SHAFT ASSEM. 3P7129 - Caterpillar

Illustration 14 g00617618
Place a dial indicator on the vertical surface of the heat sink assembly. The heat sink assembly is located at the rear of the generators rotor shaft. See Illustration 14. The dial indicators plunger should be preloaded so that the forward movement of the rotor can be measured. Use the generator drive coupler to move the rotor forward. The amount of rotor end play that is shown on the dial indicator should be approximately 3.81 mm (0.150 inch) to 7.62 mm (0.300 inch).
Record the measured value of rotor end play on "Line F" of Table 2.
Divide the value of "Line F" by two. Record this value on "Line G" of Table 2 (F / 2 = G).
Illustration 15 g00617620
(7) Straight edge (8) End ring (9) Drive coupling
Move the rotor assembly to the rearmost position. Before proceeding, ensure that the air gap is equal between the rotor assembly and the stator. Position straight edge (7) across the diameter of end ring (8). See Illustration 15.
Measure the distance from the top of straight edge (7) to the mounting surface (H) of end ring (8). Record this value on "Line H" of Table 2.
Measure the distance from the top of straight edge (7) to the mounting surface (I) of drive coupling (9). Record the value on "Line I" of Table 2.
Subtract "Line H" from "Line I". Record this value on "Line J" of Table 2 (I - H = J).Note: Attachment of the straight edge (ferrous material) can be accomplished by using two magnetic bases from the dial indicator.
Take a standard set of 17 5N-4478 Flex Plates. Bolt the plates together by using the flywheel mounting holes. The bolts should be tight, but not tightened to the final torque. Measure the thickness of the plates in two locations along the border.
Calculate the average of the two measurements. Record this value on "Line K" of Table 2.
In order to determine the number of shims that are required to provide proper axial alignment, perform the calculation that is shown on "Line L" of Table 2 (J - B - E - G - K = L). Record this value on "Line L" of Table 2.
Divide the value of "Line L" by 0.8 mm (0.032 inch). Record this new value on "Line M" of Table 2. The value that is shown on "Line M" is the total number of shims. This value should be rounded up to the nearest whole number.
Put the coupling plate assembly in position at the flywheel bore in order to check for clearance. There must be clearance between the coupling plate assemblies outside diameter and the inside diameter of the flywheel bore.
Illustration 16 g00617609
(5) Coupling bolts (6) Coupling plate assembly
Do not run the generator set unless the plate assembly has the correct clearance. If the plate assembly does not have the correct clearance, damage can occur to the engine and/or generator.
Place the total number of shims onto the drive coupling. The total number of shims was calculated on "Line M" of