🔧 What is a Tensioner in a Volvo Excavator?
A tensioner in a Volvo excavator is a component that maintains proper tension on either the track chain (undercarriage) or engine drive belts. It ensures that the relevant system runs smoothly and efficiently, without slack or excessive wear.
There are two main types of tensioners in Volvo excavators:
✅ 1. Track Adjuster / Track Tensioner (Undercarriage)
📌 Function:
- Maintains proper tension on the rubber or steel tracks.
- Prevents track sagging, derailment, or excessive wear.
- Uses a grease cylinder and spring mechanism to push the idler forward and tighten the track.
⚠️ Signs of a Worn or Faulty Track Tensioner:
- Tracks keep slipping or derailing
- Visible sag in the track
- Uneven track wear
- Excessive noise or vibration during travel
🛠️ Maintenance Tip:
- Adjust tension regularly using the grease fitting.
- Clean mud and debris from the idler and track adjuster area to avoid pressure build-up.
✅ 2. Belt Tensioner (Engine Compartment)
📌 Function:
- Keeps the correct tension on engine drive belts (for alternator, A/C compressor, fan, etc.).
- Ensures belts don’t slip or break during engine operation.
- Usually spring-loaded or hydraulic, with an automatic or manual adjustment system.
⚠️ Signs of a Faulty Belt Tensioner:
- Squealing or chirping noise from engine belts
- Belt slipping or falling off
- Overheating (if water pump belt is affected)
- Weak alternator output or poor A/C performance
🛠️ Maintenance Tip:
- Inspect tensioner and belt for cracks or wear every 500 hours.
- Replace both tensioner and belt together when worn.
🔍 Genuine Volvo Tensioners:
Always use OEM Volvo parts for replacements, especially for models like:
- Volvo EC210
- Volvo EC290
- Volvo EC360
- Volvo EC480
Using aftermarket or incorrect tensioners may lead to premature wear, machine downtime, or safety hazards.
✅ Summary:
| Tensioner Type | System | Purpose |
|---|---|---|
| Track Adjuster | Undercarriage | Maintains track tension |
| Belt Tensioner | Engine compartment | Keeps engine belts tight and functional |
