Rexroth Hydraulic Pumps – Routine maintenance and troubleshooting of gear pumps

1. Daily maintenance

1) Strictly implement the post operation method and carefully fill in the operation records.

2) Check the bearing temperature and oil pressure regularly; Check the level height of the lubricating oil every shift.

3) Check whether there is leakage in the sealing part once per shift.

4) Do a good job of tidying up the equipment in each shift.

2. Check the content regularly

1) Regularly monitor the vibration condition of the bearing.

2) Analyze the quality of lubricating oil once a month to check whether the viscosity, moisture and impurities of the oil meet the requirements.

Two. Common troubleshooting and handling

1. Fault phenomenon

Insufficient flow or pressure

cause

1) The inhalation height is not enough;

2) There is air leakage in the pump body or inlet pipe;

3) The inlet pipeline or filter is blocked;

4) High viscosity of liquid;

5) The axial clearance of the gear is too large;

6) The radial clearance of the gear or the tooth side clearance is too large.

How to deal with it

1) Increase the liquid level;

2) Replace the gasket, tighten the bolts, and repair the pipeline;

3) Cleanup;

4) Liquid heating;

5) Adjustment;

6) Adjust the clearance or replace the pump casing and gear.

2. Fault phenomenon

The motor is overloaded

cause

1) The viscosity of the liquid is too large;

2) Debris in the pump body;

3) shaft bending;

4) The packing is too tight;

5) Different shafts of couplings;

6) The ammeter is faulty;

7) The pressure is too high or the resistance of the pipeline is too large.

How to deal with it

1) Heating;

2) Check the filter to eliminate debris;

3) Replacement;

4) Adjustment;

5) Alignment;

6) repair or replacement;

7) Adjust the pressure and dredge.

3. Fault phenomenon

Leakage at the packing of the pipeline

cause

1) Shaft bending;

2) Wear of the shaft journal;

3) The bearing clearance is too large, and the gear vibrates violently;

4) The filler material does not meet the requirements;

5) Loose packing gland;

6) Improper installation of filler;

7) Failure of the sealing ring.

How to deal with it

1) Adjustment or replacement;

2) repair or replacement;

3) Replacement of bearings;

4) Re-select the filler;

5) Fastening;

6) Correction;

7) Replacement.

4. Fault phenomenon

The pump body is overheated

cause

1) The oil temperature is too high;

2) The bearing clearance is too small or too large;

3) The radial, axial and tooth side clearance of the gear is too large;

4) The packing is too tight;

5) The outlet valve is too small to open and the pressure is too high;

6) Poor lubrication.

How to deal with it

1) Cooling;

2) Adjust the gap;

3) adjustment or replacement;

4) Adjustment;

5) Open the large outlet valve to reduce the pressure;

6) Replace the grease.

5. Fault phenomenon

Vibrating or making noise

cause

1) The liquid level is low, and the liquid cannot be sucked up;

2) The bearing wear clearance is too large;

3) The driving gear and driven gear shafts are not parallel, and the driving gear shaft is different from the motor shaft;

4) Shaft bending;

5) Debris in the pump;

6) Gear wear;

7) The keyway is loose or broken;

8) Loose anchor bolts;

9) Inhale air.

How to deal with it

1) Increase the liquid level;

2) Replacement of bearings;

3) Alignment;

4) Replacement;

5) Clean up debris and check filters;

6) repair or replacement;

7) Repair or replacement;

8) Fastening;

9) Eliminate air leakage.

6. Fault phenomenon

The pump does not discharge

cause

1) The direction of rotation is opposite;

2) Suction or discharge valve closed;

3) There is no material at the inlet or the pressure is too low;

4) The viscosity is too high, and the pump cannot bite the material.

How to deal with it

1) Confirm the direction of rotation;

2) Confirm whether the valve is closed;

3) Check the valve and pressure gauge;

4) Check the viscosity of the liquid.

Rexroth Hydraulic Pumps – Routine maintenance and troubleshooting of gear pumps

Rexroth Hydraulic Pumps – Routine maintenance and troubleshooting of gear pumps

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