HOUSING AS 1878883 - Caterpillar

Check the Condition of the Metal Seal Ring
Illustration 12 g02080993
Illustration 13 g02080995
Check the condition of the metal sealing ring. Look for scoring of the metal face and grooves on the sealing band. Also, look for pieces that have been removed from the sealing band. Refer to Illustration 12. Refer to 13.
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There are three reasons for scoring damage to the metal sealing rings. The causes are listed below:
Debris may be located between the sealing surfaces. You will need to find the debris that scores the seal.
Surface contact will cause fatigue. Check the type of oil that is used in the cavity for the duo-cone seal gp. Make sure that the sealing ring has not slipped. Make sure that the machine was not allowed to travel above the design parameters.
Machines that are experiencing early hour failure will need to be checked. The machine may not be ran until the machine is broken in. the early hour failure usually occurs after a repair or after a rebuild. Lock the machine out of top gear for the first 10 to 50 hours. This procedure will allow the sealing ring to relax into the designed operating load for the face.
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Location of the date of manufacture on the metal sealing ringAfter all of the initial examinations of the seal are done, the seals will need to be marked. The mark will inform you of the location of the seal. Carefully remove the seals.Note: If the face seal is scored, the outer diameter of the seal could be sharp. The proper safety precautions should be followed during the removal of the metal sealing ring.Measurement of the Compression of the Toric Ring
The condition of the toric ring after disassembly is important. The toric ring should be round. Roll the toric ring between your fingers and feel for flat areas on the toric ring. If flat areas are found, then cut the toric ring and take a picture of the cross section of the toric ring. The flat areas are an indication of compression on the toric ring.
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The toric rings that are shown in Illustration 16 have taken some compression set during operation. The cross section of the toric ring is egg shaped. The toric ring will have two flat spots. The flat spots will be opposite each other 180 degrees.
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(A) 17.81 mm (0.701 inch) (B) 14.78 mm (0.582 inch)The smallest measurement is 14.78 mm (0.582 inch) and the largest measurement is 17.81 mm (0.701 inch).Note: Compression of a toric ring is typically caused by heat or age. Review the machines ECM or VIMS in order to obtain the warnings for the temperature of the brake or axle.Additional References for the Duo-cone Seal Gp
Illustration 18 g02082053
The toric ring on the left has spun in the seal bore and the sealing ring has worn a flat spot into the seal.The toric ring may have a flat area on the circumference of the toric ring. The flat spot may be caused by spinning in the housing and the