1994/09/05 Caterpillar

New Plunger In Fuel Pressure Regulating Valve{1250}

Usage:

D11 (74Z),
D11N (4HK) Track Type Tractors;
776C (2TK),
784B (5RK) Tractors;
777B (4YC),
777C (4XJ),
785 (8GB),
785B (6HK),
789 (9ZC),
789B (7EK),
793 (3SJ),
793B (1HL) Trucks;
994 (9YF) Wheel Loaders;
5130 (7TJ, 5ZL),
5230 (7LL) Excavators

Description of Change: If machines powered by 3500 Engines are experiencing low fuel pressure, hard starting or reduced power, check the fuel pressure regulating plunger. See the illustration. Scoring or scuffing of this plunger or fuel manifold housing can cause the pressure regulating valve to operate incorrectly. For added reliabilty, a new plunger has replaced the former plunger. The new plunger is heat treated and will resist scuffing inside the fuel manifold. If scoring of the plunger or manifold housing is present, replace both parts.

Typical location of fuel pressure regulating valve and 114-5477 Plunger.

Adaptable To: The new 114-5477 Plunger is a direct replacement for the former 1W-7535 Plunger. The former plunger is canceled. The new 114-5477 Plunger is in effect as shown in the chart.

Caterpillar Information System:

1994/09/05 Air Cleaner Filter Screens Require Maintenance{1051}

1994/09/05 Improved Engine Door Hinge Used{7263}

1994/09/05 New Radiator Shroud and Support Bracket Improve Service Life{7272,1351}

1994/09/05 Fabric Suspension Cylinder Covers Are Now Used To Protect Cylinder Rods{7201}

1994/08/29 New Exhaust Manifolds, Longer Mounting Studs And Spacers Used In Exhaust Manifold Groups {1059}

1994/08/29 Oil Drain Assembly Improved To Reduce Thread Interference With Drain Plug {1302}

1994/08/29 Cylinder Head Bolt Tightening Procedure {1100}

1994/08/29 Description And Usage Of The Electronic Programmable Transmission Control II (EPTC II) {3168}

1994/08/29 Improved Automatic Retarder Control (ARC) {3121}

1994/08/29 Special Instructions SEHS9793 Available For Servicing 2A-6380 Suspension Seat {7324}

1994/08/29 Washer Can Be Used To Prevent Seal Deformation In The Hoist Control Valve Group {5051}

1994/08/29 New Extendable Stick Tube Assemblies Provide Better Routing Serviceability {5486}

1994/09/05 Fan V-Belt Part Number Has Changed For Certain Models With The 3204 Engine{1357}

1994/09/05 Use Of 4C-4377 Stress Plate Group In 3114 And 3116 Cylinder Block Reconditioning{0672,0673,1201}

1994/09/05 Remanufactured 3400 Cylinder Heads Now Use Intake And Exhaust Valves With Chrome Plated Valve Stems{1105}

1994/09/05 New Water Seals Used In Cylinder Head Assemblies{1124}

1994/09/12 Procedure To Bleed And Charge The Rear Suspension {7213}

1994/09/12 New Spring On Fan Belt Tightener Provides Longer Service Life {1358}

1994/09/12 New Fuel Priming Pump Assembly Used In Fuel Priming Pump Group {1258}

1994/09/12 New Seals In Pump Fastener Group And Fuel Injection Pump Group Have Improved Heat Set Resistance {1251}

1994/09/12 Improved Fuel Pump Bonnet Seal Has Better Heat Resistance {1251}

1994/09/12 New Gasket Use In The Water Lines Group {1380}

1994/09/19 Special Instruction SEHS9567 Is Available For Installing Oil Baffles In The 6WD Transfer Gearbox To Prevent Overheating{3250,3011,3000}

1994/09/19 New Gasket Material Used To Seal Bearing Housing to Drum And Procedure To Check Flatness Of Drum Head{6605}