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GHX250 Crane Hoist Gearbox – Product Overview

The GHX250 is a crane hoist gearbox designed specifically for wire rope drum lifting mechanisms. It is typically paired with dual-speed motors or variable-frequency drives (VFDs) and is suitable for bridge cranes, gantry cranes, tower cranes, and similar lifting systems.
Featuring a drum-shaft direct mounting structure, the GHX250 offers a compact, lightweight design that delivers high torque transmission even in limited installation spaces. It is frequently listed in industry selection manuals and is commonly used as a drive unit for ZFB-type hoisting mechanisms, ideal for both engineering applications and OEM equipment requiring smooth lifting and long service life.

Gear Design, Housing Material & Lubrication

The GHX250 adopts a three-stage helical gear transmission with an increased center distance to enhance torque capacity and operational lifespan.
The housing is typically made from aluminum alloy—reducing weight and improving heat dissipation—or from treated steel or cast housing for heavy-duty use. Surface anti-corrosion treatment is available for outdoor or dusty environments.

The gears are hardened and precision ground for improved meshing accuracy and wear resistance, while key transmission shafts undergo surface hardening to extend service life.
Lubrication is provided by high-grade gear oil, with optional forced circulation or fan-assisted cooling for high-duty-cycle operations to maintain temperature stability.
High-quality bearings and seal assemblies minimize maintenance frequency and maximize uptime. The overall design focuses on delivering high starting torque, low noise, and compact dimensions—balancing power density and durability.

Application Scenarios for Bridge, Gantry & Tower Cranes

The GHX250 is suitable for a wide range of wire rope drum-driven lifting systems, including:

• Bridge cranes used in industrial workshops

• Gantry cranes for ports, yards, and logistics facilities

• Tower cranes as the main hoisting drive unit

In the agricultural sector, the GHX250 is also widely adopted by OEM manufacturers for applications such as bulk material handling, straw lifting, and bale hoisting, where medium-to-low speed and high torque are required.

Typical performance examples include:

• A 4/1 reeving system achieving a lifting speed of 4–8 m/min, ideal for continuous light-to-medium-duty operations.

• For heavier loads (20–40 tons), pairing the GHX250 with an appropriate reduction ratio and higher-power motor provides stable lifting for short-duty heavy-load applications.

When selecting a model, consider the duty cycle (S1 continuous or intermittent), ambient temperature, and required protection level to ensure long-term, reliable operation in your specific working conditions.

GHX250 Installation and Commissioning Guide

Installation Essentials

Axial and Radial Alignment:
During installation, ensure that the motor and gearbox shafts are properly aligned both axially and radially.
If a coupling is used, loosen the coupling fasteners first and perform a rough alignment. Gradually tighten the bolts while checking alignment until radial runout and axial deviation are within the manufacturer’s specified tolerance.

Tightening Sequence:
Flange bolts connecting the drum shaft and gearbox housing should be tightened diagonally in multiple stages to ensure even stress distribution and to prevent deformation.
All bolts must be tightened to the recommended torque values and secured using spring washers or thread-locking methods to prevent loosening during operation.

Gear Engagement Check:
After installation, manually rotate the drum shaft to verify that gear meshing is smooth and uniform, with no contact interference or jamming.
Inspect the bearings and seals for proper seating. If abnormal noise, resistance, or vibration is detected, stop immediately and readjust or reassemble as needed.

Coupling or Flange Connection:
Once alignment is complete, allow for proper thermal expansion and contraction clearance between connected components.
Follow the manufacturer’s recommendations for coupling gap or shim thickness, ensuring that excessive preload is avoided to prevent bearing overload.

Commissioning Procedure

No-Load Test Run:
Before energizing the motor, confirm that the oil level, fasteners, and protective covers are in place.
At initial startup, torque demand may be high—run at low speed under no load for 5–10 minutes while monitoring bearing temperature, noise, and vibration levels.

Low-Speed Observation:
Operate at low speed (low gear or VFD-controlled speed) to check lubrication flow, seal integrity, and temperature rise.
Ensure there are no abnormal odors, smoke, or signs of oil leakage.

Load Test:
Gradually apply load and monitor temperature increase and operating stability.
Upon completion of the rated load test, verify brake function and safety interlocks.

Safety Brake Verification:
Under rated working conditions, test the braking distance and reliability.
Ensure that the braking system can stop safely within the specified distance in the event of power loss or an emergency stop command.