Gearboxes are critical power transmission systems that adapt the speed and torque received from an electric motor or another drive source to the requirements of the machine. From production lines and conveyor systems to lifting equipment and heavy industrial machinery, gearboxes play an essential role in maintaining continuous operation across many industrial applications.

Over extended periods of operation, high loads, insufficient lubrication, bearing problems, or natural wear can cause damage to gears, shafts, bearings, and other mechanical components inside the gearbox.

At Erdişli Makina, we provide solutions for industrial gearbox maintenance and overhaul, as well as the remanufacturing of worn or damaged gears and mechanical spare parts.

We particularly support machinery restoration by reproducing gearbox components that are unavailable on the market, discontinued, or subject to long lead times, based on technical drawings or existing samples.

Why Is Gearbox Maintenance Important?

Gearboxes are mechanical systems that often operate continuously under load in industrial applications.

Gear pairs, shafts, bearings, and other moving components are constantly exposed to mechanical stresses during operation. If wear is not detected and addressed in time, a relatively small mechanical issue can develop into more serious damage.

Regular inspection and maintenance can help:

• Detect gear wear at an early stage

• Identify bearing-related problems

• Evaluate abnormal operating noise

• Check vibration and mechanical clearances

• Detect lubrication problems

• Reduce unplanned machine downtime

• Prevent more serious mechanical damage

Monitoring gearbox operating conditions is particularly important in facilities where production continuity is critical.

Signs of Gearbox Failure

Some mechanical gearbox problems may show warning signs before complete failure occurs.

Common indicators include:

• Higher-than-normal operating noise

• Humming, knocking, or impact sounds

• Excessive vibration

• Increased gearbox temperature

• Oil leakage

• Irregular operation

• Excessive shaft or bearing clearance

• Changes in output performance

• Abnormal sounds from the gears

When these symptoms are observed, inspecting the gearbox operating conditions and mechanical components can help prevent more extensive damage.

Gearbox Maintenance and Overhaul Services

During gearbox maintenance and overhaul, the condition of the mechanical components inside the system is evaluated to identify worn or damaged parts.

Depending on the gearbox design and the type of failure, the work may include:

• Inspection of gears

• Inspection of gear shafts

• Inspection of worms and worm gears

• Evaluation of shafts and bearing areas

• Bearing inspection

• Inspection of keys and keyways

• Evaluation of mechanical clearances

• Identification of worn components

• Remanufacturing of required spare parts

• Replacement or renewal of mechanical components

The objective is not only to replace the damaged component, but also to evaluate the mechanical conditions that may have caused the failure wherever possible.

Gearbox Spare-Part Manufacturing

One of the key advantages of Erdişli Makina's gearbox services is our custom spare-part manufacturing capability.

When the original component for a particular gearbox brand or model is unavailable, the existing part can be evaluated as a sample and reproduced.

Depending on requirements, we can provide manufacturing solutions for gearbox components such as:

• Spur gears

• Helical gears

• Bevel gears

• Pinion gears

• Gear shafts

• Pinion shafts

• Worm shafts

• Worm gears

• Bronze worm gears

• Custom gears

• Shafts

• Keyed connection components

This makes it possible to reproduce existing gearbox components rather than relying solely on standard replacement parts.

Gearbox Gear Manufacturing from Samples

One of the main challenges with older or imported gearboxes is access to technical drawings and original spare parts.

The original manufacturer may no longer be in business, the model may have been discontinued, or replacement parts may require long international lead times.

In such cases, the existing gear removed from the gearbox can be evaluated as a sample to determine the required technical specifications.

Parameters that can be evaluated from the sample include:

• Gear type

• Module

• Number of teeth

• Face width

• Tooth geometry

• Helix angle and direction

• Shaft or hub dimensions

• Keyway

• Material properties

Based on these parameters, a replacement gear can be manufactured.

Gear Shaft Manufacturing for Gearboxes

In some gearboxes, the gear is not a separate component mounted onto the shaft. Instead, the gear geometry is machined directly onto the shaft, forming a gear shaft or pinion shaft.

When such components are damaged, replacing only the gear may not be possible.

At Erdişli Makina, we provide solutions for reproducing spur and helical gear shafts and pinion shafts used in gearboxes according to technical drawings or existing samples.

In addition to tooth geometry, shaft diameters, bearing surfaces, connection details, and operating conditions are evaluated during manufacturing.

Worm Shaft and Bronze Worm Gear Replacement

In worm gearboxes, the primary power transmission components are the worm shaft and the mating worm gear.

Because sliding contact occurs between the surfaces, wear can develop over time, particularly under insufficient lubrication, heavy loads, or extended operating periods.

In many applications, a steel worm shaft operates together with a bronze worm gear.

For worn worm gear systems, the existing components can be evaluated and new worm shafts or bronze worm gears can be manufactured according to technical requirements.

Whenever possible, evaluating both mating components together is important for checking tooth contact and overall system compatibility.

Material Selection for Gearbox Gears

Selecting the correct material for gearbox spare parts is critical to operating performance and service life.

Depending on the application, gear and shaft components can be manufactured from:

• 4140

• 8620

• 1040

• 17CrNiMo6

• Bronze

Other materials suitable for specific project requirements can also be evaluated.

Material selection should consider gearbox operating speed, transmitted torque, gear type, impact loads, operating duration, and the characteristics of existing mating components.

Heat Treatment Options

Gearbox gear teeth operate under continuous contact, making wear resistance an important consideration.

Depending on the material and technical requirements of the component, heat treatment processes such as carburizing, induction hardening, and nitriding can be evaluated.

The correct combination of material and heat treatment can help provide the required mechanical properties at the tooth surfaces and extend component service life.

Why Should More Than the Damaged Gear Be Checked?

A broken or severely worn gear does not always mean that the problem originated from that component alone.

Potential underlying causes may include:

• Bearing clearance

• Shaft bending

• Misalignment

• Incorrect tooth contact

• Insufficient lubrication

• Overloading

• Impact loading

• Improper assembly

• Wear on the mating gear

For this reason, in addition to replacing the damaged component, the mating gear, shafts, bearings, and general mechanical structure should also be evaluated.

Otherwise, the newly manufactured replacement component may become damaged again within a short period.

Spare Parts for Older and Discontinued Gearboxes

Industrial gearboxes can remain in service for decades. However, during this time, manufacturers may discontinue certain gearbox models or end spare-part support.

When the gearbox itself remains serviceable, replacing the entire system because of a single gear or shaft may not be economical.

Reproducing worn components from technical drawings or existing samples can, where technically appropriate, help extend the economic service life of the gearbox.

For this reason, the remanufacturing of gears and mechanical spare parts for discontinued gearboxes is one of our important service areas.

Spare-Part Manufacturing for Imported Gearboxes

Sourcing spare parts for imported gearboxes from overseas can result in long delivery times and high costs.

Particularly when a production line is out of operation, waiting weeks for a replacement part can lead to significant production losses.

Where technical conditions are suitable, local manufacturing based on an existing component or technical drawing can provide an alternative solution for reproducing the required mechanical part.

Importance of Lubrication in Gearbox Maintenance

Proper lubrication is critical for reliable operation of gears and bearings inside a gearbox.

Incorrect lubricant selection, insufficient oil level, degraded lubricant, or contamination can accelerate gear and bearing wear.

The lubricant type, viscosity, and maintenance intervals specified by the gearbox manufacturer should be taken into consideration.

Metal particles or unusual discoloration in the lubricant may, in some cases, indicate internal mechanical wear.

What Should Be Checked During Gearbox Maintenance?

To help preserve gearbox service life, the following should be inspected regularly:

• Oil level

• Oil condition

• Oil leakage

• Operating temperature

• Abnormal noise

• Vibration

• Shaft clearances

• Bearing condition

• Gear contact surfaces

• Fasteners and connections

Maintenance frequency should be determined according to the gearbox manufacturer's recommendations, operating duration, load conditions, and environmental factors.

What Types of Gearboxes Do We Service?

We provide solutions for the gear and spare-part requirements of gearboxes with various mechanical configurations used in industrial applications.

These may include:

• Helical gearboxes

• Spur gearboxes

• Bevel gearboxes

• Worm gearboxes

• Custom machinery gearboxes

• Industrial power transmission gear units

The gearbox design and current condition are evaluated to determine suitable maintenance, overhaul, and component manufacturing options.

Applications of Gearbox Maintenance and Spare-Part Services

Since gearboxes are used throughout industry, maintenance and spare-part requirements cover a broad range of sectors and applications.

Typical areas include:

• Manufacturing facilities

• Iron and steel industry

• Machinery manufacturing

• Conveyor systems

• Lifting and material handling systems

• Agricultural machinery

• Food processing machinery

• Packaging machinery

• Textile machinery

• Metalworking machinery

• Automation systems

• Heavy industrial equipment

• Custom-built machinery

Maintenance, Overhaul and Spare Parts from a Single Source

One of the key advantages of Erdişli Makina's gearbox maintenance capabilities is our ability to combine maintenance work with in-house gear and mechanical spare-part manufacturing.

From identifying the damaged component to manufacturing a replacement gear or shaft, the required mechanical solutions can be managed through a single production process.

This provides a significant advantage particularly in maintenance and overhaul projects where standard replacement parts are unavailable.

Rather than relying only on ready-made spare parts, custom replacement components can be reproduced according to the requirements of the existing system.

Why Erdişli Makina?

We bring our experience in machine gear and spare-part manufacturing since 1987 to industrial gearbox maintenance and overhaul projects.

From spur, helical, bevel, and pinion gears to gear shafts, worm shafts, and bronze worm gears, we can reproduce the primary mechanical power transmission components used in gearboxes according to technical drawings or existing samples.

We provide solutions for custom parts required in gearboxes where standard spare parts are unavailable, discontinued, or difficult to source internationally.

Our objective is not simply to replace a failed component, but to evaluate the gearbox operating conditions and power transmission system in order to provide a reliable and long-lasting maintenance solution.

For gearbox maintenance, gearbox overhaul, gearbox gears, gear shafts, worm shafts, bronze worm gears, or gearbox spare parts manufactured from existing samples, contact Erdişli Makina.