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Faults, causes and remedies
Faults
Oil escapes.
Oil leak at the gear‐
box vent.
Gearbox over‐
heats.
Output shaft does
not turn when the
motor is running.
Geared motor only
starts with difficul‐
ty or not at all.
Excessive play at
drive input and out‐
put.
50
Causes
Incorrect oil level for the mounting posi‐
tion being used.
Gearbox leaks.
Overpressure due to lack of venting.
Overpressure due to soiled venting.
Shaft sealing rings defective.
Cover / flange bolts loose.
Surface sealing defective (e.g. on cover,
flange).
Damage in transit (e.g. hairline cracks). Check the gearbox for damage in transit.
Incorrect oil level for the mounting posi‐
tion used and / or incorrect venting po‐
sition.
Frequent cold starts during which the oil
foams up.
Motor fan cover and / or gearbox very
dirty.
Incorrect oil level for the mounting posi‐
tion being used.
Incorrect oil being used (e.g. incorrect
viscosity).
Oil is too old.
Excessive bearing play and / or bearing
defective.
Force flow interrupted by breakage in
gearbox.
Incorrect oil level for the mounting posi‐
tion being used.
Incorrect oil being used (e.g. incorrect
viscosity).
Excessive external load on the drive in‐
put and output.
Motor brake is not released.
Geared motor runs against backstop.
Flexible elements worn (e.g. on cou‐
plings).
Positive connection disrupted by over‐
load.
Remedy
Check the mounting position (Page 76)
and the oil level (Page 54).
Checking the gearbox for leaks
(Page 65).
Mount the venting as appropriate for
the mounting position (Page 76).
Clean the venting (Page 66).
Replace the shaft sealing rings.
Checking the tightness of fastening
bolts (Page 67). Monitor gearbox.
Reseal.
Check the venting position, mounting
position (Page 76) and the oil level
(Page 54).
Call Technical Support.
Clean the fan cover and surface of the
geared motor (Page 66).
Check the mounting position (Page 76)
and the oil level (Page 54).
Checking the oil quality (Page 56).
Check when the oil was last changed. If
required, change the oil (Page 54).
Check the bearings and if required re‐
place.
Call Technical Support.
Check the mounting position (Page 76)
and the oil level (Page 54).
Checking the oil quality (Page 56).
Check the load against rated data (you
might need to correct the belt tension,
for example).
Check the circuit / connection of the
brake. Check brake for wear and re-ad‐
just brake if required.
Change the direction of motor or back‐
stop rotation.
Replace flexible elements.
Call Technical Support.
SIMOGEAR electric monorail gearbox
Operating Instructions, 01/2024, A5E53220855A/RS-AA
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