gmb / BA PowerGear_EN as of May 2015 / 29.10.2015
Page 18 of 23
10. Faults, causes, remedy
10.1 General fault indications
The Sections 5 "Safety notes" and 11 "Service and Maintenance" are to be complied with!
Faults occurring during the warranty period, which necessitate a repair of the gear unit, must only be removed by
service department employees of MS-Graessner.
If, on expiry of the warranty period, faults should occur whose cause cannot be clearly recognized, contact the
service department at MS-Graessner.
10.2 Possible faults
Faults
Causes
Remedy
Changed operating noise
Damage to gearings
Bearing play is increased.
Bearing is defective
Check geared components; if necessary, re-
place any damaged components, adjust bear-
ing play, contact service department
Replace defective bearing, contact service
department
Increased temperature at
the bearing points
Oil level in the housing is too low or too
high
Oil is too old
Bearing is defective
Check oil level at room temperature, if neces-
sary replenish or drain oil.
Check when the last oil change has been car-
ried out.
If necessary, change the oil
Check bearing condition; replace, if neces-
sary; contact service department
Gear unit is oily on the out-
side
Insufficient sealing of the bearing flang-
es and gear unit covers
Seal bearing flanges and gear unit covers
Oil leak at the ventilation fil-
ter
Oil foams
Oil level in the gear unit is too high
Incorrect execution of the ventilation
See fault "Oil foams in gear unit"
Decrease oil level in gear unit to the pre-
specified level
Prevent any direct oil injection by attaching
suitable extensions or angle pieces
Oil leaks from gear unit
Insufficient sealing of the bearing flang-
es and gear unit covers
Radial shaft seal rings are defective
Check seals, replace if necessary
Check radial shaft seal rings, replace if nec-
essary.
Oil foams in gear unit
Water in oil
Oil too old (De-foaming agent used up).
Unsuitable oils mixed up
Examine oil condition for water ingress by
means of a test tube sample.
Have the oil sample analysed, change oil.
Examine oil, change oil
Examine oil, change oil
Water in oil
Water condensates in the gear unit by
external climatic conditions, sun, wind,
cold: Ambient temperatures change a
great deal.
Protect gear unit against temperature influ-
ences
Increased operating tem-
perature
Oil level in the gear unit is too high.
Oil is too old
Oil is highly contaminated
Check oil level Correct if necessary.
Check when the most recent oil change was
carried out, change oil
Have the oil sample analysed, change oil.
