What are the faults in the control circuit of the EQ1140G diesel vehicle exhaust brake? How to rule out?

The EQ1140G diesel vehicle exhaust brake is a circuit that controls the exhaust valve to open and close the exhaust line to achieve exhaust brake or release brake.

A clutch switch for accelerating the switch is provided in the control circuit. When the driver depresses the accelerator pedal or steps on the pedal, the exhaust brake is automatically released to avoid forgetting to release the exhaust brake due to the driver's negligence.

Symptom: The exhaust brake solenoid valve does not work.

Fault check:

(1) Firstly, open the exhaust brake switch. If the indicator light is not high, check whether the power fuse is in good condition. If the indicator light is on, the power supply is not faulty.

(2) Open the exhaust brake switch to make the exhaust brake work, check the accelerator pedal first, because the accelerator pedal switch is the grounding point of the entire electrical control system, so unplug the wire on the accelerator pedal switch, If the exhaust brake is active, it indicates that the accelerator switch is not properly adjusted or damaged. If the accelerator pedal switch is intact, check the clutch switch. Gently press the clutch pedal, can hear the clutch switch to open or close the sound, such as check the clutch pedal because of the return spring damage or improper adjustment, will directly affect the normal work of the exhaust brake.

(3) Check the voltage across the solenoid valve. If there is no voltage, it indicates that there is a fault in the clutch circuit. If there is voltage, remove the grounding plug of the solenoid valve and remove the ground. If the solenoid valve does not work, the solenoid valve is damaged.

Troubleshooting: Replace damaged electrical components and adjust working stroke.
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For KOMAISU Cylinder Seal Kit

Precautions for installation of hydraulic cylinder sealing kit

1.Before installation, carefully check whether the model and specifications of the sealing kit match the hydraulic cylinder, and whether there is any damage or deformation.

2.Before installing the sealing kit, the interior of the hydraulic cylinder should be cleaned thoroughly and checked for foreign objects, sand particles, and other impurities to avoid affecting the sealing effect.

3.When installing the sealing kit, special tools should be used to avoid using hard metal tools or manual tools to avoid damaging the sealing kit.

4.When installing sealing kits, attention should be paid to the direction and position to ensure that each sealing kit is installed correctly to avoid leakage or poor sealing.

5.When installing the sealing kit, attention should be paid to applying lubricating oil or lubricant to make it easier to install and improve the sealing effect.

6.After installing the sealing kit, pressure testing and running should be carried out to ensure the sealing effect and the normal operation of the hydraulic system.


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