Locking Gears	Weight	Slew Drive Gear Ratio	Max Torque	Nom Torques	Max Holding Torque
WD-H 0220 / 1 drive	WD-H Series	1 drive	Worm	5	2	No**	89 Kg	28	11093 Nm	5150 Nm	11093
WD-H 0300 / 1 drive	WD-H Series	1 drive	Worm	6	2	No**	167 Kg	30.5	22360 Nm	14000 Nm	22360
WD-H 0300 / 2 drive	WD-H Series	2 drive	Worm	6	2	No**	186 Kg	30.5	44720 Nm	28000 Nm	44720
WD-H 0373 / 1 drive	WD-H Series	1 drive	Worm	8	1	No**	285 Kg	56	47416 Nm	35500 Nm	47416
WD-H 0373 / 2 drive	WD-H Series	2 drive	Worm	8	1	No**	330 Kg	56	94832 Nm	71000 Nm	94832
WD-H 0490 / 1 drive	WD-H Series	1 drive	Worm	8	1	No**	347 Kg	70	59799 Nm	59799 Nm	59799
WD-H 0490 / 2 drive	WD-H Series	2 drive	Worm	8	1	No**	394 Kg	70	119598 Nm	119598 Nm	119598
WD-H 0645 / 1 drive	WD-H Series	1 drive	Worm	8	1	No**	430 Kg	90	76310 Nm	76310 Nm	76310
WD-H 0645 / 2 drive	WD-H Series	2 drive	Worm	8	1	No**	516 Kg	90	152610 Nm	152610 Nm	152610

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

1. What types of slewing bearings does ZZ Slewing Bearing provide?

ZZ Slewing Bearing 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 ZZ 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.

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

3. What materials does ZZ Slewing Bearing use for slewing bearings?

ZZ Slewing Bearing 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 ZZ Slewing Bearing 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 ZZ 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 ZZ provide installation and technical support?

Yes — ZZ Slewing Bearing offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

8. How do ZZ Slewing Bearing 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.

ZZ Slewing Bearing (Shanghai) Co., Ltd

Leading Slew Drive & Slewing Bearing Manufacturer in China.

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