LINEAR VIBRATION CONTROL
TESTING AND ADJUSTING
SUBJECT:
Linear Vibration Control -- Engines With Single-Bearing Generators
BUSINESS:
Building Services, Marine/Petroleum, Material Handling
PRODUCT/APPLICATION:
3408 Engines With Single-Bearing Generators, Generator Sets
This Engine Data Sheet supplements the information in EDS 73.1.1. Information that follows relates only to later 3408
PC-TA Engines driving single-bearing generators.
We no longer recommend the use of piloted shaft,
single-bearing generators on 3408 PC-TA Generator Set
Engines. Effective with the 3408 Generator Set Engine,
Serial No. 67U1099, a 7N6395 flywheel assembly is
installed which requires use of piloted drive plates.
Although the close tolerance shaft pilot continues on the
5N39, 5N40, 5N41, and 5N42 generators, it is not used
for alignment during assembly. Instead, the accurately
machined drive (coupling) plates function as the initial
alignment device. This drive arrangement can be
applied to any 3408 PC-TA Generator Set Engine
equipped with a 7N6395 flywheel assembly.
FIGURE 1
7N6395 FLYWHEEL ASSEMBLY
A 7N6395 flywheel assembly is readily identified by
absence of the usual finished shaft pilot hole at the
center and presence of the deep pilot bore (18.379 in.
to 18.377 in. [466.83 mm to 466.78 mm]) at the outer
diameter. See Figure 1. A 5N2030 coupling plate
assembly from a 5N2021 coupling group properly aligns
the generator rotor to the flywheel. The 5N2030
coupling plate assembly is machined to an outside
diameter of 18.374 in. to 18.372 in. (466.69 mm to
466.65 mm). Do not attempt to use the 2N7025 coupling
plate assembly from a 5N1628 coupling group. The
2N7025 plate assembly has an outside diameter of
18.365 in. (466.47 mm) and will not correctly align-a
generator with the flywheel.
FIGURE 4
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