Category Archives for Troubleshooting
Maintenance and management of the hydraulic system
Perform the following actions for maintenance and management of the hydraulic system. 1. Keep the working fluid clean (see Chapter 14 HYDRAULIC FLUIDS). 2. Make sure that operating conditions are correct, and keep the system in an order that allows … Continue reading
The actuator (cylinder) is not in working order
1. Knocking is caused by air in the working fluid. Remove the air from the fluid. 2. Knocking is caused by packing resistance. Apply molybdenum disulfide coating to the piston or replace the packing. 3. Knocking is caused by the … Continue reading
The pressure control valve is not in working order
1. The pressure falls below the setting level. a. The valve is not properly seated. b. The orifice is clogged with dust. c. Stick-slip is taking place because of dust. d. The valve spring is damaged. •Overhaul the valve. •Replace … Continue reading
The solenoid directional valve is not in working order (burnout of the coil)
1. Spool operation is failed because of dust. Clean the spool and replace the coil. 2. The voltage is too high or low. Set the voltage at a proper level and replace the coil. 3. Insulation failure is caused by … Continue reading
Excess heat is generated
1. Internal leakage in the pump increases. Repair or replace the pump because its volumetric efficiency is deteriorated. 2. Internal leakage in the valve increases. Repair or replace the valve. 3. Internal leakage in the actuator increases. Repair or replace … Continue reading
Pump produces noise (aeration)
1. Suction pipe connection is loose. Fix the connection (screwed part and packing). 2. There are foams in the reservoir. 1. The oil level is low: add the working fluid to the recommended level. 2. The reservoir is equipped with … Continue reading
The pump produces noise (cavitation)
1. The suction line or the suction filter is clogged. Remove the clogging. 2. The suction line is too narrow or long. Replace the piping so that the vacuum level is kept below the specified value. 3. The capacity of … Continue reading
The pump does not discharge the working fluid
1. The rotation direction is incorrect. Make sure that the direction is correct. 2. The pump shaft is not rotating. Check and modify the shaft key and coupling. 3. The suction filter is clogged. Remove the clogging. 4. Air is … Continue reading