Cummins/Onan EGMBT (P4500) Engine

1. Remove the fuel tank.
2. Loosen the nut on the governor arm pinch bolt.
3. Move the arm until the throttle is completely open and hold it in that position.
4. Rotate the governor arm shaft as far as it will go in the same direction and tighten the pinch bolt.
5. Check that the arm and throttle move smoothly.
6. Reinstall the fuel tank.
7. Start the engine and let it warm up; adjust the limiting screw to set the idle speed.

⚠ Valve clearance inspection and adjustment must be performed with the engine cold.

Tools: Feeler gauge

1. Remove the valve cover and set the piston at top dead center of the compression stroke.
2. Insert a feeler gauge between the rocker arm and valve to measure valve clearance.
3. If adjustment is necessary, hold the rocker arm pivot and loosen the pivot lock nut.
4. Turn the rocker arm pivot to obtain the specified clearance.
5. Retighten the lock nut while holding the rocker arm pivot.
6. Recheck valve clearance after tightening the lock nut.

⚠ The generator set is heavy. Keep feet and hands clear when lifting.

⚠ Too little oil can cause severe engine damage.

⚠ Do not use gasoline or additives containing methanol.

1. Remove the generator set from the box.
2. If necessary, install the wheel kit.
3. Add oil to the generator set; keep level above the Add mark.
4. Add gasoline to the fuel tank.
5. Install a 12 volt, 14L-A2 battery; connect positive (+) red cable first, then negative (-) green cable.

⚠ Do not turn the generator set on the side, top, or end.

⚠ Do not place items on top of the generator set.

Tools: 10 and 12 mm wrenches, sockets, and ratchet, Three 6-inch high blocks of wood, Pliers

1. Install the handle assembly with two long bolts; do not crush the frame tube.
2. Block up the generator set under both frame tubes and under the exhaust-end cross-member.
3. Install a leg assembly on each side of the exhaust end cross-member.
4. Remove rubber pads; install the wheels with the long hub to the inside.
5. Reinstall the washers and cotter pins on the axle; bend one leg of each cotter pin.
6. Place axle assembly under the cross member, install four bolts and nuts, tighten securely.

1. Remove the cleaner cover by unsnapping the two spring clips.
2. Remove the two foam filter elements and wash them thoroughly with soap and water. Let them dry thoroughly.
3. Knead in 1 teaspoon (5 cm3) of clean engine oil into each foam filter element.
4. Reinstall the filter elements, the gray filter first (finer pores) then the black filter (larger pores).
5. Secure the cover with the spring clips.

⚠ Only use soapy water or a nonflammable solvent for cleaning components.

⚠ Never run the engine without the air cleaner installed.

1. Remove the filter cover by unsnapping the two spring clips.
2. Remove the two foam filter elements and thoroughly wash with soap and water; let dry.
3. Knead in 1 teaspoon (5 cm3) of clean engine oil into each foam filter element.
4. Reinstall the gray filter first (finer pores), then the black filter (larger pores).
5. Secure the cover with the spring clips.

⚠ Arcing at battery terminals can ignite battery gases causing severe personal injury. Ventilate the area, wear safety glasses, do not smoke.

⚠ If used before a starting battery is installed, insulate the red battery cable terminal with electrical insulating tape to prevent short circuits.

1. Keep the battery case clean and dry and the terminals tight.
2. Connect the Red starter cable (+) to the positive terminal and the Green cable to the negative terminal.
3. Always disconnect the Green cable (–) first and reconnect it last.
4. Make sure the battery is securely clamped in place in its mounting bracket.

⚠ Connect the blue wire lead to the positive (+) side of the brush holder.

1. Remove the end cap and the brush block mounting screw, then remove the brush block.
2. Check the brush for length, wear, or other defect; replace if less than 5 mm (0.20 in).
3. Visually inspect the slip rings for dust, rust, or damage; wipe with a clean lint-free cloth if necessary.
4. If rusted or damaged, remove the rotor and rub with fine emery cloth.

⚠ Contact with used engine oil can cause cancer and reproductive toxicity. Avoid skin contact and breathing of vapors.

1. Remove the oil fill cap and drain plug.
2. Drain the oil from the crankcase while the engine is still warm.
3. Reinstall the drain plug securely and torque to 20-25 N·m (14.5-18.1 lb-ft).
4. Add new oil up to the bottom edge of the oil fill hole with engine stopped and level.
5. Reinstall the oil fill cap and tighten it securely.

⚠ Wear safety glasses to protect your eyes from flying debris when cleaning with compressed air.

⚠ Cleaning with a pressure washer can cause damage by shorting the generator and other electrical components.

Tools: Damp cloth, Compressed air (optional), Safety glasses

1. Remove spilled oil and fuel immediately with a dry rag and dispose of rags properly.
2. Use a damp cloth to clean dust and dirt from the generator set.
3. Do not use cleaning solvents, which can damage electrical components.
4. Wear safety glasses if using compressed air to clean the engine cooling fins.
5. Do not use a pressure washer.

⚠ Contact with a hot muffler can cause severe burns. Allow the generator set to cool before servicing the muffler.

Tools: Wire brush

1. Let the generator set cool down.
2. Remove the spark arrester screen.
3. Inspect for damage and replace if defective.
4. Lightly tap the screen and clean any deposits with a wire brush.
5. Reinstall the spark arrester and tighten the screw securely.

⚠ A hot muffler can cause severe burns. Allow the generator set to cool before servicing the muffler.

Tools: Wire brush

1. Allow the generator set to cool down.
2. Remove the spark arrestor screen (Figure 12).
3. Inspect for damage and replace if defective.
4. To clean, lightly tap the screen and clean any deposits with a wire brush.