CYLINDER BLOCK AS 4345141 - Caterpillar

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Mount a dial indicator near bolt circle of the flange and measure the gear set backlash.
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Turn down the flange nut until the desired backlash is achieved. Backlash should be 0.31 to 0.21 mm (0.008 to 0.012 inch).
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Remove the flange.
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Reinstall tooling (A) and remove center section.
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Use a feeler gage to measure the distance between the race and the bore shoulder. Take measurements in three or more places around the race to determine the thickness of the shim to be used in assembling the unit.
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Select the correct shim as determined in the previous step. Place the shim into the bore and follow with the bearing race, center section, and flange. Recheck backlash again.
Check for proper bearing preload.
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Note: Do not install o-ring yet.
With the flange in place without the o-ring, tighten both retaining screws. Then loosen one screw out 2 - 3 turns while keeping the other screw tight.
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Lightly turn the loosened screw in until contact is made with the flange.
Now, tighten the loosened screw until snug. Proper bearing preload will be achieved when the screw needs to be turned 90° to tighten.
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Adjust bearing preload as needed. Rotating the flange nut clockwise will increase preload. Turning the flange nut counter clockwise will decrease preload.Note: Tap the flange lightly with a soft faced mallet to "settle" the bearings during the adjustment.
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Remove flange and install 352-4347 O-ring (4) .
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Remove tooling and install bolts removed in Step 4. Tighten bolts to 290 N m (214 lb ft).
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Install lock and bolt. Use LockTite® on bolt.
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Install flange and align marks made in Step 1. Tighten to correct torque. Refer to Torque Specification, SENR3130, "Metric (ISO) Fasteners".
Install differential into axle. Torque for the bolts holding the differential in the axle is 560 N m (413 lb ft).The procedure described in this Special Instruction is adaptable to the following machines.
(S/N: PAK254,271-273,275,279)The procedure described in this Special Instruction is effective for the following machines.
(S/N: PAK280-UP)