08-17-2025, 09:38 PM
Replacing the drive belt on a Komatsu S175 compact track loader is a moderate task that requires some mechanical aptitude but is manageable even for a beginner with the right tools and guidance.
Preparation and Tools Needed
A first-time Komatsu S175 owner hesitated before attempting a belt replacement, worried about the machine’s complexity. Following a detailed guide and carefully documenting each step, they successfully replaced a cracked belt and rejuvenated the machine’s performance. The satisfying result gave confidence to handle future maintenance tasks independently.
Summary List
Preparation and Tools Needed
- Basic hand tools including wrenches (metric sizes commonly 18mm or 19mm for tensioner bolts)
- Ratchet with appropriate sockets or a wrench
- Pry bar or screwdriver for removing covers or belts under tension
- Safety gloves and eye protection
- Service manual or reference guide for torque specifications is highly recommended
- Battery and Safety: Disconnect the battery to avoid accidental startup.
- Remove Belt Cover: Detach the belt cover by removing the bolts. The cover usually slides off when bolts are removed.
- Locate the Belt Tensioner: The tensioner assembly keeps the belt tight and often includes two bolts for tension adjustment.
- Loosen the Tensioner Bolts: Using appropriate sized wrenches, loosen the tensioner bolts to relieve tension on the belt. Keep the belt intact if possible to reference routing.
- Lift the Tensioner: Using a ratchet or pry bar, lift the tensioner arm away from the belt groove to free the belt.
- Remove the Old Belt: Slide the old, worn, or broken belt out of the pulleys carefully.
- Inspect Tensioner Components: Check the tensioner wheel, bearings, bushings, and spring. Replace any worn or damaged parts for optimal performance.
- Install New Belt: Feed the new belt into the pulleys as per the routing of the old belt, ensuring it seats properly into grooves.
- Release Tensioner: Slowly release the tensioner arm to apply tension to the new belt.
- Tighten Bolts and Reinstall Cover: Secure the tensioner bolts to the manufacturer's torque specifications and reinstall the belt cover.
- Reconnect Battery and Test: Reconnect the battery and run the machine to ensure the new belt operates smoothly without slipping or noise.
- Take photos or notes of the belt routing before removal to prevent errors.
- If replacing the tensioner arm or wheel, transfer any counterbalance weights carefully to the new parts.
- Regularly check belt condition to prevent unexpected failures; typical belt life varies depending on usage and environment.
- Refer to Komatsu’s official service manuals for detailed diagrams and torque specs.
- Belt Tensioner: Mechanism applying tension to the belt to prevent slipping.
- Torque Specification: The recommended tightness for bolts to ensure secure assembly without damage.
- Counterbalance Weight: A weight attached to tensioner arms to maintain proper tension and reduce vibration.
- Pulleys: Grooved wheels guiding and supporting the belt.
- Bushing: A wear-resistant liner reducing friction around pivot points.
A first-time Komatsu S175 owner hesitated before attempting a belt replacement, worried about the machine’s complexity. Following a detailed guide and carefully documenting each step, they successfully replaced a cracked belt and rejuvenated the machine’s performance. The satisfying result gave confidence to handle future maintenance tasks independently.
Summary List
- Disconnect battery and remove belt cover.
- Loosen tensioner bolts, lift tensioner arm.
- Remove old belt, inspect tensioner components.
- Install new belt, seat it properly in pulleys.
- Release tensioner arm and tighten bolts to spec.
- Reinstall cover, reconnect battery, test operation.
- Regular inspections and maintenance extend belt life.
