One Tip to Extend Excavator Service Life: Chassis Maintenance

The excavator undercarriage is the foundation of reliable machine performance. As the most impact-exposed assembly in daily operation, poor maintenance often leads to disproportionately high repair costs. Industry data shows that undercarriage repairs can account for more than 50% of total equipment maintenance costs when maintenance is insufficient.

With proper routine care, you can significantly extend service life and reduce operating expenses.

1. Track Tension Inspection & Adjustment

Track tension is one of the most critical yet frequently overlooked maintenance items.

· Excessively tight: Creates stress on track bearings and bushings, accelerating wear and premature failure.

· Excessively loose: Increases derailment risk, causes abnormal wear, and reduces stability on uneven ground.

Procedure

· Inspect track tension every 50 operating hours.

· Maintain ideal track sag at 25–35 mm (follow your machine manual).

· Recheck tension immediately after operation in mud or sand.

· Perform adjustments on level ground with the engine off.

2. Undercarriage Cleaning (After Each Shift)

Mud, gravel, and debris act as abrasives, accelerating wear on pins, bushings, and track chains. Corrosion and premature failure follow quickly.

Maintenance Procedures:

· Wash the full undercarriage with moderate water pressure daily.

· Full cleaning is mandatory after operation in wetlands, swamps, or saline environments.

· Inspect for cracks, oil leaks, and loose track bolts during cleaning.

· Resolve abnormalities immediately to avoid major failures.

Tip: For machines working frequently in sand, salt, or heavy mud, perform a deep undercarriage wash weekly. Prevention costs far less than downtime.

3. Scheduled Lubrication

Inadequately lubricated joints wear exponentially faster. A structured lubrication plan is the most effective protection.

Intervals:

· Weekly: Lubricate all track pins and front idlers with lithium-based grease (per OEM specs).

· Every 500 hours: Lubricate the swing bearing to ensure smooth rotation.

· Every 250 hours: Check and top up oil levels in travel motors and final drives.

Important: Use only manufacturer-specified lubricants. Mixing incompatible products may cause chemical reactions, reduce performance, and void warranty.

4. Inspection of Sprockets, Idlers & Rollers

Early detection of wear prevents costly overhauls.

Warning Signs:

· Hooked or uneven sprocket teeth: Imminent track chain failure — replace sprockets promptly.

· Side-slip idler: Indicates failing idler bearings.

· Oil leakage at roller seals: Seal failure — repair immediately.

· Cracked or deformed track links: Compromised structural integrity — schedule replacement.

Schedule:

· Visual inspection every 100 hours or weekly.

· Detailed measurement every 500 hours.

· Maintain a maintenance log to track wear trends.

5. Long-Term Storage

Leaving the machine standing on tracks permanently deforms components and causes alignment issues.

Parking Best Practices:

· If stored longer than 2 weeks: Fully lift the machine off the ground to relieve track pressure.

· Cold climate: Idle 5–10 minutes to warm the hydraulic system before operation.

· After transport: Retorque all track bolts to specification.

· Monthly check: Hydraulic oil, battery (electric models), and overall condition.

Note: For storage over 1 month, refer to your service manual for fuel stabilization, coolant protection, and battery disconnection.

For service plans, genuine parts, and technical support for Yuchai equipment, our global team is ready to assist you.

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Website: www.yuchaicm.com