10 Excavator Noises You Should Never Ignore (And What They Could Be Telling You)
- RALPH COPE
- Aug 3
- 5 min read
Experienced excavator operators know their machines almost as well as they know their own vehicles.
They can tell when an engine is running smoothly. They know how the hydraulics should feel. They instinctively recognize when something "just doesn't sound right."
That instinct is worth listening to.
An excavator rarely suffers a catastrophic failure without first giving warning signs. More often than not, those warnings come in the form of unusual noises.
A faint whine. A metallic knock. A persistent squeal. A clicking sound that wasn't there yesterday.
Ignore these sounds, and a minor repair can quickly turn into a major breakdown.
At Vikfin, we've seen countless excavator components fail prematurely simply because the early warning signs were overlooked. In this article, we'll walk through ten common excavator noises, what they could mean, and why acting early could save you thousands of rand in repairs and weeks of costly downtime.
1. A Whining Noise from the Hydraulic Pump
If you hear a high-pitched whining or buzzing sound when operating the boom, stick or bucket, your hydraulic pump may be crying out for help.
Possible causes include:
Low hydraulic oil level
Blocked suction filter
Air entering the hydraulic system
Worn pump internals
Incorrect hydraulic oil
Hydraulic pumps rely on a constant supply of clean oil. When that supply is interrupted, cavitation can occur. Tiny air bubbles implode inside the pump, gradually damaging its internal components.
Left unchecked, a pump replacement could become unavoidable.
2. Knocking from the Engine
A heavy metallic knocking sound from the engine should never be ignored.
Potential causes include:
Worn bearings
Injector problems
Incorrect fuel timing
Low oil pressure
Internal engine wear
Engine repairs are among the most expensive repairs an excavator owner can face.
If you notice a knock developing, shut the machine down and investigate before further damage occurs.
3. Clicking While Travelling
Does one track produce a rhythmic clicking noise while moving?
Possible culprits include:
Worn sprockets
Damaged track links
Loose track shoes
Cracked rollers
Stones trapped in the undercarriage
Although the machine may continue operating, the problem generally worsens over time.
Routine inspections can often prevent a complete undercarriage failure.
4. Grinding When the House Rotates
A grinding or rumbling sound while slewing is never normal.
Possible causes include:
Worn slew bearing
Damaged slew motor
Contaminated gearbox oil
Gear tooth damage
Loose mounting bolts
Ignoring this noise can eventually lead to complete swing failure, resulting in expensive repairs and lengthy downtime.
5. Squealing Belts at Start-Up
A brief squeal during start-up is often caused by drive belts slipping.
Common reasons include:
Loose belt tension
Worn belts
Contaminated pulleys
Faulty tensioners
Fortunately, this is one of the simplest and least expensive problems to fix—provided it's dealt with early.
6. Hissing Around Hydraulic Hoses
A hissing sound accompanied by fine oil mist is often the first indication of a hydraulic leak.
Never run your hand over a suspected leak.
Hydraulic oil under pressure can penetrate the skin and cause serious injury.
Instead:
Stop the machine.
Release hydraulic pressure.
Inspect the hoses safely.
Replacing a damaged hose is far cheaper than replacing a hydraulic pump that has run dry.
7. Loud Bangs During Bucket Operation
If the bucket or boom makes loud clunking noises when changing direction, excessive wear may be developing.
Possible causes include:
Worn pins
Oval bushes
Cracked mounting points
Loose attachment bolts
These seemingly small components play a critical role in maintaining accurate digging geometry.
Replacing worn pins and bushes early can prevent structural damage to the boom or stick.
8. Popping or Cracking Sounds Around the Boom
This is one sound you should never ignore.
Cracking noises could indicate:
Fatigue cracks
Structural movement
Failing welds
Loose boom components
If cracks develop unnoticed, complete structural failure becomes a real possibility.
Stop operating the machine until a proper inspection has been carried out.
9. Continuous Track Squeal
Steel tracks naturally make noise.
However, excessive squealing can point to problems such as:
Tracks adjusted too tightly
Dry rollers
Worn idlers
Misaligned undercarriage
Correct track tension is critical.
Tracks that are too tight wear rapidly and increase strain on the final drives.
Tracks that are too loose risk derailing.
10. A Knocking Final Drive
One of the most expensive sounds an excavator owner can hear is a knocking or grinding noise from the final drive.
Possible causes include:
Bearing failure
Gear damage
Oil contamination
Water ingress
Low gearbox oil
Final drives often give plenty of warning before complete failure.
Ignoring those warnings can turn a repairable component into one that requires complete replacement.
Why Early Diagnosis Saves Money
Many excavator owners continue operating their machines because they believe:
"It still works."
Unfortunately, that mindset often leads to significantly larger repair bills.
Consider two scenarios:
Scenario A
A mechanic investigates a whining hydraulic pump and replaces a blocked suction filter.
Repair cost: Minimal.
Downtime: A few hours.
Scenario B
The operator ignores the whining noise for three weeks.
The pump fails completely.
Metal contamination spreads throughout the hydraulic system.
Repair cost: Tens of thousands of rand.
Downtime: Several weeks.
The difference? Listening to the machine.
Your Operators Are Your First Line of Defence
Operators spend hours in the cab every day.
They're often the first people to notice subtle changes in:
Engine sound
Hydraulic response
Swing performance
Travel speed
Vibration
Unusual smells
Warning lights
Encourage operators to report unusual noises immediately.
Creating a culture where small issues are investigated early can dramatically reduce maintenance costs over the life of your fleet.
Preventive Maintenance Pays for Itself
The best way to avoid expensive failures is through consistent preventive maintenance.
Simple habits include:
Checking hydraulic oil levels daily
Greasing all pivot points according to schedule
Inspecting hoses for wear or leaks
Monitoring track tension
Changing filters on time
Listening carefully during daily start-up
Investigating any new or unusual noise without delay
A few minutes of inspection each day can save days—or even weeks—of downtime later.
How Vikfin Helps Keep Machines Running
Even the best-maintained excavators eventually require replacement parts.
That's where Vikfin comes in.
We stock a wide range of quality refurbished OEM excavator components for leading brands including Caterpillar, Komatsu, Volvo, Hitachi, Doosan, JCB and Sumitomo.
Our inventory includes:
Final drives
Slew motors
Hydraulic cylinders
Valve banks
Engines
Radiators
Undercarriage components
Wiring harnesses
Buckets
Quick couplers
And many more essential parts
Because we dismantle excavators ourselves, we often have the components you need ready for immediate dispatch, helping you minimise costly downtime.
Final Thoughts
Excavators are remarkably tough machines—but they're also excellent communicators.
Long before a major failure occurs, they often try to tell you something is wrong.
The challenge is listening.
The next time you hear a whine, a knock, a click or a grind, don't turn up the radio and hope it disappears.
Investigate it.
A small repair today could prevent a catastrophic failure tomorrow.
And when you do need replacement parts, choose quality refurbished OEM components that deliver reliability, value and fast availability.
That's exactly what you'll find at Vikfin.
Listen to Your Excavator. Trust Vikfin.
If your machine is making a noise that doesn't sound right, don't wait for a complete breakdown.
Contact Vikfin today for expert advice and quality refurbished OEM excavator parts. Our knowledgeable team can help you diagnose common component failures and get your machine back to work quickly and affordably.
Vikfin – Flexible. Fast. Friendly. Affordable.
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