1993/05/17 Caterpillar

New Seals Assist In Preventing Cooling Oil Transfer From Brake To Wheel Oil {4251}

Usage:

785 (8GB),
785B (6HK),
789 (9ZC),
789B(7EK),
793 (3SJ),
793B (1HL) Trucks

Reference: Service Magazine; December 2, 1991; Page 5; "New Seal and Seal Assembly Available For Use in Brake Groups To Insure Better Control of Cooling Oil Flow " on 785, 789 and 793 Trucks.

Description of Change: New seals are used to assist in preventing cooling oil transfer from brake to wheel oil. The new seals require a deeper groove in the hub, so new hubs are also used.

Adaptable To: The new seal as., hubs and D-ring seals replace the former O-ring seals, hubs and D-ring seals as shown in the Chart. The new seal as., hubs and D-ring seals are effective with 785 [(8GB670) Front and Rear], 785B [(6HK1) Front and Rear], 789 [(9ZC634) Front and (9ZC613) Rear], 789B [(7EK1) Front and Rear], 793 [(3SJ19) Front and Rear] and 793B [(1HL1) Front and Rear] Trucks.

Caterpillar Information System:

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

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

1993/05/10 New Oil Filter Base Supports Help Prevent Incorrect Oil Filter Base Installation{1306}

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}

1993/05/17 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}

1993/05/17 Cab Air Intake Sealing Can Be Improved {7342,7304,7300}

1993/05/17 Brake Fluid Reservoir Has Been Moved To Prevent Overheating {4291,4250}

1993/05/17 Method For Bleeding And Charging The Rear Suspension Has Been Changed {7200}