1993/05/10 Caterpillar

New Oil Filter Base Supports Help Prevent Incorrect Oil Filter Base Installation{1306}

Usage:

D11N, 776B Tractors;
777B, 777C, 785, 785B, 789, 789B, 793, 793B Trucks;
994 Loaders

Description of Change: New oil filter base supports will help prevent incorrect oil filter base installation. Previously, because of the symmeterical design of the oil filter base, the oil filter bases could be installed on the base supports backwards. This could result in unfiltered oil passing through the engine. The new oil filter base supports include pins or lugs that will prevent the incorrect installation of the oil filter base.

Adaptable To: The chart identifies the machine models, new and former base support assemblies, and effectivity of the new oil filter base support assemblies.

The former support assemblies can be modified to ensure the correct orientation of oil filter base. See the applicable modification procedure.

Modification For 4W2901 Support Assembly

Illustration 1. Dimensions for modifying a 4W2901 Support Assembly.

1. Drill one 8.00 + 0.11 -0.08 mm (.315 + .004 -.003 in) diameter hole through the support at the location shown in Illustration 1.

2. Install a 9G9923 Pin in the hole drilled in Step 1.

Modification For 4W5938 Support Assembly

Illustration 2. Dimensions for modifying a 4W5938 Support Assembly.

1. Drill one 8.00 + 0.11 -0.08 mm (.315 + .004 -.003 in) diameter hole through the support at the location shown in Illustration 2.

2. Install a 9G9923 Pin in the hole drilled in Step 1.

Modification For 1W7325 Support Assembly

Illustration 3. Dimensions for modifying a 1W7325 Support Assembly.

1. Drill two 8.00 + 0.11 -0.08 mm (.315 + .004 -.003 in) diameter holes through the support at the locations shown in Illustration 3.

2. Install a 9G9923 Pin in each of the holes drilled in Step 1.

Modification For 7E8413 Support Assembly

Illustration 4. Dimensions for modifying a 7E8413 Support Assembly.

1. Fabricate a 20.0 × 40.0 mm (.79 × 1.58 in) lug from 10.0 mm (.39 in) thick low carbon steel.

2. Put the surface of the fabricated lug with the smallest area in position on the support assembly as shown in Illustration 4.

3. Weld the lug to the support assembly.

Caterpillar Information System:

1993/05/10 New Gas Springs For Engine Enclosure Doors{5486,7263}

1993/05/10 New Mount Bracket Minimizes Contaminants Into Key Start Switch{1553}

1993/05/10 Decal Location{7581}

1993/05/10 Shims Used To Provide Clearance Between Pin Retainers And Truck Body{7258,7250}

1993/05/10 Sleeves Available For Rebuilding Tractor Oscillating Hitch Pin Bores{7057,7066}

1993/05/10 New Washers Used In Differential Group{3250}

1993/05/10 Longer Engine Mounting Bolt Resists Loosening{1152}

1993/05/10 Orifice Plate Used In Muffler Outlet{1061,1050}

1993/05/10 New Control Valve Group Eliminates Hoist Valve Instability{5136,5100}

1993/05/03 Yellow And Black Polyurethane Touch-Up Paint Available {7559,7581}

1993/05/03 Magnetic Relays Relocated To Eliminate Excessive Vibration {1400,1426}

1993/05/03 Loader Bucket Auxiliary Lines {5050}

1993/05/17 Air Horn Group Now Standard To Meet Overseas Specifications {7402}

1993/05/17 Optional Bronze Thrust Disc Available {3160}

1993/05/17 New Seals Assist In Preventing Cooling Oil Transfer From Brake To Wheel Oil {4251}

1993/05/17 Holes Drilled Inside The Transfer Gearbox Case Can Improve Oil Flow {3106,3100}

1993/05/17 Deflector Plates Prevent Mudflaps From Coming In Contact With The Tires {4220,7252,4200}

1993/05/17 Steering Hoses With O-ring Face Seal Fittings Available {4304,4300}

1993/05/17 Relief Valve Tolerance Has Been Changed {5050}

1993/05/17 Door Insulation Retention Method Is Improved {7308,7300}

1993/05/17 Air Conditioner System Refrigerant Refill Capacity {7320,7300}

1993/05/17 New Radiator Tie Bars Resist Cracking {1353,1350}

1993/05/17 Battery Isolation Switch Has Been Moved To Improve Access {1411,1400}

1993/05/17 Hoist Cylinder Hoses With O-ring Face Seal Fittings Available {5057,5050}