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Home›Repair guides›Caterpillar›Generator Bearing - Lubricate

Caterpillar — Generator Bearing - Lubricate

Maintenance

From a Caterpillar owner's manual covering: C3.3, C3.3 Rental Generator Set, C4.4, C4.4 Rental Generator Set, D4D1-Up, GLE1-Up, N3X1-UP, N4R1-Up, N4X1-Up, X3B1-UP, XYC1-Up, XYD1-Up. Check it applies to your exact model before use.

Applies to: Caterpillar C3.3, Caterpillar C4.4

Before you start

  • Do not mix greases

Parts for this job

Part numbers from the service-parts lists for Caterpillar C3.3, Caterpillar C4.4. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. If the generator already has a visible grease point, go to Step 4.
  2. Remove the louver assembly or rear plate from the rear of the generator housing.
  3. Remove the top grease pipe plug and the lower grease pipe plug.
  4. Install a grease fitting in the grease pipe.
  5. Grease the bearings with the appropriate grease from Table 22. Do not mix greases.
  6. Wipe off the excess grease. Remove the top grease fitting. Install the plug.
  7. Operate the generator for one hour until grease stops purging.
  8. Stop the engine. Install the plug in the bottom grease pipe. Wipe off excess grease.
  9. Install the louver assembly or the rear plate.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • 2S-3230 Amazon eBay Bearing Lubricant: 51.2 g (1.8 oz), 59 mL (2 oz), every 2000 service hours or 12 months
  • Mobilith SHC220: 2.8 g (0.1 oz), every 250 service hours
  • UNIREX N3: 60 g (2.1 oz), every 4500 service hours or 12 months

Full service-parts list: Caterpillar C3.3 →, Caterpillar C4.4 →

Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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