Valvescan also fail to close at times. This can be due to a manual override, pressuredifference, residual coil power, damaged armature tube, inverted or damagedvalve seats, and some missing components. Be sure you thoroughly check yourwiring, lead connections, components, and diaphragm to see what the specificissue is. You can also try to lift the coil slightly to check if anelectromagnetic field is present. If ever you have an inverted diaphragm, itwould be wise to refit the item correctly before replacing it with a newone.

3. Erratic Valve Sounds

Every time a valve closes or opens up, you may hear a disturbing hammeringsound, or in other cases, there can be a buzzing sound heard upon the operationof solenoid valves. These errant valve sounds can be due to the difference inthe inlet or outlet pressure inside the system. Water hammering upon valveopening can be due to high liquid pressure traveling through a small pipe bore.Installation of a T-piece pipe before the air can help dampen the noise andreduce the impact. You may also increase the dimensions of your pipe to reducethe speed of your liquid components. Increasing pipe size would be a nice wayto reduce inlet pressure on the valves as well.

4.Coil Problems

The coil may be burned, melted, or can stay cold even with power on. These coilproblems can be caused by short circuit, slow coil armature, wrong voltage, andhigh media (gases, liquids, etc) temperatures.

To avoid erroneous voltage supply, be sure to check the compatibility of yourcoil with the power supply. Check for moisture within and replace if necessary.Replace any damaged or bent armatures as well, and check media compatibilitywith your valve. Don’t forget to move solenoid valves into cooler areas or youmay increase ventilation around valves and coil.

111-9916 1119916 VALVE GROUP SOLENOIDApplicable To Excavator E320B E320C E320D E325C E325D E330D AFTERMARKETREPLACEMENT EXCAVATOR PARTS

Part No.: 111-9916

Ref. No.: Yellow Dot KDRD5K-31/40E30

Model:HTD4019-12V