ZQ 350 Gearbox (Size 350) – 65mm Output Shaft

The ZQ 350 Gearbox is one of the best-selling gearbox models in the ZQ gearbox category at Thanh Thai Motor. Featuring superior size and weight (nearly twice as heavy as the ZQ 250 size), the ZQ 350 Gearbox is trusted absolutely in heavy-duty applications such as logging winches, stone crushers, and workshop overhead cranes.

General Design of the ZQ Gearbox

The ZQ gearbox series in general, and the ZQ 350 Gearbox size in particular, strongly reflects the design language of heavy-duty industrial machinery.

The unit features a large horizontal rectangular shape with a parallel input and output shaft layout. This design facilitates easy power transmission via pulleys, sprockets, or couplings.

The entire housing is cast in one piece from specialized alloy cast iron. A design highlight is the prominent ribs along the body, which not only increase rigidity to prevent deformation under high torque, but also act as natural cooling fins. The integrated mounting base is very wide and flat, equipped with standard bolt holes to securely fix the ZQ 350 Gearbox to the machine base.

Structure of the ZQ 350 Heavy-Duty Gearbox

The ZQ 350 Gearbox (JZQ 350) is specifically designed to operate in harsh industrial environments, withstanding heavy loads and severe impacts. The internal and external structure of the device includes the following components:

• Housing: Cast in one piece from high-quality alloy cast iron with a very thick wall. This design not only helps the device withstand mechanical impact well but also supports efficient heat dissipation during continuous operation.
• Gear system: The ZQ 350 Gearbox utilizes a helical gear system (or herringbone gear depending on the version). The gears are precision-machined and undergo a heat treatment process (carburizing and quenching) to increase surface hardness, resist wear, and ensure powerful, smooth transmission capabilities.
• Input and output shafts: Made from super-hard alloy steel. The input shaft is flexibly designed in a tapered shape (40mm) or cylindrical shape (35mm) for easy motor connection. The output shaft has a large diameter of up to 65mm, specialized for applications requiring maximum torque.
• Bearings and oil seals: Heavy-duty bearings are used to ensure smooth shaft rotation. High-end oil seals are tightly fitted, completely preventing oil leakage and protecting against dust intrusion.

Technical Specifications of the ZQ 350 Gearbox (Size 350)

To avoid confusion with smaller sizes, please carefully check the shaft dimensions before ordering. The ZQ 350 Gearbox is best suited for installation with a 5.5kW, 7.5kW, or 11kW motor (speed of 1450 rpm), with transmission ratios i = 8.23, 10.35, 12.64, 15.75, 20.49, 23.34, 31.50, 40.17, 48.57. Standard specifications are as follows:

Practical Applications of the ZQ 350 Gearbox

The ZQ 350 Gearbox is a crucial component of heavy-duty industrial machinery:

• Logging winches, marine pulling winches: Easily pulls loads from 1 ton – 3 tons.
• Scrap shredders: Shredding plastics, tree bark, and rubber processing.
• Brick extrusion machines: Used in tunnel brick plants, unburnt brick plants (large pressing machines).
• Overhead cranes: Main lifting mechanism for 5-ton double-girder overhead cranes (via pulleys).

Guide on How to Add Oil to the ZQ Gearbox

For the ZQ 350 Gearbox to operate durably and smoothly and to extend gear life, proper oil filling and replacement are extremely important.

• Identify plug locations: On the ZQ gearbox body, there will be 1 oil filling plug (usually located on the top or back cover, integrated with a breather vent) and 1 oil sight glass located on the side.
• Pour new oil: Open the top oil filling plug. Slowly pour 2.5 to 3.5 liters of oil into the gearbox.
• Observe the oil sight glass: Observe the sight glass while pouring. When the oil level rises to the middle (1/2) of the oil sight glass, stop. This is the most optimal lubricant rating; do not fill past the mark (causing overheating, seal blowout) or fill too little (insufficient gear lubrication).

With its sturdy design and finely machined components, the ZQ 350 Gearbox delivers superior working performance and the highest level of safety for workshops.

For the most intuitive view of the design, dimensions, and actual operation of the product, customers can immediately refer to our compilation video and gearbox videos on our channel.

Warranty, Shipping, and Commitment Policy at Thanh Thai Motor

When purchasing gearboxes at Thanh Thai Motor, you will receive benefits such as:

Warranty up to 24 months

Gearbox products at Thanh Thai Motor are covered by a genuine warranty for up to 24 months. Customers can be completely confident in using them with a clear, transparent, and prompt after-sales policy.

Nationwide Delivery

We support fast delivery to all provinces and cities nationwide. Wherever you are, products are guaranteed to arrive on time and safely.

Products meeting European quality standards with German technology

Gearboxes at Thanh Thai Motor are manufactured using advanced German technology, meeting European quality standards. Ensuring high durability and stable operation for extended periods.

Competitive prices, good discounts for dealers and bulk customers

Reasonable prices, many attractive offers for wholesale buyers and distribution agents. The more you buy, the higher the discount – optimizing profits for customers.

Full certification documents: CO, CQ,...

Each product comes with full Certificate of Origin (CO) and Certificate of Quality (CQ). This provides assurance for customers when using them in projects or constructions requiring technical documentation.

Contact for Purchase

Do you need advice on choosing the right gearbox for your needs? Contact Thanh Thai Motor immediately using the methods below:

• WhatsApp: +84966596219
• Email: codienthanhthai@gmail.com