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Cummins N14 – Lubricating Oil Pump Drive Gear or Shaft – Replacement

Disassembly
To remove the drive shaft from the drive gear, do the following:
1. Install the shaft and the gear assembly in an arbor press.
2. Use a mandrel to push the shaft from the gear.

Inspection
Visually inspect the bore in the drive gear for damage.
Measure the inside diameter of the bore in the drive gear.

NOTE: If the bore inside diameter is not within specifications, the gear must be replaced.

Visually inspect the drive shaft for damage.
Measure the outside diameter of the drive shaft.

NOTE: Shafts that are damaged or worn smaller than the minimum given must be replaced.

Assembly
Use clean 15W-40 oil to lubricate the drive shaft.
Use spacer mandrel, Part No. ST-1157, and an arbor press to push the drive gear onto the drive shaft. If the spacer mandrel is not available, install the gear onto the shaft to the following dimension as measured from the end of the shaft.