LINER-CAB 1234188 - Caterpillar

Illustration 6 g02358956
Specifications of a usable carrier seal ring bore. (A) Bearing mounting diameter (B) Bore 71.63 mm (2.820 inch) (C) Bearing bore (D) Seal ring bore 82.58 mm (3.251 inch) (J) Chamfer 30 degree × 0.8 mm (0.03 inch) (K) 1.5 mm (0.06 inch) (L) Length of seal ring bore 16.8 mm (0.66 inch) (M) Chamfer 30 degree × 1.5 mm (0.06 inch)The 5M-7966 Sleeve and the 1M-3937 Metal Seal Ring are used to seal between the center shaft and the carrier. The 1M-3937 Metal Seal Ring can wear a groove in the 82.58 mm (3.251 inch) diameter seal ring bore of the carrier (refer to Illustration 6).A carrier with seal ring bore damage can be used again after carrier is salvaged using an application of chrome plate or metal spray.Preparation for Chrome Plating
Before the application of chrome plating, check the specification of the diameter and grind as follows:
Install the carrier in an internal grinder. Chuck on the 71.63 mm (2.820 inch) diameter bore (B) of the carrier. Zero set the part by an indication of TIR of the bearing mounting diameter (A) .
In most cases, there is no sign of wear to the bearing bore (C). It is important that both the bearing bore and the seal ring bore should be concentric (having a common center) to the bearing mounting diameter (A), within 0.05 mm (0.002 inch) TIR or less. Check the bearing bore to see if the part is acceptable according to this specification.
If the bearing bore is not concentric to the bearing mounting diameter within 0.05 mm (0.002 inch), bearing must be ground to a depth that will give 0.05 mm (0.002 inch) TIR or less in relation to diameter. Do not grind the bearing bore if concentric to the diameter within 0.05 mm (0.002 inch). If the bearing bore is machined, there must be no indication of grinding errors such as chattering, checking, or burning.
A worn seal ring bore must be ground to a depth that will remove all indications of surface wear. Grind the seal ring bore to a length of 16.8 mm (0.66 inch) (refer to Illustration 6). There must be no indications of grinding errors such as chattering, checking, or burning. The seal ring bore must be concentric to the bearing mounting diameter within 0.05 mm (0.002 inch) TIR.Plating Procedure
Use standard, commercial masking, plating baths and procedures for the application of the hard chrome plating.
After the plating is completed, the carrier must be put in an oven at 150 °C (302 °F) for 3 hours for hydrogen embrittlement relief baking. Failure to put the carrier into the oven within 1 hour after carrier is removed from the plating bath can cause the carrier to crack.
Procedure to Grind after Plating
Install the carrier in an internal grinder. Chuck on the 71.63 mm (2.820 inch) bore (B) of the carrier. Zero set the part by an indication of TIR of the bearing mounting diameter (A), Illustration 6.
Grind the chrome plating carefully