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Assemble to Prime Mover: Alignment
Two-Bearing Alignment
Follow the tolerances specified by the coupling manufacturer when
they are less than described in this manual.
Use shims, if necessary, between the mounting pad and the base to
properly level and align the generator to the prime mover.
Install the coupling(s) on the generator and engine drive shafts in
accordance with coupling manufacturer installation procedures. Use a
straight edge and a thickness gauge for rough alignment as shown in
Figure 12.
Figure 12 Rough Alignment
Check for angular and parallel alignment as follows:
Angular Alignment:
Fasten a dial indicator to one of the coupling
halves, and scribe the position of the dial button on the face of the
opposite coupling half as shown in Figure 13. Rotate both shafts
simultaneously, keeping the finger or button on the indicator at the
reference mark on the coupling hub. Note the reading on the indicator
dial at each one quarter revolution.
A variation of readings at different positions will indicate how the
machine needs to be adjusted to obtain a maximum misalignment of
0.001 inch for each inch of the coupling hub’s radius, total indicator
runout. Place or remove slotted shims from under the front or rear
engine or generator mounting pads and/or shift the front or back half
of one component from side to side until the components are properly
aligned. Tighten the mounting bolts, and recheck alignment.
NOTE:
Mounting of the indicators must
allow complete rotation of the prime
mover.
Use dial indicators that are rigid so
indicator sag won’t be a factor. Using the
shortest offset distance of the indicator
bracket will reduce the effects of indicator
droop or sag.
During alignment, you may also need to
compensate for engine expansion due to
heating. Generator expansion is generally
not considered a factor.
If the genset is moved to a different
location, check alignment before startup.
WARNING:
Do not pry on the
generator fan blades. The blades can
weaken, which could result in serious
injury or death from flying debris.
CAUTION:
Generators equipped
with sleeve bearings must have oil added
to the bearing prior to rotation. See the
bearing manual.
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