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Excavator problems can turn a productive job site into an expensive standstill within minutes. Most operators only notice something is wrong once the machine is already struggling.
Whether your excavator will not start, feels weak under load, or is making an unfamiliar sound, catching the cause early usually means a cheaper, faster fix.
This guide helps you discover 12 most common excavator problems, what causes each one, and how to fix or prevent it, drawing on decades of servicing earthmoving equipment across Perth and WA.
And if repairs start outweighing what your excavator is worth, we will show you when it is time to look at new excavators for sale instead.
12 Most Common Excavator Problems & How to Fix Them
1- Why Won’t My Excavator Start?
A dead or corroded battery, damaged wiring, or a failing starter motor cause most excavator starting problems, along with dirty fuel filters or air trapped in the fuel line during colder months.
How to fix it:
Clean and tighten the battery terminals, test under load, and bleed the fuel system if the tank ran dry. Most starting faults cost under two hundred dollars, but a machine that still will not crank needs a starter motor or wiring diagnosis from a technician.
2- Why Is My Excavator Losing Power or Running Poorly?
Power loss is normally associated with clogging of the air filter, dirty fuel or worn injectors causing poor combustion. Insufficient engine oil will cause the engine to run hard and produce low power output.
How to fix it:
Replace air and fuel filters on schedule, use clean fuel, and keep engine oil topped up. If power loss continues after fresh filters, have injectors and compression tested before it leads to a full engine rebuild.
3- Why Is My Excavator Overheating?
Overheating is usually caused by low coolant, a blocked radiator, or a failing thermostat that stops heat escaping the cooling system. Dust and mud packed around the radiator fins is a common issue on WA sites through summer.
How to fix it:
Check coolant levels when cold, clean radiator debris regularly, and replace a faulty thermostat promptly. Running an overheating excavator risks warping the cylinder head, turning a cheap fix into a major repair.
4- Why Are My Excavator Hydraulics Slow, Weak or Jerky?
Hydraulic system’s slow or erratic operation is mostly caused by lack or contamination of hydraulic oil, blocked filters, or worn pumps and valves that reduce pressure. Additionally, air trapped in the hydraulic line can also result in erratic movements.
How to fix it:
Test fluid levels and quality, change filters regularly, and drain air if present in the system. A worn hydraulic pump is a bigger job and should be assessed by a technician before it fails completely.
5- Why Is Hydraulic Fluid Leaking from My Excavator?
This one of the most common excavator hydraulic problems. Leaks usually come from worn seals, damaged hoses, loose fittings, or a cracked hydraulic cylinder. Even a small leak can quickly reduce pressure across the machine.
How to fix it:
Identify the source with the machine off and pressure released, then replace the seal, hose or fitting rather than topping up fluid. Never inspect a suspected leak with bare hands while the system is pressurised.
6- Why Are My Excavator’s Tracks and Undercarriage Wearing or Malfunctioning?
Incorrect track tension is another frequent excavator issue. Tension that is too high causes stress on the rollers, idlers, and sprockets; while tracks with low tension allow the undercarriage to sag and cause wear of pins and bushings. Any unevenness of movement or grinding could be a symptom of failing final drive.
How to fix it:
Regularly check and maintain track tension and keep the undercarriage clean from dirt. Grinding or leaking from the final drive needs a technician promptly, since it is one of the most expensive undercarriage repairs if ignored.
7- Why Does My Excavator Have Electrical or Wiring Problems?
Blown fuses, corroded connectors, and a failing alternator or charging system usually cause flickering controls, dead gauges, or an excavator that will not hold charge.
How to fix it:
Inspect fuses and battery connections. Clean or replace the loose or damaged ones. Any recurring electrical problems, particularly those related to control or safety systems, should always be referred to a professional.
8- Why Isn’t My Excavator’s Bucket, Boom or Arm Moving Properly?
Weak, slow or unresponsive bucket, boom and arm movement is usually caused by a leaking hydraulic cylinder, worn bucket pins and bushings, or worn cylinder seals. A boom that drifts down on its own points to cylinder leakage.
How to fix it:
Grease bucket pins and bushings on schedule, and replace worn seals as soon as leaking starts. Left unchecked, this leads to misalignment that affects digging accuracy.
9- Why Is My Excavator Using Too Much Fuel?
Rising fuel consumption usually means the engine is working harder than it should, most often due to a clogged air filter, faulty injectors, or old fuel filters.
How to fix it:
Replace the air filter and fuel filters on schedule, and have injectors inspected if fuel use keeps climbing. A well-maintained excavator burns noticeably less fuel over its life.
10- Why Is My Excavator Making Unusual Noises or Vibrating?
Grinding, whining, knocking or squealing noises usually mean worn bearings, loose components, or a developing hydraulic or engine fault, and should never be ignored, since noise is often the earliest warning sign before a breakdown.
How to fix it:
Identify where the noise is coming from, tighten loose bolts, and replace worn bearings before they fail completely. If you cannot isolate the source, a proper machine inspection saves you from guessing.
11- Why Is My Excavator Producing Excessive or Coloured Exhaust Smoke?
The colour of the smoke tells you what is wrong. Black smoke points to a dirty air filter or faulty injectors, white smoke suggests unburned fuel or a head gasket issue, and blue smoke means the engine is burning oil, often from worn piston rings.
How to fix it:
Replace the air filter and check injectors for black smoke, and have compression tested for white or blue smoke. Coloured smoke is rarely cosmetic, it is usually the clearest early signal of an engine problem.
12- What Do Warning Lights or Emission System Faults Mean on My Excavator?
Amber warning lights mean a service is needed soon, while red or flashing lights mean stop operating and get the machine inspected. On newer excavators, a blocked diesel particulate filter or DEF fault also triggers a warning and reduces performance.
How to fix it:
Never ignore a red or flashing light, and check your operator manual for what each code means on your model. For DPF or emission faults, a forced regeneration or diagnostic scan usually resolves it before it becomes a bigger repair.
Most of these excavator problems share the same root cause: skipped inspections and delayed servicing. A simple excavator maintenance checklist covering fluid levels, filters, track tension and wear parts before every shift prevents most of the issues above.
Quick Excavator Troubleshooting Tips
Most excavator problems come from the same root cause: skipped inspections and delayed servicing. Run through this quick checklist before every shift, or before calling a technician:
- Check engine oil, coolant and hydraulic oil levels
- Inspect air, fuel and hydraulic filters for blockages or wear
- Check and adjust track tension, and clear debris from the undercarriage
- Look for fluid leaks, loose bolts or damaged hoses
- Listen for unusual noises during startup and operation
- Check dashboard warning lights before continuing work
Are recurring excavator problems, rising repair costs and costly downtime starting to affect your operations?
Keep Your Digger Working or Find the Right Excavator for Sale at Worldwide Construction Machinery
With more than 40 years of industry experience, Worldwide Construction Machinery understands how important reliable heavy machinery is to your operation.
Our servicing division provides routine heavy equipment maintenance and servicing, diagnostic services, component replacement, repairs, overhauls and emergency breakdown support to help keep your equipment operating reliably.
If an ageing machine is becoming too costly to maintain, we also offer a wide range of new and used excavators for sale, including options for businesses looking for new and used construction equipment in Perth.
FAQs
1- What are the most common problems with excavators?
Common excavator errors include failure to start, hydraulic problems, overheating, undercarriage wear and electrical faults. These are often caused by poor maintenance or worn-out parts.
2- What are the signs that an excavator needs repair?
Signs your excavator needs repair include odd noises, fluid leaks, overheating, lack of power, slow hydraulics, excessive smoke, warning lights and repeated track issues.
3- How much does excavator servicing cost in Perth?
Mini excavator servicing in Perth costs $1,000 to $3,000+ per year and bigger excavator servicing can be over $10,000 per year, depending on size, condition and usage.
4- What causes an excavator to lose hydraulic pressure?
An excavator might lose hydraulic pressure from low or dirty hydraulic fluid, worn pumps, dirty filters and leaks in hoses, valves, seals or hydraulic cylinders.
5- Is it cheaper to repair or replace an old excavator?
Replacement can be a cheaper option than repairs if an excavator breaks down frequently, costs too much to repair, and spends too much time being repaired.
6- How often should excavator hydraulic fluid be checked?
Check the hydraulic fluid in the excavator daily before work and replace the hydraulic fluid at the manufacturer-specified service intervals.