1994/12/05 Caterpillar

Dry Start Priming Procedure for 3500 Machine Engines with Electronic Unit Injection (EUI){1250,1258}

Usage:

D11N (4HK, 74Z) Track-Type Tractors;
776B (6JC),
776C (2TK);
784B (5RK) Tractors 777B (4YC),
777C (4XJ),
785B (6HK),
789B (7EK),
793B (3SJ) Trucks;
5130 (7TJ, 5ZL),
5230 (7LL) Excavators

Reference: Special Instruction, SEHS9586, 3500 Electronic Unit Injection (EUI) Fuel Priming Procedure Special Instruction, SEHS9561, 3516 MUI to EUI Conversion For 789 Off-Highway Truck

Dry Start Priming Procedure

Perform the following procedure to ensure the engine is receiving sufficient fuel to start the engine.

1. Disconnect the fuel return line below (down stream) from the fuel pressure regulator.

2. Install the gauge/valve assembly.

3. Open valve and use the hand priming pump to fill the engine with fuel.

4. Continue to prime the engine until air is no longer visible in fuel. Some foam is acceptable (caused by the fuel pressure regulator).

5. Close the valve and use the hand priming pump to increase system pressure to 206 to 275 kPa (30 to 40 psi).

6. Wait approximately eight to ten minutes.

7. Open the valve.

8. Start the engine.

9. If the engine does not start after 2 or 3 attempts, repeat Steps 4 through 7.

10. Shut the engine off. Relieve fuel system pressure below (down stream) form the fuel pressure regulator.

11. Remove the gauge/valve assembly and connect the vehicle fuel return line.

Gauge/valve assembly. See the chart for item references.

Caterpillar Information System:

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1994/12/05 Hardened Spacers Used In Steer Pivot{4300,7051,7066}

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1994/12/05 New Differential Group Housing Used In The Output Gear Group{3159}

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1994/11/28 Improved Spring Used In Belt Tightener Groups{1358}

1994/11/28 Screened Filter For Implement Motor Case Drain Return Line{5720,4351,4921}

1994/11/28 New Front Axle Shims Make Adjustment Easier{3250}

1994/11/28 Radiator Mounting Bolt Damage{1353}

1994/11/28 Fixture Can Be Used To Simplify Challenger Radiator Support Installation.{1353}

1994/11/21 3054 And 3056 Machine Engine Fuel Injection Pump Service{1251}

1994/11/21 New Speed/Timing Sensor Provides Parts Commonality For Electronic Unit Injector (EUI) Engines{1907}

1994/12/12 Procedure For Measuring Oscillating Hitch Wear {7113,7114}

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

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1994/12/12 Serviceable Parts For Custom Option Engine Prelube Group{1319}

1994/12/12 New Exhaust Bypass Valve (Wastegate) Used In Exhaust Bypass Group{1057}

1994/12/12 New Cylinder Blocks Made From Stronger Alloy{1201}

1994/12/19 New Roller Bearings Used In The 8E-9034 Transmission Planetary Group To Improve Service Life {3160}

1994/12/19 Small Cracks Around The Holes In The Front Wheels Can Be Repaired By Welding {4201}

1994/12/19 New Screen Assembly Prevents Large Debris From Transferring Into Differential Compartment {4051,3258}

1994/12/19 Primary Pressure For The Transmission Pressure Control Group Has Been Increased {0374,3150}

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