FINAL DRIVE GP 8K1653 - Caterpillar

be inspected for damage and correct torque.All test measurements should be documented to establish trending data.Rectifier Diode Test
The following procedure tests each of the six diodes within the rectifier diode module. If any meter reading does not fall within the given ranges, replace the heat sink assembly. Refer to the "Removal/Installation" instructions.
High voltage may be present. The power source must be disconnected before working on the equipment. Failure to disconnect the power source could result in injury or death. Verify that the equipment is not energized before performing any maintenance. This work must be performed by trained personnel with correct tools and procedures. Bodily contact with electrical potential will cause personal injury or death.
Remove all leads from the rectifier diode module.
Set the digital multimeter to the diode range.
Place the black test lead of the multimeter on the positive "+" rectifier diode module terminal.
Place the red test lead of the multimeter on each of the following rectifier diode module terminals. Begin with "AC1", then "AC2", and finally "AC3".Note: All the meter readings must be between 0.4 VDC and 1.0 VDC.
Place the red test lead on the negative "-" rectifier diode module terminal.
Place the black test lead of the multimeter on each of the following rectifier diode module terminals. Begin with "AC1", then "AC2", and finally "AC3". Note: All the meter readings should be between 0.4 VDC and 1.0 VDC.
Place the red test lead of the multimeter on the positive "+" rectifier diode module terminal.
Place the black test lead of the multimeter on each of the following rectifier diode module terminals. Begin with "AC1", then "AC2", and finally "AC3". Note: In all cases, the meter should read "OL"(overload).
Place the black test lead of the multimeter on the negative "-" rectifier diode module terminal.
Place the red test lead of the multimeter on each of the following rectifier diode module terminals. Begin with "AC1", then "AC2", and finally "AC3". Note: In all cases, the meter should read "OL" (overload).Note: A shorted diode can damage the exciter rotor. If a diode is shorted, then check the exciter rotor. Refer to the Testing and Adjusting, KENR5284, "Winding - Test" and the Testing and Adjusting, "Insulation - Test" sections for more testing information. Perform the tests that are shown in "KENR5284".
Install all the leads to the rectifier diode module. Torque the screws. The torque for the connections can range from 2.35 N m (20.8 lb in) to 3.35 N m (29.7 lb in).Rotating Heat Sink Assembly Removal/Installation Instructions - 1800 Frame Generators Only
Use the following instructions to remove and to replace the rotating heat sink assembly. DO NOT attempt to replace any individual component on the rotating heat sink assembly.
Label the wires to ensure correct wiring upon installation.
Remove wires from terminals.
Remove mounting bolts.
Remove heat sink assembly.
Replace heat sink assembly.
Apply 9S-3263 Thread Lock to bolts. Install the bolts. Torque the bolts according to Table 1.Table
Table 1
Bolt Size Torque
5/16 inch 35.4 N m (26 lb ft)
3/8 inch 55.8 N m (41 lb ft)
Inspect the