Usage:
Caterpillar Service Technology Group is announcing the 1U5495 Latch Group is available for installation on earlier 8T530, 8T531, 8T7789 and 8T9206 Seal Installer Assemblies. Later 8T530, 8T531, 8T7789 and 8T9206 Seal Installer Assemblies include this latch group. The 1U5495 Latch Group is available through the Caterpillar parts system. The 1U5495 Latch Group bridges the sawcut gap on the seal installer and will:
... Hold the seal installer lips in alignment at the gap.
... Prevent the gap from opening which changes lip-to-toric position during seal installation.
... Latch the installer in the "open" position. This allows installer removal without disturbing the installed seal assembly.
Use the Latch Installation Procedure to install the 1U5495 Latch Group on earlier 8T530, 8T531, 8T7789 and 8T9206 Seal Installer Assemblies. Use the Seal Installation Procedure when installing a Duo-Cone Seal with a seal installer that includes a 1U5495 Latch Group.
Latch Installation Procedure
1. Form all sheet metal strips and plates of the 1U5495 Latch Group to the correct curvature by bending around a radius slightly smaller than that of the seal installer. This allows for "spring-back". Then, when the piece is firmly applied to the installer, it conforms to the curvature of the installer.
2. Refer to the illustration and chart for Dimensions (X) and (Y). Mark dimensions (X) and (Y) on the installer.
Dimensions and component locations for 1U5495 Latch Installation.
3. Clamp the seal installer in a parallel-jawed vice with the installer sawcut gap opened 5 mm (.2") as shown in the illustration.
4. Position strip (A) on the installer and against the vise jaw opposite the installer working edge as shown in the illustration. Locate strip (A) so the mounting hole is bisected by the line at dimension (Y). Hold strip (A) in position and use as a template to center punch the installer surface a distance slightly less than the distance between the hole centers.
5. Drill the locations center punched in Step 4 with a No. 29 drill (.136" Dia.). Thread the holes with an 8-32 tap. Install strip (A) and cover plate on the installer with two 7S1197 Screws as shown in the illustration.
6. Slide tongue plate, with one edge against strip (A), under the cover plate. Hold the tongue plate in this position for Step 7.
7. Slide strip (B) under the cover plate and against the tongue plate. There must be a slip fit between strip (B) and the tongue plate. With the mounting holes in the cover plate and strip (B) in alignment, center punch, drill and tap the installer as directed in Step 5. Install two 7S1197 Screws as shown in the illustration.
8. Position the tongue plate so that the first two holes in the tongue plate are bisected by the line at dimension (X). Hold the tongue plate in position and use as a template to mark four mounting holes in the installer. Center punch and drill the four mounting holes with a No. 29 drill (.136" Dia.). Thread the four holes with an 8-32 tap. Install the tongue plate on the installer with four 7S1201 Screws as shown in the illustration.
9. Drill a 1/4" diameter hole through the installer at the center of the large hole in the cover plate. Install the latch screw [1/4-20 thread, 18 mm (.7") long], 1/4" washer and wingnut (1/4-20 thread) as shown in the illustration.
With this installation procedure, the sawcut ends of the installer should be held in good alignment and provide uniform force on the toric during seal installation. The tongue plate should slide freely under the cover plate.
Seal Installation Procedure
1. Put the rubber toric on the steel seal ring. Be careful to avoid any initial twist in the toric. Lay the seal assembly on a flat, clean surface with the toric on the bottom.
2. Loosen the wing nut on the latch screw. With light pressure on the latch screw, spread the installer apart until the head of the latch screw drops into the detent in the tongue plate. This will hold the installer open.
3. Place the installer on the seal assembly with the working edge of the installer firmly against the rubber toric. Push to release the latch screw from the detent in the tongue plate and close the installer firmly. Tighten the wing nut on the latch screw.
4. Lubricate the toric with isopropyl alcohol and install the seal assembly into the housing.
5. When the seal assembly is in the correct location, loosen the wing nut on the latch screw and spread the installer until it latches open as in Step 2.
6. Remove the installer without disturbing the seal assembly.