Hidromek · Construction Machine · EGR Fault Solution

Hidromek HMK 310 LC EGR Fault Solution

We solve power loss, black smoke and warning-light problems caused by the EGR valve and EGR cooler on Hidromek HMK 310 LC construction machines with ECU software. The cause of the fault is diagnosed first and the original software is backed up.

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ECU software work on a Scania truck and a Doosan excavator in the workshop

On construction machines the engine runs for long hours at constant rpm and often under light load; the EGR circuit soots up quickly in these conditions. The symptoms are slower hydraulic response, rpm drop under load and higher fuel consumption.

The EGR system returns part of the exhaust gas to the intake. That gas carries soot; over time the valve, the cooler and the intake manifold become coated with it. When the valve sticks the engine cannot draw clean air: power drops, smoke increases, idle becomes unstable and the ECU stores a fault.

When the EGR cooler is perforated, coolant passes to the exhaust side and the engine starts losing coolant; in that case software alone is not the answer and the cooler has to be bypassed or replaced. We tell you which job is right after diagnosis.

When is it needed?

EGR valve fault and soot build-up
Rough idle, smoke, power loss
Carbon build-up in the intake manifold

Typical duration: 1–2 hours

This page covers these versions of the Hidromek HMK 310 LC range: HMK 310 LC.

EGR Fault Solution on other Hidromek models

Hidromek HMK 102B Hidromek HMK 102S Hidromek HMK 220LC Hidromek HMK 230LC Hidromek HMK 300LC Hidromek HMK 370LC Hidromek HMK 640WL Hidromek HMK 140 LC Hidromek HMK 210 LC Hidromek HMK 360 LC

EGR Fault Solution for other makes

Aebi Schmidt JCB Bobcat Manitou Zoomlion Albach XCMG Doosan Hitachi Komatsu Sunward Terex

Send us this for a quick diagnosis

If you include the following when you message us on WhatsApp, we can confirm compatibility and the work needed the same day.

Make, model and model year
A photo of the dashboard warning or the fault code
A photo of the engine ECU label
When the fault started and what has been done so far
For on-site service: province, district and location

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Frequently asked questions

What are the symptoms of a Hidromek HMK 310 LC EGR fault?

Loss of power and pulling ability, black smoke under heavy load, unstable idle, higher fuel consumption and the engine warning light are the most common symptoms. With a cooler fault, coolant loss is added to these.

Does an EGR fault affect the DPF?

Yes. A stuck EGR valve upsets combustion and increases soot production; the particulate filter fills much faster than normal. That is why the two systems are assessed together.

How long does the job take?

Most ECUs are read and written through the diagnostic socket and the job is completed the same day. Some units are removed and worked on the bench.

Can the original software be restored?

Yes. The original ECU software is backed up and archived before the job; the factory setting can be restored on request.

Does the EGR job give the machine more power?

The EGR job is not a power remap; no power gain should be expected from it alone. Because the loss of pull and the power reduction caused by a faulty EGR disappear, the machine returns to its factory output. If more power is wanted, a power remap is applied separately.

The machine is losing coolant. Could it be related to the EGR?

It could. When the EGR cooler leaks internally, coolant passes to the exhaust side; coolant drops without any visible leak and white smoke may come from the exhaust. This is a mechanical fault and software does not fix it; the cooler is repaired or replaced. The software solution is for EGR faults caused by the valve and sensors.