Troubleshooting and Repairing the TB045 Slew Motor Leak

[MikePhua]

The Terex TB045 is a versatile compact excavator designed for tight spaces and heavy lifting. However, like any piece of heavy equipment, it can encounter mechanical issues over time. One of the most common problems that operators face with the TB045 is a leaking slew motor, which can result in reduced performance, loss of power, or potential damage to other components.
In this article, we will dive into the causes of a leaking slew motor, how to diagnose the issue, and provide repair tips to get your Terex TB045 back to optimal performance. Understanding how to troubleshoot and repair this issue will not only save you money on repairs but also ensure that your equipment operates safely and efficiently.
Understanding the Slew Motor
The slew motor, often referred to as the swing motor, is an essential component of any excavator, including the Terex TB045. It’s responsible for enabling the upper structure of the excavator to rotate (or "swing") around the lower chassis. This rotation allows the operator to position the bucket or other attachments at various angles, making the excavator more versatile on the job site.
The slew motor is connected to a hydraulic system that generates the force necessary to move the upper body. Over time, various factors can cause leaks in the motor, leading to diminished performance and the need for repair or replacement.
Common Causes of Slew Motor Leaks
There are several potential causes of a leaking slew motor in the Terex TB045. Identifying the source of the leak early on can help prevent more extensive damage to the system. Common causes include:

1. Worn or Damaged Seals
   The most frequent cause of leaks in the slew motor is damaged or worn seals. The seals are designed to contain hydraulic fluid within the motor and prevent it from leaking out. If the seals become worn or damaged due to age or wear and tear, fluid can escape, leading to a loss of hydraulic pressure and reduced functionality.
   • Story: A contractor working on a construction site noticed that their TB045 was struggling to rotate as smoothly as usual. Upon inspection, they found that the slew motor seals were deteriorated, leading to hydraulic fluid leaks. Replacing the seals solved the problem and restored full functionality.
     
2. Cracks or Damage to the Slew Motor Housing
   Physical damage to the slew motor housing, such as cracks or dents, can also lead to leaks. This could be the result of impacts, extreme temperatures, or even manufacturing defects.
   • Example: An excavator operator found that their TB045 was leaking hydraulic fluid after accidentally hitting a concrete barrier. Upon inspection, they discovered a small crack in the slew motor housing that was causing the leak. After replacing the motor housing, the issue was resolved.
     
3. Over-Pressurization of the Hydraulic System
   If the hydraulic system becomes over-pressurized, it can force fluid past seals and cause leaks. This could be due to a malfunctioning pressure relief valve, faulty hydraulic pump, or other related issues.
   • Example: On a larger construction site, a fleet manager noticed that several Terex TB045 machines were leaking hydraulic fluid after prolonged use. The issue was traced back to a faulty pressure relief valve, which had caused the hydraulic system to exceed the safe pressure levels. After replacing the valve, the leaking stopped.
     
4. Improper Maintenance
   Poor maintenance practices can contribute to a variety of issues, including leaking slew motors. This includes using incorrect hydraulic fluids, failing to replace worn-out seals or components, or neglecting routine inspections.
   • Example: An operator was having frequent issues with their TB045, including a persistent slew motor leak. After reviewing the maintenance logs, it was discovered that the machine had not been serviced according to the recommended intervals. Once the machine was serviced and the seals replaced, the problem was resolved.
     

How to Diagnose a Leaking Slew Motor
Diagnosing a leaking slew motor on the Terex TB045 can be done through a series of systematic steps. Here’s how to identify the source of the leak:

1. Visual Inspection
   Start by performing a visual inspection of the slew motor and surrounding components. Look for any obvious signs of hydraulic fluid around the motor, hoses, and connections. Leaks may appear as wet spots or pools of fluid.
   
2. Check for Fluid Loss
   Monitor the hydraulic fluid levels in the system. If you notice a drop in fluid levels over time, this could indicate a slow leak that is affecting the performance of the slew motor.
   
3. Check for Pressure Loss
   If the slew motor is not rotating as smoothly as usual, or if there is noticeable jerking or hesitation, this could indicate a loss of hydraulic pressure due to a leak.
   
4. Inspect the Seals
   If you can access the slew motor’s seals, inspect them for wear, cracks, or damage. A worn-out seal is the most common cause of leaks and should be replaced to restore proper function.
   
5. Listen for Unusual Noises
   Listen for any unusual noises, such as whining or grinding sounds, coming from the slew motor. These noises could indicate a loss of hydraulic fluid and internal damage to the motor.
   

Repairing a Leaking Slew Motor
Once you've diagnosed the issue, the next step is repairing the leaking slew motor. Here are the steps to take:

1. Shut Down the Machine
   Before you begin any repairs, ensure that the excavator is powered down and the hydraulic system is depressurized to avoid injury.
   
2. Remove the Slew Motor
   In most cases, you’ll need to remove the slew motor from the excavator to inspect and repair it. This can be a complex process, so refer to the machine's service manual for specific instructions. Typically, you’ll need to disconnect the hydraulic lines, remove mounting bolts, and carefully take the motor off the frame.
   
3. Inspect the Motor Internally
   Once the motor is removed, take a closer look at the internal components. Check for any signs of damage or wear, particularly to the seals, bearings, and gears. If necessary, replace any parts that are damaged or excessively worn.
   
4. Replace the Seals
   If the seals are the cause of the leak, it’s best to replace them. This is often the most straightforward repair and can prevent further issues. Make sure to use OEM (Original Equipment Manufacturer) seals to ensure a proper fit and seal.
   
5. Reassemble and Test the Motor
   After replacing the seals or repairing any damaged components, reassemble the slew motor and reattach it to the machine. Reconnect the hydraulic lines, tighten the bolts, and ensure that everything is properly aligned.
   
6. Check for Leaks
   Once the motor is reassembled, power up the machine and check for any remaining leaks. Monitor the fluid levels and test the functionality of the slew motor to ensure that it is operating correctly.
   

Preventative Maintenance for the TB045 Slew Motor
To avoid future issues with the slew motor and prevent leaks, consider these preventative maintenance tips:

1. Regularly Check Fluid Levels
   Ensure that the hydraulic fluid levels are always within the recommended range. Low fluid levels can cause strain on the system and increase the risk of leaks.
   
2. Use the Correct Hydraulic Fluid
   Always use the correct type of hydraulic fluid as specified in the owner’s manual. Using the wrong fluid can damage seals and other components over time.
   
3. Inspect Seals and Hoses
   Regularly inspect the seals and hoses for signs of wear or damage. Replace seals at the first sign of deterioration to avoid leaks.
   
4. Service the Excavator Regularly
   Follow the recommended service intervals in the operator’s manual. Regular maintenance checks can catch potential problems before they become major issues.
   

Conclusion: Keeping Your Terex TB045 in Top Shape
A leaking slew motor on the Terex TB045 can cause significant operational issues, but with regular inspections, prompt diagnosis, and proper repairs, the problem can be resolved quickly. By understanding the common causes of leaks and following proper maintenance practices, you can extend the life of your machine and keep it performing at its best.
Whether it’s replacing seals, addressing over-pressurization, or ensuring your machine is serviced on time, the key to preventing future problems is staying proactive with maintenance. With the right approach, your Terex TB045 can continue to provide reliable service for many years.