SCRAPER 0996135 - Caterpillar

Drive Hub Installation for Some Applications
Note: Not all applications require the information or installation fixture discussed in this procedure. Refer to Systems Operation, Test and Adjust, and Disassembly and Assembly, SENR5359, "Coupling - Remove" for drive hub location on the main rotor shaft.Use the following information in Illustration 1 only if your application requires the use of the stop fixture to provide location of the drive hub.
Table 1
TOOLS NEEDED    
Tool     Quantity    
Stop Fixture. Refer to Illustration 1.     1    Make note of the position of the original drive hub. The important dimension is measured from the face of the drive hub flange to the (machined) face of the adaptor. If a new drive hub is used, ensure that dimension is the same as the original drive hub.
Illustration 1 g00615434
Stop fixture (A) 114.3 mm (4.50 inch) (B) 19.7 mm (0.78 inch) (C) To be determined by measurement for the drive hub before removal for either the SR4B or the SR4 application. (D) 50.8 mm (2.00 inch) (E) 12.7 mm (0.50 inch) (F) 19.1 mm (0.75 inch) (G) 50.8 mm (2.00 inch)Note: The drive hub is a heavy shrink fit installation.
Evenly heat the drive hub to 400 °C (752.0 °F). An oven is the preferred method for heating the drive hub.
Always wear protective gloves when handling parts that have been heated.
Place the drive hub on a work bench.
Illustration 2 g00615500
A drive hub with a stop fixture attached.
Attach the stop fixture to the drive hub.
Illustration 3 g00615513
Slide the drive hub on the rotor shaft. Continue to slide the drive hub until the stop fixture contacts the rotor shaft.
Illustration 4 g00615518
Remove the stop fixture from the drive hub.Drive Hub Installation for Other Applications
Drive Hub Installation
Installation Process with Torch
Allow the rotor shaft to cool completely to the ambient temperature after removal of the hub.
Clean all scratches, grooves, and imperfections on the shaft and on the hub carefully. The appropriate tools must be used to clean the inside diameter of the hub properly.Note: This step assumes that the original drive hub will be installed again.
Install a link assembly on the drive hub to support the hub for installation.
Install the appropriate stop that will locate the hub properly upon installation onto the rotor shaft.
Use an appropriate lifting devise to place the drive hub at approximately the same height of the rotor shaft. (The lifting device will allow less distance for the hub to be moved after the heat is removed.) Refer to Illustration 5.
During drive hub installation, since there will be no direct flame on the main rotor shaft, a wet (cool/cold) towel can be wrapped around the rotor shaft, near the lip seal and shaft bearing. The towel will help reduce the heat exposure of the lip seal and bearing to the heat that is conducted from the drive hub through the rotor shaft.
Illustration 5 g02164086
Drive hub example. The drive hub in this illustration is not from a SR4 or SR4B application.
Use one of the rose bud torches to heat the inside bore of drive