How to Check the Hydraulic System in a Used Excavator

How to Check the Hydraulic System in a Used Excavator

by Sam from Dige International Trading

When buying a used excavator, one of the most important systems to inspect is the hydraulic system. It controls the arm, boom, bucket, and even the movement of the entire machine. In the used excavator market, a strong and leak-free hydraulic system is often the difference between a good deal and a costly repair. At Dige International Trading, we help buyers around the world assess hydraulic health before they commit to any purchase.

Why Hydraulic Systems Matter

The hydraulic system powers nearly every function in an excavator. A weak pump, cracked hose, or worn cylinder can reduce performance or cause complete failure. Used machines may have hidden wear that only shows under pressure—so inspection is key.

Hydraulic issues are also among the most expensive to repair. That’s why checking these systems is essential when evaluating any used excavator.

What to Inspect in a Used Excavator’s Hydraulic System

Here’s a step-by-step checklist we follow at Dige:

1. Visual Inspection

   
   

   • Look for oil leaks around cylinders, hoses, and connectors.

   • Check for cracked or bulging hoses.

   • Inspect hydraulic fluid in the tank—it should be clean and clear.

   
   

2. Functional Test

   
   

   • Operate the boom, arm, and bucket at full extension.

   • Watch for slow movement, jerking, or uneven pressure.

   • Listen for abnormal noise from the pump during operation.

   
   

3. Pressure Test (If Available)

   
   

   • Use a pressure gauge to verify system pressure matches factory specs.

   • Uneven pressure may indicate internal leakage or a failing pump.

   
   

4. Check for Warning Lights or Error Codes

   
   

   • Modern used excavators may display hydraulic system alerts on the dashboard.

   
   

Common Red Flags

When evaluating a used excavator, beware of:

• Fresh oil around cylinder seals (may be hiding a leak)

• Discoloration in hydraulic oil (suggests contamination)

• Stiff or unresponsive controls

• Any history of major hydraulic repairs without documentation

At Dige International Trading, our technicians perform full hydraulic checks on every excavator before export. We also share videos of the boom, swing, and bucket in operation so you can see performance for yourself.

Final Tips Before You Buy

• Always request recent photos and operational videos.

• Ask for details on the last hydraulic service or fluid change.

• Work with an exporter who understands excavator diagnostics and can provide honest evaluations.

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