SHAFT 5S6350 - Caterpillar

UPS flywheel bearings must be changed due to wear and vibration. The bearings must be changed as per the guidelines in the Operation and Maintenance Manual, SEBU8859, "Maintenance" section or sooner if needed. Indications of bearing wear that necessitate bearing change are listed below:
Vibration
Temperature
Increase in operational noise levelNote: Bearings are always changed as a top and bottom set. The bottom bearing is changed first, then the top bearing.The UPS flywheel cabinet must be offline, de-energized, and the flywheel at zero RPM.
Illustration 1 g03557523
Cross sectional view of the flywheel assembly
(1) Poles
(2) Upper bearing cartridge
(3) Rotor
(4) Armature
(5) Lamring
(6) Field excitation coil
(7) Lower bearing cartridgeTooling
The following is a list of tools that will be needed for bearing replacement. For a current list of parts refer to Parts Manual, SEBP6767.Note: All tooling sizes are listed in inches.
448-3674 Hand Tool Gp
Hex drivers and wrenches: 1/8, 5/32, 3/16, 5/16, 3/8
Sockets: 3/8, 9/16, 3/4, 1
End wrench: 1-1/2 short, 3/8 open end
Ratchets and extensions
Torque wrenches: 10, 20, 30, 40, 64 in-lbf and 35, 50 ft-lbf
466-6470 Instrument - Micrometer (UPS750)
Bearing grease (Turmo N502B) - supplied with bearing grease (supplied with bearing)
3/8-24 x 6.0 SHCS (set of 2)
Medium strength Loctite
Low strength LoctiteBearing Tool Kit
Illustration 2 g03557524
448-3674 Hand Tool Gp
(10) Guide pin
(11) Shaft bolt
(12) Bearing tool
(13) Guide pin with thumb screw
(14) Short mounting bolt
(15) Sleeve
(16) Washer
(17) Stub shaft
(18) Long mounting bolt
(19) Spacer ring
(20) SpacerBearing Tool Drive Nut Operation
Illustration 3 g03557526
Bearing tool
(25) Shaft bolt 1/2 - 20 x 6.0 CHCS
(26) Stud
(27) Drive nut
(28) Backup wrench raised feature
(29) Plate/retainer
(30) MTG slots
(31) MTG slotsRotation of the drive nut clockwise (CW) raises the stud (26). Raising the stud (26) provides various functions:
Installs the bearing on the shaft
Removes the bearing from the upper sleeve
Pulls the bearing into the lower housingCounter clockwise (CCW) rotation of the drive nut lowers the stud (26). Lowering the stud (26) provides various functions:
Removal of the bearing from the shaft
Installation of the bearing in the upper sleeve
Push the bearing out of the lower housingBearing Change Pre-Removal Steps
Read and understand all safety and hazard-related information before the following procedure is attempted. The information is found in the Operation and Maintenance Manual, SEBU8859.Note: Bearing service is always performed on both the upper and lower bearings.Note: Always change the lower bearing first.All input to the flywheel cabinet must be shut down before changing the bearings. The customer load will be unprotected.
If the flywheel is not at zero RPM already, brake the flywheel. Use the "Control-X" function in UPSView to stop the flywheel.
Rotate the key switch on the flywheel cabinet to the Bypass position.
The UPS must be shut down before any work is done to the cabinet. Follow the appropriate shutdown/bypass procedure for the system configuration.
Discharge the DC bus. Let the DC bus discharge to a level that is below 24 VDC.
Open the doors of the cabinet by using a hex key on the upper and lower latches.
Discharge the capacitors. Allow the capacitor banks in the UPS to discharge for 5 minutes.
After rotor has stopped, record the upper bearing force and temperatures of the field coil, upper