Possible faults Causes Possible remedies
Main drive motor does
not start
Motor direction of rotation incorrect
● Change polarity of motor
Backstop cage with sprags incor‐
rectly installed or defective
● Contact Customer Services
● Install the backstop cage, rotated through 180° - or replace
Overrunning clutch blocked
● Contact Customer Services
● Replace the overrunning clutch
Overrunning clutch cage with
sprags incorrectly installed and/or
defective
● Contact Customer Services
● Install the overrunning clutch cage, rotated through 180°
- or replace
Main drive motor can
start while the auxiliary
drive is operational
Defective electrical interlocking be‐
tween the main and auxiliary motor
● Check the connections
● If necessary, replace defective devices
Defective speed monitoring
● Check the connections
● If necessary, replace defective devices
Auxiliary drive motor
does not start
Overload at the output
● Reduce the load at the output
Defective auxiliary drive motor
● Repair the motor or replace
Motor brake not released
● Correct the electrical connection of the motor brake
● If required, replace the motor brake
The auxiliary drive mo‐
tor starts, the main
gear unit output shaft
does not turn
Motor direction of rotation incorrect
● Change polarity of motor
Overrunning clutch cage with
sprags incorrectly installed
● Contact Customer Services
● Install the overrunning clutch cage, rotated through 180°
- or replace
Defective overrunning clutch
● Contact Customer Services
● Replace the overrunning clutch
Leaks
Inadequate sealing of the housing
cover or joints
● Seal housing cover or joints
Labyrinth seals oiled up or transport
position incorrect
● Check oil filling
● Clean the labyrinths
Inadequate sealing of the housing
cover or joints
● Check the seals
● Replace, if necessary
● Seal housing cover or joints
Defective rotary shaft sealing rings
● Check the rotary shaft sealing rings
● Replace, if necessary
Servicing
8.4 Possible faults
Gear unit 5118en
92 Operating Instructions 10/2017
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