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Common Problems With SANY Excavators & How to Fix Them
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Common Problems With SANY Excavators & How To Fix Them | Xuzhou Jiemanda Construction Machinery Co . , Ltd.

Sep-28-2026
SANY excavators are known for their power, productivity, and value, and they are a common sight on construction sites around the world. But like any heavy machine that works long hours in harsh conditions, a SANY excavator can develop issues over time. Many of the most frequent problems are easy to diagnose — and several of them trace back to a faulty SANY sensor.
In this guide, we walk through the most common problems with SANY excavators, what causes them, and how to troubleshoot them so you can keep your machine running.

Electrical Problems and Fault Codes

Electrical faults are among the most common issues reported by excavator operators. Symptoms include warning lights on the dashboard, intermittent alarms, sudden shutdown, or error codes on the display panel.
Common causes include:
  • Loose or corroded wiring connections and connectors.
  • A weak or failing battery or alternator.
  • A damaged wiring harness, often from vibration or moisture.
  • A failing SANY sensor that sends an incorrect signal to the machine’s controller.
When a sensor reports values outside the normal range, the excavator’s electronic control unit often responds by limiting engine output or triggering an alarm — even if the mechanical components are perfectly fine. Diagnosing these codes correctly is the key to avoiding unnecessary part replacements.

Sensor Problems

Sensors play a central role in how a SANY excavator controls the engine, hydraulics, and safety systems. When something reads wrong, the whole machine can behave erratically.
Common SANY sensor failures include:
Sensor
Typical symptom when it fails
Engine speed / rpm sensor
Rough idle, power loss, erratic throttle response
Coolant temperature sensor
Incorrect temperature readings, overheating alarms, poor cold-start behavior
Oil pressure sensor
False low-pressure alarms, reduced engine protection
Hydraulic pressure sensor
Jerky or weak boom/arm movement, load-sensing errors
Fuel level / pressure sensor
Inaccurate fuel gauge, starting or fueling issues
Throttle / accelerator position sensor
Unresponsive or inconsistent engine speed control
Sensor faults are often caused by dirt, moisture, vibration, damaged wiring, or simple wear over time. Before replacing a SANY sensor, check the connector and wiring first — a poor connection can mimic a sensor failure.

Hydraulic System Problems

The hydraulic system does the heavy lifting on an excavator, and issues here show up quickly as loss of power or movement.
Common hydraulic problems include:
  • Slow or weak boom, arm, or bucket movement.
  • Jerky, uneven motion when operating the joystick.
  • Hydraulic oil leaks around cylinders, hoses, or fittings.
  • Overheating of the hydraulic oil under heavy load.
  • Contaminated or low hydraulic fluid.
Hydraulic symptoms are frequently caused by contaminated fluid, worn seals, clogged filters, or low oil levels. Keeping hydraulic oil clean and at the correct level is the single most effective way to prevent these problems.

Engine and Cooling Problems

Engine issues can range from minor to serious and are worth catching early.
Common symptoms include:
  • Excessive smoke from the exhaust (black, white, or blue).
  • Loss of power under load.
  • Overheating or rising coolant temperature.
  • Hard starting, especially in cold weather.
  • Unusual engine noise.
These can be traced to clogged air filters, dirty fuel, coolant leaks, worn belts, or a faulty cooling fan. When overheating warnings appear, check the coolant temperature sensor as well — a SANY sensor failure can produce a false alarm or hide a real one.

Electrical and Sensor Maintenance Tips

Many of the most common problems with SANY excavators can be prevented with straightforward maintenance:
  • Inspect wiring harnesses and connectors for corrosion and loose pins.
  • Keep sensors and their connectors clean and dry.
  • Replace filters and fluids on schedule.
  • Use genuine or correctly specified replacement parts.
  • Read and record error codes before resetting the system.
  • Test a suspected SANY sensor before replacing it to confirm the diagnosis.
A little preventive attention goes a long way toward avoiding costly downtime on the job site.

Frequently Asked Questions

Why does my SANY excavator show a warning light but run fine? The machine’s sensors may be reading an out-of-range value. Check the relevant sensor and its wiring before assuming a mechanical problem — a faulty SANY sensor or a loose connection is a common cause of false alarms.
Why is my excavator losing power under load? This can be caused by a clogged air or fuel filter, contaminated fuel, or a sensor reporting incorrect values to the engine controller. A diagnostic scan will usually point you in the right direction.
Why is the boom movement jerky? Jerky movement is often a hydraulic issue — contaminated fluid, air in the system, or a failing hydraulic pressure sensor. Check fluid condition and the related sensors together.
Should I replace a sensor as soon as it triggers a code? Not necessarily. First confirm the diagnosis: check the connector, wiring, and the sensor’s actual reading. Replacing a SANY sensor that was never faulty wastes money and leaves the real problem unsolved.

Get Help With SANY Excavator Parts and Sensors

Many of the common problems described above come down to a single failed component — and more often than not, it is a SANY sensor or a connected part that needs replacement. Using correctly specified, reliable components is essential to restoring performance and avoiding repeated breakdowns.
At XZJMD, we supply quality SANY sensor and excavator replacement parts, and we help equipment owners find the right components for their machines. If you are troubleshooting a fault and need a reliable source for parts, our team can assist. Contact us via our website: https://www.xzjmd.com/contact-us/.

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