FLANGE 4451824 - Caterpillar

REPAIR A LEAK IN THE ARMATURE
Parts Required: 378-8315 Seal Kit Note: Use 100% Silicon Sealer in order to repair the leak.Note: If Bushings are not installed on all pins, then add them to the Armature pins without them.Note: Be sure to brake the flywheel, so it comes to a complete stop. Then place the UPS in Bypass. After 5 minutes time, verify the UPS is de-energized, then proceed with the troubleshooting procedure.
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Bushing, Armature seal
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Split washerFlat washerNut, HexConnector, Armature terminalBolt, Cap, Hex
Disconnect the terminal from the Armature copper pin.
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Clean the Surface of the armature pin and flywheel housing using Methanol or 99% Isopropyl alcohol.Note: A clean surface is essential for the silicone, in the next step, to create a lasting seal between the flywheel housing and the armature pin and bushing.
Apply GE Silicone Type II to the surface of the Bushing, Armature Seal, and into the Armature copper pin port of the bushing.
Apply the Bushing, Armature Seal over the Armature copper pin and up against the flywheel housing.
Ensure that the silicone extrudes around the bushing and through the bushing, around the Armature copper pin. Refer to Illustration 4.
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Extruded Silicone when Bushing, Armature Seal installed with 100% Silicone
Remove the excess silicone from the copper pin of the armature.
Clean the Armature copper pin using Methanol or 91% or greater Isopropyl alcohol.
Inspect the Bushing, Seal Armature to ensure that the silicone is still 100% around the Armature copper pin and the base of the Bushing, Armature Seal.
Slide Connector, Armature Terminal over the Armature copper pin to hold the Bushing, Armature Seal into place.
Use Washer, Flat on the bolt side of the Bolt, Cap and the Washer, Flat, Split and the Nut, Hex to secure the Armature cable to the Connector, Armature Terminal.
Wait for 1 hour in order to ensure that the vacuum is still in the operating range. Wiggle the cable gently in order to ensure that the leak has been sealed.
The leak has been sealed if the epoxy has cured and the vacuum is in the operating range after 2 hours.REPAIR A LEAK ON THE POSTS FOR THE FIELD COILS
Note: Use 100% Silicon Sealer in order to repair the leak.
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Possible locations for a leak
Isolate the exact area of the leak on the post for the field coil. Use a syringe for the best results.
Fill the syringe with a silicon sealant.
Apply a moderate coat of sealant to the area of the leak. Apply the sealant to the area around the leak. The vacuum should drop immediately after the sealant is applied.
Smooth the sealant on the post.
Wait for 1 hour in order to ensure that the vacuum is still in the operating range.
Repeat the process until the vacuum remains in the operating range.
The leak has been sealed if the sealant has cured and the vacuum is in the operating range after 2 hours.CONTACT CATERPILLAR.
Contact your dealership for a possible consultation with Caterpillar if a leak is not found and the vacuum continues to operate out of the tolerance