Common problems and solutions of hydraulic oil pumps
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Symptoms
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cause of issue
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troubleshooting
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No oil discharge (A)
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1、Wrong direction of rotation
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Immediately stop and correct the direction of the motor, if it is allowed to continue to rotate, it will burn the cause of damage
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2、Pump shaft does not rotate
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Repair the coupling and check if the key pins are off
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3、The pump shaft is broken and the rotor does not rotate
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Repair the pump, confirm the number of revolutions, whether the pressure is above the specified value, and whether the axis is aligned
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4、Suction pipe blocked
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Check the suction line
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5、Fuel tank filter clogged
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cleaning screening program
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6、Insufficient fuel tank filter capacity
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Replace the larger container, use more than 2 times the pump capacity
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7、The viscosity of the oil is too high
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Change the oil quality, set the heater
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8、Insufficient revolutions
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Driven at a specified number of revolutions
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9、Poor airtightness of the suction pipe
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Check the suction line
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10、Fuel tank screening program on top of the fuel tank
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Base line of fuel gauge
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11、The blades cannot slide out of the rotor bar
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Invasion of foreign matter, cleaning or repairing the pump
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Noisy (B)
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1、Small blockage of suction pipe
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The suction vacuum should be below 200m/mHg, and the height between the suction port and the hydraulic oil surface should be less than 1m
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2、Fuel tank filter clogged
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Cleaning and screening program
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3、Insufficient fuel tank screening program gauge
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Use a screening program (100um) that is more than twice the pump capacity
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4、oil viscosity is too high
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Replace the oil reservoir, set the heater, recommend ISOVG32 or 68 special hydraulic oil
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5、Suction pipe error in duplex pump
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repair piping
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6、Inhale air through the suction pipe
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Fill the heat absorbing tube with oil, find out the fault and repair it
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7、Air is sucked in from the opposite side of the pump shaft
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Check shaft alignment, or replace seals
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8、Inhale air from the pump
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Fill the pump with oil and find out the bad places
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9、air bubbles in the tank
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Check the configuration of the oil return pipe
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10、Oil level is too low
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The reference oil level for refueling, double pumps cannot use different oil tanks
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11、The blade cannot slide out of the rotor groove
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Clean or Repair the Pump
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12、Abnormal sound from the coupling
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The coupling is damaged and the shaft center is not well aligned. The maximum allowable misalignment should be less than 0.25mm. The maximum allowable angular error is less than 0.20. It is recommended to use a flexible coupling
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13、Fuel tank vent clogged or insufficient capacity
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Clean the vent or replace
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14、Exceeding the specified number of revolutions
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Check the cadence
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15、Exceeding the specified pressure
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check pressure gauge
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16、Bearing wear
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Repair the pump and confirm whether the axis is aligned
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17、Cam ring (stator) wear)
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Abnormal wear is caused by oil quality, water content in oil, oil viscosity and oil temperature during use.
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18、Poor pump cover tightening
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When assembling the pump, use a torque wrench to tighten it diagonally and progressively
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19、Damaged pump
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pump repair
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Insufficient oil (C)
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1、not ruled out
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Add hydraulic oil to baseline oil level
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2、Suction vacuum is too large, causing cavitation due to suction of air
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Refer to Item (A)
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3、cam-Ring
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Repair the pump and replace it with a new one
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4、Poor pump cover tightening
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Use a torque wrench for correct diagonal progressive tightening
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5、The viscosity of the oil is too low
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Replace the oil reservoir and install a cooler
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Oil leakage at the oil
seal (D)
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1、Broken wheel seal
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Exchange shaft seal
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2、internal oil leak
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Repair pumps, investigate oil viscosity
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