Possible malfunctions/remedy

Fault

Possible cause

Measure

Operating temperature too high

  • Too much oil
  • Check the oil level; correct if necessary
  • Oil too old
  • Check when the oil was last changed; change the oil, if necessary
  • Oil is heavily contaminated
  • Analyze the oil to determine the cause; take measures, if necessary; change the oil
  • Ambient temperature too high
  • Protect the gear unit from external heat sources (e.g. provide shade)
  • Gear units with fan: Air intake opening/gear unit housing contaminated
  • Check air intake openings, clean them if necessary; clean the gear unit housing
  • Malfunction of the oil-air or oil-water cooling system
  • Observe the separate operating instructions for the oil-water or oil-air cooling system
  • For gear units with built-in cooling: Cooling liquid flow rate too low; cooling liquid temperature too high; deposits in cooling system
  • Check the cooling liquid flow rate; check the entry temperature of the cooling liquid; clean the cooling system

Fault

Possible cause

Measure

Unusual, regular running noise

  • Meshing/grinding noise: Bearing damage
  • Check the oil consistency; change bearings
  • Knocking noise: Irregularity in the gearing
  • Contact SEW‑EURODRIVE. For a better assessment of the failure, send an audio recording of the noise
  • Deformation of the housing upon tightening
  • Check the gear unit mounting for possible deformation and correct if necessary
  • Noise generation caused by insufficient rigidity of the gear unit foundation
  • Reinforce the gear unit foundation

Fault

Possible cause

Measure

Unusual, irregular running noises

  • Foreign objects in the oil
  • Check the oil consistency
  • Stop the drive, contact SEW‑EURODRIVE

Fault

Possible cause

Measure

Unusual noise in the area where the gear unit is mounted

  • Gear unit mounting has loosened
  • Tighten retaining screws and nuts to the specified torque
  • Replace the damaged/defective retaining screws or nuts

Fault

Possible cause

Measure

Temperature at bearing points too high

  • Not enough oil
  • Check oil level; correct if necessary
  • Oil too old
  • Check when the oil was last changed; change the oil if necessary
  • Bearing damaged
  • Check the bearing and replace it if necessary. Contact SEW‑EURODRIVE

Fault

Possible cause

Measure

Oil leaking

  • From cover plate
  • From gear unit cover
  • From bearing cover
  • From mounting flange
  • Seal not tight at:
    • Cover plate
    • Gear unit cover
    • Bearing cover
    • Mounting flange
  • Tighten the bolts on the respective cover. Observe the gear unit. Contact SEW‑EURODRIVE if oil is still leaking

Fault

Possible cause

Measure

Oil leakingDuring the run-in phase (24-hour runtime), it is normal for (small amounts of) oil/grease to leak from the oil seal (see also DIN 3761).

  • From oil seal
  • Too much oil
  • Check the oil level and correct, if necessary
  • Venting sealed
  • Check the venting and replace the breather if necessary
  • Oil seal damaged/worn
  • Check the oil seals and replace if necessary

Fault

Possible cause

Measure

Oil leaking

  • At the gear unit breather
  • Too much oil
  • Check oil level, correct if necessary
  • Drive not installed in proper mounting position
  • Install gear unit breather correctly and adjust the oil level
  • Frequent cold starts (oil foaming) and/or high oil level
  • Install oil expansion tank

Fault

Possible cause

Measure

Oil leaking

  • From the screw plug
  • From the oil drain valve
  • Gasket not tight
  • Retighten screw
  • Fittings loosened
  • Retighten the fitting and screw. Secure screw fitting with Loctite®

Fault

Possible cause

Measure

Severe V-belt wear

  • Inadequate alignment of the V-belt pulleys
  • Check the alignment of the V-belt pulley and the belt pretension.
  • Harmful ambient conditions (e.g. abrasive particles, chemical substances)
  • Protect the belt drive from environmental influences, but also ensure sufficient ventilation.
  • Overload of the belt drive
  • Replace the V-belt if necessary; contact SEW‑EURODRIVE

Fault

Possible cause

Measure

No oil pump suction

  • Air in the suction line of the oil pump
  • Fill oil into the suction line and the oil pump, vent the pump at the pressure side
  • Oil pump defective
  • Consult SEW‑EURODRIVE

Fault

Possible cause

Measure

Pressure switch not switching

  • Air in the suction line of the oil pump
  • Fill suction pipe and oil pump with oil
  • Vent the pump at the pressure side
  • Pressure switch connected incorrectly
  • Check the connection
  • Pressure switch defective
  • Replace pressure switch
  • Oil pump defective
  • Contact SEW‑EURODRIVE

Fault

Possible cause

Measure

Malfunction in the oil-water or oil-air cooling system

  • Malfunction of the oil-water or oil-air cooling system
  • Observe the separate operating instructions for the oil-water or oil-air cooling system

Fault

Possible cause

Measure

Gear unit does not reach cold start temperature

  • Thermostat set incorrectly
  • Check the setting of the thermostat
  • Oil heater faulty or connected incorrectly
  • Check if the oil heater is connected and working correctly and replace it if necessary
  • Heat dissipation too great due to unfavorable climatic conditions
  • Prevent the gear unit from cooling off during the warm-up phase

Fault

Possible cause

Measure

Operating temperature at backstop too high, no blocking function

  • Damaged/defective backstop
  • Check the backstop, replace it if necessary
  • Contact SEW‑EURODRIVE