GEAR-TRANSFER 2847986 - Caterpillar

Perform this maintenance with the engine stopped.
If the crankcase breather is not maintained on a regular basis, the crankcase breather will become plugged. A plugged crankcase breather will cause excessive crankcase pressure that may cause crankshaft seal leakage.
Illustration 1 g00495506
(1) Bolt
(2) Hose clamp
(3) Breather assembly
(4) Seal
Loosen hose clamp (2) and remove the hose from breather assembly (3).
Remove bolt (1). Remove breather assembly (3) and seal (4).
Wash the breather element in solvent that is clean and nonflammable. Allow the breather element to dry before installation.
Install a breather element that is clean and dry. Install seal (4) and breather assembly (3). Install bolt (1) and tighten. Do not overtighten the bolt. Refer to Specifications for the proper torque.
Install the hose. Install hose clamp (2). Refer to the Operation and Maintenance Manual, "Torque Specifications" topic (Maintenance Section) for the proper torque.