QubicaAMF XLi Pinspotter Motor and Gearbox Manual
400-088-038
34
Revision F
3.3.9
Detecting Back End Gearbox Problems
Inspect the gearboxes at least once every 60 days to identify the need for service or replacement. The
following symptoms can be detected without any disassembly.
Oil Leakage
Oil leakage from seals can indicate shaft and/or seal wear.
High Internal Operating Temperature
The maximum normal operating temperature of a back end gearbox is 50 ºF (28 ºC) above ambient.
Higher temperatures may be caused by low oil level or internal component failure. As a general
rule, higher operating temperatures warrant a complete examination.
Shaft End Play and/or Gear Backlash
Excessive radial or axial gearbox shaft movement (end play) indicates worn bearings, broken
retaining rings, incorrect shimming, etc. Excessive backlash (rotational shaft movement without
resistance) indicates gear wear.
Excessive Noise
A certain amount of noise is inherent in gearbox assemblies and is normal. Excessive noise such as
grinding or popping sounds coming from a gearbox indicates internal problems. This unit should be
removed from service and replaced or repaired if possible.
3.3.10 Separating the Gearbox and Motor
Whenever the motor is removed from the gearbox, inspect the motor shaft, coupling, and spider for
damage or excessive wear. Replace as necessary.
A word about serial numbers
Gearbox serial numbers are a combination of two different numbers. The first is a batch number
representing a grouping of gearboxes made around the same time. The second is an item specific
number that represents where, in sequence, the gearbox was made within the batch. So a gearbox with
serial number 141158.001 represents the first gearbox manufactured within batch 141158. Red labels
indicate a 50 Hz gearbox, while black labels indicate 60 Hz. Additionally, the part number for the gearbox
oil is on the label, as well.
