PLATE 2231072 - Caterpillar

Lipping
Illustration 216 g03886358
Lipping is the permanent displacement of surface metal. Lipping will happen if a gear is too soft. Lipping will happen if a gear is overloaded during adequate lubrication. If the lubrication was not adequate, the damage would be a combination of scoring, metal pullout, and smearing.
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Gear Bores
Bores of gears in drive trains are sensitive to damage. If the gear will be reused, the bore must not have any wear or damage. A good light source is required to inspect fully the bore of a gear.Refer to "Prepare the Area for Inspection" to clean the bore of the gear. If the gear bore has stains that cannot be removed with 8T-7765 Surface Reconditioning Pad and solvent, do not reuse the gear. A gear with minimal damage to the bore can be reused. Make a careful decision on reusing any gear bore because gear bores are sensitive to damage. If a gear bore has more than one type of damage, the gear bore should not be reused. Gears with lightly damaged gear bores may be reused if each of the following conditions is true:
The case hardened surface has not been penetrated.
Damage is light.
There are not many damaged areas.
Damage can be smoothed with a 6V-2010 Polishing Stone.Gear Bores
Illustration 217 g06097424
This bore is in excellent condition and there is no visible damage.
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Illustration 218 g06097429
There is no wear or damage in this gear bore.
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Illustration 219 g03886379
Foreign objects have damaged the bore.
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Illustration 220 g06097434
Examine both edges of the gear.
Notice that the nick is NOT on the bearing surface and has NOT penetrated the case hardening.
Use a 6V-2010 Polishing Stone and oil to remove the sharp edges around nick (1) before reusing this gear.
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Illustration 221 g06097437
If a bore has stains, clean the bore of the gear. Refer to "Prepare the Area for Inspection" for more information. If the gear bore is cleaned and there are still instances of pitting, do not reuse the gear.
The standard cleaning procedures were applied to the bore of the gear in this illustration. The discolored lines were not removed. The discolored lines inside this gear bore are instances of pitting.
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Illustration 222 g06097442
Use good lighting for inspection of any gear bore. If the surface of the bore has an irregular contour, the beams of light will not be straight.
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Illustration 223 g06097443
Brinelling will create a hilly appearance and a hilly texture on the surface of the bore. Do not reuse a gear with a bore that has damage from brinelling.
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Illustration 224 g06097448
The bore on this gear has spalled.
Check lube quality, loading, parts alignment.
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Illustration 225 g03886434
The gear bore that is shown in the above illustration has corroded.
DO NOT USE THIS PART AGAIN.