ZQ 400 Gearbox (Size 400) – 75mm Output Shaft | 3-5 Ton Load Capacity

If the ZQ 350 isn’t powerful enough for your system, then the ZQ 400 Gearbox is the perfect upgrade solution. As part of the heavy duty ZQ gearboxes category, the ZQ 400 boasts a massive size and superior shock load capacity, often referred to as being “built like a tank” in steel rolling mills and rock quarries.

Technical Specifications of ZQ 400 Gearbox (Size 400)

The ZQ 400 is significantly larger than the ZQ 350, particularly with a heavily reinforced output shaft and base. Below are the standard specifications:

• Center distance (A): 400mm.
• Output shaft diameter (Slow shaft):
  • Cylindrical shaft type (Z): 75mm (This is the most crucial parameter for machining couplings).
  • Gear shaft type (F): 75mm (Tooth module 6 or 7, number of teeth Z=13 - Used for coupling with hoist drum gears).
• Input shaft diameter (Fast shaft):
  • Tapered type: 50mm.
  • Cylindrical type: 45mm.
• Recommended motor power: For use with motors of 11kW (15HP), 15kW (20HP), or 18.5kW (25HP) - Speed 1450 rpm.
• Gear ratio (Ratio): i = 10, 12.5, 16, 20, 25, 31.5, 40, 48.57.
• Weight: ~ 260kg - 280kg (Nearly 100kg heavier than ZQ 350).
• Lubricant capacity: Approximately 4.0 - 5.0 Liters.

Why is the ZQ 400 the Number 1 Choice for 3-5 Ton Loads?

In the 3 to 5 ton load capacity segment, the ZQ 400 is virtually unmatched due to its advantages:

• 200% Overload Capacity: The ZQ 400 gears are made from 20CrMnTi carbon-nitrided steel with a hardness of 60 HRC. This allows it to withstand sudden shock forces (when starting a winch) up to twice the rated load without tooth breakage.
• Smooth Operation: Thanks to its heavy self-weight (nearly 300kg), the ZQ 400 eliminates most vibrations, allowing the system to operate much more smoothly compared to combining multiple smaller gearboxes.
• Robust Bearings: Uses large tapered roller bearings with excellent axial load capacity (very important for brick extruders and screw conveyors).

Practical Applications

ZQ 400 Gearbox commonly appears in large-scale production lines:

• Winching Systems: Coal wagon winches, ship slipway winches (Towing capacity 3-6 tons).
• Steel/Sheet Rolling Mills: Serves as the primary gearbox for sheet metal and thick purlin rolling machines.
• Stone Crushers: Drives for heavy rock conveyors in mining quarries.
• Double-Girder Overhead Cranes: Used for the traveling mechanism of 10-ton, 20-ton cranes.

Installation Notes for ZQ 400

• Reinforce Machine Foundation: Due to the gearbox’s weight and high torque, the foundation must be reinforced concrete or use an I-beam I200 or larger. Base bolts should be high-strength grade 8.8.
• Lubricating Oil: Fill with approximately 4-5 liters of high-viscosity oil (VG 320). Remember to check the oil every 3 months via the sight glass.

Related Models & Quotation

To choose the correct power and avoid waste, you can refer to the following:

• 👉 Smaller:ZQ 350 Gearbox (65mm shaft - Under 3 tons load).
• 👉 Larger:ZQ 500 Gearbox (85mm shaft, 400kg weight - 10 tons load).

Latest 2025 ZQ 400 Gearbox Quotation:

Thanh Thai Motor is proud to be a direct importer of ZQ 400, without intermediaries.

• Price: Guaranteed lowest price on the market (Contact us for dealer prices).
• Stock: Always have 10-20 units in stock at warehouses in Ho Chi Minh City and Hanoi.
• Shipping: Delivery by crane truck to your location (due to heavy weight).

Technical Consulting & Quotation Hotline: 0909.539.175