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10 TROUBLE-SHOOTING
10.1 TROUBLE-SHOOTING, FAULT DIAGNOSIS, AND REPAIR
10.1.1 Common errors with actions
Screw jack worm gear unit problems:
Symptom
Possible Causes
Remedy
Spindle does not move, even
though the motor is running or the
input shaft is rotating.
Drive between shafts interrupted
in the gear unit.
Return the gear unit / geared
motor for repair. Contact AB
Benzlers.
Unusual, regular running noise.
a) A meshing or grinding sound :
damage to bearings.
b) A knocking sound : irre- gularity
in gearing.
a) Check grease (See Mainte-
nance).
b) Contact AB Benzlers.
Unusual, irregular running noise.
Foreign matter present in the
grease.
a) Check grease (See Mainte-
nance).
b) Stop the unit, contact AB
Benzlers.
Grease leaking 1)
• from worm gear unit cover
• from motor flange
• from gear unit flange
• from output end oil seal
a) Defective gasket on gear unit
cover.
b) Defective gasket.
a) Retighten screws on gear unit
cover and observe gear unit. If still
grease leaks contact AB Benzlers.
b) Contact AB Benzlers.
1) It is normal for small amounts of oil / grease to leak out of the oil seal during the running in period (24
hours running time).
10.1.2 Other errors
Errors of alignment fall into categories of angularity and eccentricity, or a combination of both.
NOTE: ABOUT SHAFT ALIGNMENT!
Errors of angularity should be checked for, and corrected, before errors of eccentricity.
Alignment in accordance with the following procedure will ensure vibration levels meeting
those set out in ISO 10816 Part 1.
Errors of Angularity:
Figur 17. Angularity