Track detachment is a common issue in small excavators, especially for older units. The key to effective prevention lies in adjusting track tension based on working conditions. Here's a concise guide to solutions:

1. Two Main Causes of Track Fall-off

1. Excessive Tension

• Increases walking resistance, reduces efficiency, and accelerates pin-bushing wear.

• Concentrates stress on drive sprocket and track engagement, damaging teeth.

2. Insufficient Tension

• When track sag exceeds 3cm, it rubs against the frame, causing damage.

• Prone to derailment during complex movements (climbing/turning), increasing chain plate fracture risks.

2. 3-Step Preventive Maintenance

2.1 Regular Tension Inspection

• Park the excavator on hard ground, stop the engine.

• Push the middle of the track; standard sag should be 3–5cm for small excavators, 2–4cm for mini models.

• Adjust via the grease nipple on the tension cylinder; rotate the track twice after each grease application before re-measuring.

2.2  Condition-Based Adjustment Strategies

• Rocky terrain: Loosen by 10%–15% to reduce track plate bending.

• Hard flat ground: Tighten by 5%–10% to prevent sagging and frame rubbing.

• Soft/muddy ground: Loosen to the lower limit of standards to avoid mud jamming in chain links.

• Frequent climbing: Maintain standard tension to balance driving force and chain lifespan.

2.3  Timely Wear Parts Replacement

• Replace chain links if wear exceeds 2mm or bushing clearance >1.5mm.

• Repair guide/idler wheels within 48 hours if unusual noises occur.

3. Emergency Steps for Track Detachment

1. Stop operation immediately, set up a 5m warning zone.

2. Use the bucket to support the machine, suspending the detached track side.

3. Manually rotate the drive sprocket to align with track grooves, then lower the machine slowly.

4. Recheck tension before starting; run idle for 5 minutes to ensure no abnormal sounds.

4. 3 Tips to Extend Track Life

• Daily: Remove mud from chain links, blow out guide wheel grooves with compressed air.

• Every 20 hours: Lubricate tension cylinder joints with lithium-based grease.

• Operation: Avoid sharp turns (especially under load); limit climbing angles to <25°.

Conclusion

Track fall-off mostly results from poor maintenance. Spending 5 minutes adjusting tension before work can reduce derailment risks by 80%. Focus on tension adaptation to working conditions and timely wear part replacement to keep your excavator operating stably!