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Replacing the Drive Belt on a Komatsu S175 Compact Track Loader
#1
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
  • 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
Steps to Replace the Drive Belt
  1. Battery and Safety: Disconnect the battery to avoid accidental startup.
  2. Remove Belt Cover: Detach the belt cover by removing the bolts. The cover usually slides off when bolts are removed.
  3. Locate the Belt Tensioner: The tensioner assembly keeps the belt tight and often includes two bolts for tension adjustment.
  4. 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.
  5. Lift the Tensioner: Using a ratchet or pry bar, lift the tensioner arm away from the belt groove to free the belt.
  6. Remove the Old Belt: Slide the old, worn, or broken belt out of the pulleys carefully.
  7. Inspect Tensioner Components: Check the tensioner wheel, bearings, bushings, and spring. Replace any worn or damaged parts for optimal performance.
  8. Install New Belt: Feed the new belt into the pulleys as per the routing of the old belt, ensuring it seats properly into grooves.
  9. Release Tensioner: Slowly release the tensioner arm to apply tension to the new belt.
  10. Tighten Bolts and Reinstall Cover: Secure the tensioner bolts to the manufacturer's torque specifications and reinstall the belt cover.
  11. Reconnect Battery and Test: Reconnect the battery and run the machine to ensure the new belt operates smoothly without slipping or noise.
Additional Tips
  • 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.
Terminology
  • 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.
Small Story
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.
With patience and care, replacing the Komatsu S175 drive belt is an achievable task that improves machine reliability and prevents costly downtime.
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