Page 284 - Root Cause Failure Analysis

272 Root Cause Failure Analysis

Table 261 Common Failure Modes of Gearboxes and Gear Sets

d

0
0
0

~
00
00
I

Source: Integrated Systems, Inc.

Poor maintenance practices are the primary source of real misalignment problems.
Proper alignment of gear sets, especially large ones, is no easy task. Gearbox manu-
facturers do not provide an easy, positive means to assure that shafts are parallel and
that the proper center-to-center distance is maintained.

Induced misalignment also is a common problem with gear drives. Most gearboxes
are used to drive other system components, such as bridle or process rolls. If mis-
alignment is present in the driven members (either real or process induced), it also
will directly affect the gears. The change in load zone caused by the misaligned driven