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Help CenterQY4S315 Crane Reducer 4-Stage Cylindrical Gearbox for Heavy Duty Crane Running Mechanism
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Jiangsu Manqi Machinery Co., Ltd., a professional manufacturer based in Suzhou, China, proudly presents the QY4S315 Crane Reducer – a robust 4-stage cylindrical gearbox engineered specifically for heavy duty crane running mechanisms. With over 6 years of manufacturing experience and a factory spanning 10,000–30,000 square meters, we combine advanced technology and rigorous quality control to deliver reliable power transmission solutions. This reducer is designed to handle extreme loads, harsh environments, and continuous operation, making it the ideal choice for overhead cranes, gantry cranes, and other heavy lifting equipment.
The QY4S315 features a compact 4-stage gear train that provides high torque density and smooth power delivery. Each gear is case-hardened and precision ground to ensure minimal backlash and maximum efficiency. The housing is available in either high-strength cast iron or welded steel, both of which are machined to tight tolerances for perfect alignment and long service life. Whether you need a standard configuration or a customized solution, our team works closely with you to meet specific performance requirements.
Key Features & Technical Specifications
- 4-Stage Gear Design – Achieves high reduction ratios (up to 1:500) while maintaining a compact footprint.
- High Torque Capacity – Rated torque up to 315,000 Nm (depending on ratio), suitable for heavy duty crane travel drives.
- Efficient Power Transmission – Typical efficiency of 94% or higher, reducing energy losses.
- Durable Bearings & Seals – SKF or equivalent bearings and high-quality oil seals ensure long operation under dust and moisture.
- Flexible Mounting Options – Foot-mounted, flange-mounted, or custom mounting configurations available.
- Optional Backstop – Can be integrated with a backstop device to prevent reverse rotation.
- Versatile Lubrication – Oil bath standard; forced lubrication available for high-speed or high-temperature applications.
- Customizable Output Shaft – Solid or hollow shaft, keyed or splined, according to your crane mechanism.
| Parameter | Value / Range |
| Model | QY4S315 |
| Number of Stages | 4 |
| Ratio Range | 31.5 – 500 (custom ratios available) |
| Rated Torque (Nm) | Up to 315,000 |
| Input Speed (max) | 1800 rpm |
| Efficiency | ≥94% |
| Housing Material | Cast iron (HT250) / Welded steel (Q235B) |
| Weight (approx.) | 2,500 – 3,800 kg (depending on configuration) |
Benefits for Your Crane System
- Reliable Operation – The 4-stage design distributes load evenly, reducing gear wear and extending service life.
- Space-Saving – Compact size compared to multi-stage planetary gearboxes, easier to install in limited spaces.
- Low Noise & Vibration – Precision ground gears and rigid housing minimize noise, improving operator comfort.
- Cost-Effective – Competitive pricing without sacrificing quality, thanks to our efficient manufacturing processes.
- Global Compatibility – Standard input/output flanges and shafts compatible with major crane motor and drum brands.
- Easy Maintenance – Accessible inspection covers and drain plugs simplify oil changes and gear checks.
At Jiangsu Manqi Machinery, we have been serving customers in Eastern Europe, Southeast Asia, Africa, and South Asia since 2017. Our factory, staffed with 11–50 experienced professionals, utilizes advanced CNC machining centers and gear hobbing machines to ensure precision in every component. We ship from the Port of Shanghai with reliable packaging to protect against transit damage. Each reducer undergoes a 4-hour test run before delivery to verify torque, noise, and temperature performance.
We understand that every crane application is unique. That’s why we offer customization services including special shaft extensions, additional mounting brackets, and customized paint colors. Our engineering team is ready to support you with technical drawings and performance calculations. With a 12-month warranty against manufacturing defects and responsive after-sales support, you can rely on Manqi to keep your crane running smoothly.
Contact us today for a quotation or to discuss your specific requirements. Choose the QY4S315 Crane Reducer – the powerhouse your heavy duty crane running mechanism deserves.
Frequently Asked Questions
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What types of cranes is the QY4S315 suitable for?
This reducer is designed for heavy duty crane running mechanisms, including overhead cranes, gantry cranes, and portal cranes. It can also be used in other heavy machinery requiring high torque and low speed, such as hoists and winches. -
What is the standard ratio range?
The standard ratio range is from 31.5:1 to 500:1. Other ratios can be manufactured upon request to match your specific speed and torque requirements. -
Can the mounting position be customized?
Yes. The QY4S315 is available in foot-mounted, flange-mounted, or mixed configurations. We can also design custom mounting brackets to fit your existing crane structure. -
What lubrication method is recommended?
For most applications, oil bath lubrication is sufficient. If your crane operates in high-temperature environments or at high input speeds, forced lubrication (oil pump) can be added as an option. -
How long is the warranty period?
We offer a 12-month warranty from the date of shipment, covering manufacturing defects in materials and workmanship. -
Do you provide technical support for installation?
Absolutely. Our team provides installation manuals, alignment recommendations, and remote technical support. For complex projects, on-site guidance can be arranged. -
What certifications does the QY4S315 have?
Our products are manufactured according to industry standards. Specific certifications (e.g., CE, GOST) can be provided upon request depending on the destination market. Please check with our sales team for your region. -
What is the estimated lead time?
For standard configurations, lead time is typically 30–45 days. Custom orders may require 45–60 days, depending on complexity.
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