Swing Gearbox Fit for Excavator Sumitomo SH120 A3
Swing Gearbox Fit for Excavator Sumitomo SH120 A3
The Swing Gearbox, also known as the swing drive or swing motor, is an essential component of an excavator. It is responsible for the rotational movement of the excavator's cabin and upper structure, allowing the operator to dig in multiple directions. Here are some specific functions and uses of the Swing Gearbox:
- Provides smooth, precise rotation of the excavator's upper structure.
- Allows the excavator to dig in multiple directions without having to reposition the machine.
- Helps distribute the weight of the excavator evenly, reducing the risk of tipping over.
- Protects other components of the excavator, such as the hydraulic system, from excessive strain.

Where is the Swing Gearbox Installed in an Excavator?
The Swing Gearbox is typically located at the base of the excavator's upper structure, near the base of the cabin. It is attached to the excavator's hydraulic system, which provides the power to rotate the gearbox and thus the upper structure. The Swing Gearbox works by transmitting power from the hydraulic system to a series of gears that ultimately rotate the upper structure.

Compatibility with Excavator Sumitomo SH120 A3
Our Swing Gearbox is designed to perfectly fit Excavator Sumitomo SH120 A3. Before purchasing, customers should ensure the following parameters:
| Parameter | Description |
|---|---|
| Model Number | SH120 A3 |
| Swing Ratio | 3.0 or 3.2 or 3.5 |
| Motor Type | Travel or Swing |
| Hydraulic Schematic | Open or Closed |
When to Replace the Swing Gearbox?
If your excavator is exhibiting any of the following symptoms, it may be time to replace the Swing Gearbox:
- Unusual noises coming from the gearbox, such as grinding or whining sounds.
- Difficulty rotating the upper structure, or jerky movements when rotating.
- Noticeable leaks of hydraulic fluid from the gearbox.
- Abnormal vibrations felt in the cabin while the excavator is in operation.
How to Maintain the Swing Gearbox?
Proper maintenance can help prolong the life of your Swing Gearbox. Here are some tips:
- Regularly check the gearbox for leaks and address any issues immediately.
- Keep the gearbox clean and free of debris.
- Check and adjust the gearbox's lubrication levels as needed.
- Follow the manufacturer's guidelines for maintenance and replacement.
Compatible Brands and Models
Our Swing Gearbox is compatible with a wide range of excavator brands and models, including:
- Caterpillar
- Komatsu
- Hitachi
- Volvo
- Hyundai
Please note that we do not sell products for the above-mentioned brands and models, and the compatibility list is provided for customers' convenience only.
About Our Company
We are a company specializing in the production of high-quality spare parts for excavators, bulldozers, and other construction machinery. Our products include walking reducer assemblies, rotary reducer assemblies, gears, gear rings, transmission shafts, planetary frames, wheel hubs, pump shells, rotary shaft seats, end caps, gaskets, bearings, and oil seals. Our products are suitable for more than 680 models and we currently produce over 12,000 kinds of transmission parts for excavators and bulldozers. We have a highly skilled production and design team, as well as a professional marketing team.
Author: Miya
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.

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
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
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


