How to Replace a Final Drive on Your Excavator: Step-by-Step Guide Using a PROSUNG Final Drive

When your excavator starts showing signs of travel issues—such as sluggish movement, grinding noises, or hydraulic fluid leaks—there’s a good chance your final drive motor is to blame. Replacing a faulty final drive doesn’t have to mean downtime for days. With the right part and proper guidance, you can get your machine back to work efficiently.

In this blog, we’ll walk you through how to replace the final drive on your excavator step-by-step, using a high-quality PROSUNG final drive supplied by Pro Construction Parts Ltd—a trusted UK supplier of heavy equipment parts.

🏗️ Why Choose a PROSUNG Final Drive?

PROSUNG final drives are engineered for durability, performance, and compatibility with major excavator brands like Komatsu, Caterpillar, Bobcat, Takeuchi, Doosan, Hitachi, and more. Whether you're a plant hire operator, construction firm, or independent contractor, PROSUNG delivers reliability without breaking the bank.

When you order from Pro Construction Parts Ltd, you get:

  • Fast nationwide-wide shipping

  • Expert customer support

  • Competitive pricing

  • Genuine PROSUNG warranty

🔍 Common Signs You Need a Final Drive Replacement

Before we get into the fitting, here are a few symptoms that might indicate your excavator final drive is on its way out:

  • Travel motors stalling under load

  • Leaking hydraulic fluid

  • Overheating final drive casing

  • Unusual grinding or clicking noises

  • Loss of power on one track

🔧 Tools & Equipment You'll Need

Before starting the installation of your new PROSUNG final drive, make sure you’ve got the following:

  • Crane, hoist, or lifting chain (your excavator can be used in some cases)

  • Spanner and socket sets

  • Torque wrench

  • Pry bars and hammer

  • Sealant and cleaning supplies

  • New hydraulic oil

  • Drip tray for fluid

  • Full PPE: gloves, safety boots, eye protection

🛠️ Step-by-Step Guide to Replacing Your Final Drive

Step 1: Safety First

  • Park your excavator on stable, level ground.

  • Switch off the engine and remove the ignition key.

  • Relieve hydraulic pressure by moving controls with the engine off.

  • Block the tracks to prevent machine movement.

Step 2: Remove the Track

  • Release the track tension by opening the grease fitting valve.

  • Retract the idler and pull the track off the final drive sprocket.

  • Set the track aside safely.

Step 3: Disconnect Hydraulic Hoses

  • Label or take a photo of your hydraulic hose connections.

  • Remove the hoses and cap both sides to prevent contamination.

  • Collect any escaping fluid in a container.

Step 4: Remove the Old Final Drive

  • Use lifting equipment to support the old final drive unit.

  • Remove the mounting bolts from the final drive flange.

  • Gently remove the drive motor—pry bars may help if it's stuck in place.

Step 5: Clean the Mounting Area

  • Thoroughly clean the final drive mounting surface.

  • Remove any debris, old gasket material, or rust.

  • Inspect for damage—especially cracks or distorted bolt holes.

Step 6: Install the New PROSUNG Final Drive

  • Use lifting equipment to align the new PROSUNG drive to the flange.

  • Insert all mounting bolts and tighten them evenly finger-tight.

  • Torque all bolts to the manufacturer’s specification (typically 150–300 Nm).

Step 7: Reconnect Hydraulic Hoses

  • Attach hoses to the correct ports (refer to your labels or photos).

  • Use thread sealant only if your manual recommends it.

  • Tighten all fittings securely.

Step 8: Bleed the Hydraulic System (if required)

  • Some machines require bleeding air from the hydraulic system.

  • Refer to your machine’s service manual for proper procedure.

Step 9: Reinstall the Track

  • Carefully wrap the track around the sprocket and idler.

  • Apply grease to re-tension the track to factory specifications.

Step 10: Test Your Excavator

  • Start the machine and let it idle.

  • Slowly operate the travel function in both directions.

  • Listen for any abnormal sounds and check for leaks.

  • Recheck bolt torque after the first hour of operation.

💡 Pro Tips for Final Drive Maintenance

To extend the life of your new PROSUNG final drive:

  • Check and change final drive oil every 500 hours or as per OEM guidelines.

  • Avoid overloading or turning too aggressively.

  • Regularly inspect seals and listen for early signs of failure.

📦 Order Your PROSUNG Final Drive Today

Looking for a reliable, cost-effective replacement final drive?
Pro Construction Parts Ltd has you covered.

👉 We stock a wide range of PROSUNG final drives for:

  • Takeuchi TB125, TB216, TB290

  • Hitachi ZX55, ZX70

  • Bobcat E26, E45, E85

  • Caterpillar 303.5, 304.5, 305.5

  • …and many more.

Visit our website or contact our expert team for help choosing the right model.

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