Category: Troubleshooting

Maintenance and management of the hydraulic system

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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 appropriate action to be quickly taken if required. The following values should be known for […]

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The actuator (cylinder) is not in working order

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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 bump at the load side. Perform the centering of the actuator and make the load […]

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The pressure control valve is not in working order

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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 the valve and seat. •Replace the worn or damaged parts. 2. The pressure oscillates (caused […]

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Excess heat is generated

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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 the actuator. 4. The sliding part of the pump is seized up (scoring). Repair or […]

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Pump produces noise (aeration)

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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 no baffle plate, or the reservoir is too small: install an defoaming filter or replace […]

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The pump produces noise (cavitation)

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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 the suction filter is insufficient. Replace the filter with a new one whose capacity is […]

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The pump does not discharge the working fluid

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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 in the suction line. Fix the pipe connection (screwed part and packing). 5. The working […]

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