GEAR GP-OUTPUT TRANSFER 1148947 - Caterpillar

Use
Apart from installation-related, some causes for bearing leakages can be use-related. Refer to the following sections for more information.Oil Pressure (for flood lubrication)
The inlet oil pressure for each bearing is calculated according to the desired oil flow. Adjust the oil pressure accordingly during commissioning.Verify the specific oil pressure value for each machine using the documentation provided with the machine.Oil level
Check the oil level of self-lubricated sleeve bearings regularly. Refer to Operation & Maintenance Manual, SEBU8852, "Sleeve Bearing - Check".Oil temperature
The correct lubrication oil temperature is critical for the following reasons:
Keeping the bearing at the correct operating temperature
Ensuring sufficient lubrication effect
Maintaining the correct viscosity of the lubrication oil. Refer to Operation & Maintenance Manual, SEBU8852, "Sleeve Bearing - Check" for more information.Vibrations
All motors are subjected to and designed to withstand vibrations. Large vibrations might cause various parts in the bearing to function differently than intended.Heavy vibrations can cause different phenomena in the oil film between the shaft and the white metal. Heavy vibrations result in bearing failures more likely than oil leakages.Heavy vibrations can cause the bearing housing parts to set. The bearing housing parts may loosen up to allow oil to enter the split surface between the upper and lower bearing housing halves. The vibrations will cause the bearing housing parts to move in respect of each other. This movement can cause a pumping effect in such a way that oil will be pumped in and out from the split surface. This pumping will eventually remove the sealant and cause the bearings to leak.Refer to Operation & Maintenance Manual, SEBU8852, "General Construction - Check" for specific information about motor vibrations and noise problems.Air pressure inside the bearing (for flood lubrication)
The bearing housing is not a hermetic compartment. Therefore, any overpressure inside the bearing housing will escape the bearing housing through the labyrinth seals. In escaping, the air will bring oil mist with it causing the bearing to leak.Overpressure inside the bearing is normally caused by other components than the bearing. The most common reason for overpressure inside the bearing is overpressure in the oil return piping when the bearing is equipped with an external oil system.Air pressure outside of bearing (for flood lubrication)
Under pressure outside of the bearing will allow air to escape from inside the bearing. In escaping, the air will bring oil with it causing the bearing to leak oil. Under pressure outside the bearing is normally not caused by the bearing but by parts outside the bearing. Under pressure near the bearing housing is caused by rotational parts moving the surrounding air in such a way that a local under pressure is formed next to the exit of the shaft of the bearing.Use Verification
Sleeve bearing with flood lubrication
The inlet pressure of the oil must be verified and adjusted accordingly. The normal value for the oil pressure is 125 kPa 25 kPa (1.25 bar 0.25 bar). The specific oil pressure value for each machine must be verified from the documentation provided with the machine.Oil
The oil quality