9
Malfunctions and remedies
Gear units
Assembly and Operating Instructions – Explosion-Proof Gear Units
190
9.1
Gear units
Fault
Possible cause
Measure
Unusual, regular run-
ning noise
•
Meshing/grinding noise: Bearing
damage
•
Check oil consistency, change bearings
•
Knocking noise: Irregularity in the
gearing
•
Consult SEW‑EURODRIVE
•
Deformation of the housing upon
tightening
•
Check the gear unit mounting for pos-
sible deformation and correct if neces-
sary
•
Noise generated by insufficient
stiffness of the gear unit founda-
tion
•
Reinforce the gear unit foundation
Unusual, irregular run-
ning noises
•
Foreign objects in the oil
•
Check the oil consistency
•
Stop the drive, contact
SEW‑EURODRIVE
Oil leaking from inspec-
tion cover
•
Seal of the inspection cover leak-
ing
•
Tighten the screws of the inspection
cover and observe the gear unit. Con-
tact SEW‑EURODRIVE if oil is still
leaking.
•
Seal defective
•
Contact SEW‑EURODRIVE.
Small amounts of oil
leak from the oil seal
during run-in phase.
•
Function-related pseudo-leakage •
There is no fault. Remove with soft, lint-
free cloth and keep monitoring it.
Film of moisture around
the dust lip of the oil
seal
•
Function-related pseudo-leakage •
There is no fault. Remove with soft, lint-
free cloth and keep monitoring it.
Oil leaking from the oil
seal.
•
Oil seal leaking/defective
•
Check sealing system. It may be ne-
cessary to contact SEW‑EURODRIVE.
Oil leaking from motor
(e.g. terminal box or
fan)
•
Too much oil
•
Check oil level, correct if necessary
•
Gear unit not ventilated
•
Vent gear unit
•
Oil seal leaking/defective
•
Check sealing system. It may be ne-
cessary to contact SEW‑EURODRIVE.
Oil leaking from flange
•
Flange gasket leaking/defective
•
Check sealing system. It may be ne-
cessary to contact SEW‑EURODRIVE.
•
Too much oil
•
Check oil level, correct if necessary
•
Gear unit not ventilated
•
Vent gear unit
Oil leaking from
breather valve.
•
Too much oil.
•
Check oil quantity, correct if necessary
•
Function-related oil mist
•
There is no fault.
•
Drive not installed in proper
mounting position.
•
Install breather valve correctly and ad-
just the oil level.
•
Frequent cold starts (oil foaming)
and/or high oil level.
•
Install oil expansion tank.
Output shaft does not
turn although the motor
is running or the input
shaft is rotated.
•
Shaft-hub connection in the gear
unit interrupted.
•
Send in the gear unit/gearmotor for re-
pair
24804134/EN – 05/2018