Case 1835B Left Side Drive Motor Removal: A Detailed Guide

[MikePhua]

The Case 1835B skid steer loader is a versatile and widely-used piece of construction equipment. It is known for its compact size, powerful hydraulic system, and the ability to perform a variety of tasks ranging from lifting and digging to material handling. Like any piece of machinery, the 1835B can experience mechanical issues that require repairs and maintenance. One of the more challenging tasks that operators and technicians might face is the removal of the left side drive motor. This task can be complicated but, with the right steps and tools, it can be done effectively and efficiently.
In this detailed guide, we’ll walk through the process of removing the left side drive motor of the Case 1835B, discuss potential challenges, and provide tips to make the process smoother. We will also touch on common issues related to the drive motor, including possible reasons for removal and the necessary tools for the job.
Understanding the Drive Motor System of the Case 1835B
Before we begin the removal process, it’s important to understand the role of the drive motor and the system in which it operates:

• Drive Motor Function: The drive motor in a skid steer loader such as the Case 1835B converts hydraulic pressure into mechanical energy. This energy is then used to drive the wheels, enabling the machine to move. The 1835B utilizes two drive motors, one for each side of the loader, which are connected to the machine’s hydraulic system.
  
• Hydraulic Power: The hydraulic pump provides the necessary pressure to operate the drive motors. If there is a failure or reduction in the hydraulic pressure or fluid flow, it can affect the performance of the drive motors.
  
• Drive Motor Design: The drive motors themselves are compact, high-torque motors that work under significant stress. They are designed to be durable, but like all mechanical parts, they can wear out over time due to factors like high load, dirt ingress, or insufficient lubrication.
  

Symptoms Indicating a Need for Drive Motor Removal
Typically, the drive motor needs to be removed when:

• Loss of Power or Movement: If the left side of the machine is not moving or is moving slower than the right side, this could indicate a failure in the drive motor. It may be caused by worn seals, a damaged motor, or issues within the hydraulic system.
  
• Hydraulic Fluid Leaks: Leaking hydraulic fluid around the drive motor area can be a sign that seals are damaged, or there may be a crack in the motor housing.
  
• Strange Noises: Unusual noises, such as grinding or whining, could be indicative of internal damage within the drive motor itself.
  
• Overheating: If the drive motor is running too hot, it could be a sign of internal failure or lack of proper lubrication.
  

Step-by-Step Guide to Removing the Left Side Drive Motor
Removing the left side drive motor of the Case 1835B requires careful planning and a methodical approach. Below is a step-by-step guide to help you with the process:
1. Preparation and Safety Measures
Before starting any maintenance procedure, safety is the priority:

• Park the Machine: Ensure the machine is on a level surface, and engage the parking brake.
  
• Power Down: Turn off the engine and disconnect the battery to avoid electrical accidents.
  
• Hydraulic Pressure Relief: Relieve all hydraulic pressure by following the manufacturer's instructions. This is essential to avoid any sudden hydraulic movements when you disconnect the drive motor.
  

2. Remove the Left Side Wheel or Tracks

• Disengage the Wheels: Depending on whether your 1835B is a wheeled or tracked version, you will need to remove the left side wheel or tracks. This will give you access to the drive motor.
  
• Loosen and Remove Fasteners: Use the appropriate tools (such as a wrench or impact driver) to remove the bolts or fasteners holding the wheels or tracks in place.
  

3. Disconnect the Hydraulic Lines

• Identify Hydraulic Hoses: Find the hydraulic hoses connected to the left-side drive motor. These are typically high-pressure lines that provide the necessary fluid to power the motor.
  
• Prepare for Fluid Spillage: Place a drain pan or rags underneath the hydraulic hoses to catch any fluid that may spill out during disconnection.
  
• Loosen Fittings: Use a wrench to loosen the fittings securing the hydraulic lines to the motor. Once loosened, carefully disconnect the hoses.
  

4. Remove the Motor Mounting Bolts

• Identify the Motor Mounting Bolts: The drive motor is typically secured to the frame of the loader with several large bolts. These bolts must be removed to free the motor from the machine.
  
• Loosen and Remove Bolts: Use a heavy-duty socket wrench or impact wrench to loosen and remove the bolts. It may be necessary to support the motor during this process to prevent it from falling once the bolts are removed.
  

5. Remove the Drive Motor

• Lift the Motor: Once the mounting bolts are removed, carefully lift the motor from its position. Depending on the weight, it may be useful to have a second person or a hoist to assist with this step.
  
• Inspect the Motor: Before setting the motor aside, inspect it for visible damage or wear, such as cracks in the housing, damaged seals, or metal shavings in the fluid.
  

6. Install the New or Repaired Drive Motor

• Place the New Motor: Position the new or repaired motor in the same location from which the old motor was removed.
  
• Secure the Mounting Bolts: Tighten the mounting bolts to secure the motor to the frame. Ensure that they are torqued to the manufacturer's specifications to avoid any movement.
  
• Reconnect Hydraulic Lines: Reconnect the hydraulic hoses to the new motor, ensuring that they are tightly secured and that no leaks are present.
  

7. Reinstall the Wheels or Tracks

• Reattach the Wheel or Track: Place the wheel or track back on its axle, securing it with the necessary fasteners. Tighten the bolts as per the manufacturer’s guidelines.
  

8. Refill Hydraulic Fluid

• Check Hydraulic Fluid Levels: After reassembly, check the hydraulic fluid levels and top up if necessary.
  
• Bleed the System: Bleed any air out of the hydraulic lines to ensure that the motor operates smoothly without erratic movements.
  

9. Test the Motor

• Start the Machine: Reconnect the battery and start the machine. Observe the left-side drive motor's performance. Test the movement of the machine to ensure the new motor is functioning correctly.
  
• Check for Leaks and Noise: Monitor for any signs of leaks or unusual noises. If the motor is still not functioning properly, further investigation may be required.
  

Common Problems During Removal
While the removal process is fairly straightforward, certain challenges may arise:

• Stuck or Rusted Bolts: Bolts holding the motor in place may become stuck due to rust or debris. Using penetrating oil can help loosen stubborn bolts. If this doesn’t work, using an impact wrench or a breaker bar can provide the necessary torque to break them loose.
  
• Hydraulic Fluid Spillage: It’s important to handle hydraulic fluid with care. Any leakage during disconnection can result in fluid loss or contamination of the workspace. Always use clean rags and a drain pan to catch any excess fluid.
  
• Heavy Motor: The drive motor is relatively heavy and can be difficult to remove, especially if it has not been removed in a while. Using a hoist or a lifting device can make this process easier and safer.
  

Conclusion
The removal of the left-side drive motor in a Case 1835B skid steer loader is a critical task that requires careful planning and attention to detail. By following the steps outlined above and using the correct tools, operators can successfully remove and replace the motor, ensuring that the loader performs at its best. Regular maintenance and timely repairs will help keep your Case 1835B in top condition, minimizing downtime and extending the machine’s lifespan.