PISTON 5J7359 - Caterpillar

Installation Procedure
A new dust seal may be installed when service is performed on the swing gear and bearing. Several dust seals are available for replacement. Compare the cross section of the former seal with the cross section of a new seal.Note: Do not substitute seals. The cross section of the new seal must be identical to the cross section of the seal that is removed.Illustration 2 shows the cross sections of the dust seal.The procedure for the replacement of the dust seal depends on the series of the machine and the model. Use the procedure that is appropriate for the seal in your machine.Procedure for the Installation of a 148-4685 Seal and a Vulcanized Seal
Refer to the Disassembly and Assembly Manual for your machine. Perform the procedure to disassemble the undercarriage frame assembly from the swing gear and bearing.
Illustration 1 g00873210
Typical Swing Gear And Bearing
(A) Inner Dust Seal In The Outer Bearing Race
(B) Outer Dust Seal In The Inner Bearing Race
Identify the location of the leak. The grease can leak from the inner dust seal (A) and from the outer dust seal (B). Illustration 1 shows the location of the dust seals and the correct names.
Remove the damaged dust seal from the swing bearing. Clean all the dirt and foreign material from the seal groove. Wash the seal groove with a suitable solvent that will not leave an oily residue.
Illustration 2 g00872579
Cross Section Of 148-4685 Seal
Confirm the shape of the dust seal before any installation is started. The dust seal is available in three different shapes. Illustration 2 shows the cross sections of the dust seal.Note: The 148-4685 Seal and the vulcanized seal listed in Table 1 have an identical cross section. The 148-4685 Seal is cut to length from bulk material. The vulcanized seal is a one-piece seal. The 148-4685 Seal is used for the outer dust seal in the inner bearing race. The vulcanized seal is used for the inner dust seal in the outer bearing race.
The installation of a new dust seal should be completed at minimum ambient temperature of 10 °C (50 °F) or higher.
Use isopropyl alcohol or other approved agents on the seal groove to lubricate the seal during assembly. Use a wooden driver that has a spherical point to install the dust seal in the seal groove of the swing bearing.Installation Of A Vulcanized Seal in the Seal Groove for the Inner Dust Seal
Note: Perform Step 1 through Step 5 of "Procedure for the Installation of a 148-4685 Seal and a Vulcanized Seal" before performing the installation procedure.
Install the new inner dust seal in the seal groove in the outer bearing race of the swing bearing.
Illustration 3 g00953834
Points Of Reference On The Dust Seal
Install points (C), (D), (E), and (F) in the seal groove. Use the following sequence to complete the installation of the seal. Refer to Illustration 3 for the location of the reference points.
Install the seal between point (C) and point (D).
Install the seal between point (E) and point (F).
Install the seal between