Cummins/Onan Onan Engine

⚠ Must be done when engine is cold

Tools: feeler gauge

1. Remove rocker arm cover and carefully remove gasket, replace if torn or damaged
2. Remove spark plug so engine can be rotated more easily
3. Rotate engine to top dead center (TDC) of compression stroke
4. Confirm both rocker arms are loose at TDC on compression stroke; if not, rotate engine 360 degrees
5. Insert feeler gauge between rocker arm and push rod to check clearance
6. If adjustment required, hold adjusting nut and loosen jam nut
7. Turn adjusting nut to obtain correct valve lash
8. Hold adjusting nut and tighten jam nut to 106 in-lb (12 N.m)
9. Recheck valve lash after tightening jam nut
10. Perform for both intake and exhaust valves
11. Install rocker arm cover, gasket and spark plug

⚠ Adjusting engine speed above equipment manufacturer's specification could cause equipment to operate at speeds in violation of Federal and State Standards for Safety.

⚠ Moving parts can cause severe personal injury or death. Take care when measuring engine speed with tachometer. Must be qualified mechanic.

Tools: Accurate tachometer

1. Adjust only by qualified mechanic using accurate tachometer.
2. Set low-idle and high-idle speeds to values in equipment Operator's Manual. If absent, adjust low-idle to 1400 RPM and high-idle to 3400 RPM.
3. Start engine and move throttle lever to lowest speed position.
4. Adjust low-idle speed stop screw on carburetor to obtain specified low-idle speed.
5. For cable controlled engines: move throttle lever to highest speed position. Loosen high-idle speed stop plate clamping screw and rotate stop plate while holding throttle control arm against it until
6. For lever controlled engines: adjust lever stop screw while holding throttle lever against it until specified high-idle speed is obtained.
7. Check for full, smooth movement of throttle control arm between stop positions.

⚠ Accidental starting can cause severe injury or death. Always disconnect spark plug and battery before resetting engine control cables.

1. Stop engine and disconnect spark plug and battery (negative cable).
2. Push choke knob in to full open-choke position and throttle lever to lowest speed position.
3. Loosen cable clamp at engine bracket if necessary and hook cable wires into hook holes in choke and throttle control arms.
4. Rotate choke and throttle control arms clockwise, hold against stops, pull slack out of cables and tighten cable clamp.
5. Check for smooth movement and full travel of choke knob and throttle lever. Remove air cleaner element to see choke plate opens and closes fully. Check throttle control arm touches stop plate and thro
6. Reassemble air cleaner and reconnect spark plug and battery.

⚠ Checking and adjusting valve clearance must be done when the engine is cold.

Tools: feeler gauge

1. Remove the rocker arm cover and carefully remove the gasket.
2. Remove the spark plug so the engine can be rotated more easily.
3. Rotate the engine to top dead center (TDC) by pulling the recoil handle slowly.
4. Both rocker arms should be loose at TDC on the compression stroke.
5. Insert a feeler gauge between the rocker arm and valve stem to measure clearance.
6. If adjustment is necessary, hold the rocker arm pivot and loosen the pivot adjusting nut.
7. Turn the rocker arm pivot to obtain the specified clearance.
8. Hold the pivot and re-tighten the pivot adjusting nut to the specified torque.
9. Perform this procedure for the other valve.
10. Install the gasket, rocker arm cover, and spark plug.

⚠ DO NOT use thread seal tape or any other sealant on the LPG/propane hose connection.

Tools: 19 mm or adjustable wrench

1. Turn the generator OFF and place on a flat surface in a well ventilated area.
2. Verify the propane tank valve is fully closed.
3. Remove the cover on the generator propane inlet valve.
4. Hand thread the LPG/propane hose to the propane inlet on the generator.
5. Tighten the hose connector with a 19 mm or adjustable wrench. Do not over-tighten.
6. Remove the safety plug or cap from the propane tank valve.
7. Attach the other end of the hose to the tank and hand tighten.
8. Open the propane tank valve fully and check all connections for leaks with soapy water.

1. Push down the battery access cover tab and pull the cover forward to remove it.
2. Verify the rubber battery strap firmly secures the battery in place.
3. Remove the cable tie securing the quick-connect plugs.
4. Push firmly to connect the quick-connect plugs.
5. Align the tabs on the cover and push to reinstall the cover.

⚠ Failure to adequately wring out excess oil from wrapper may cause a drop in engine power due to restriction of inlet air.

⚠ Replace foam wrapper when torn or stretched.

1. Remove outer cover by rotating quarter-turn fastener counterclockwise, then lift cover.
2. To service foam wrapper only, do not remove inner air cleaner cover. Remove and wash foam wrapper in water and detergent.
3. Squeeze foam wrapper dry like a sponge. Rinse with clean water and allow to dry.
4. Coat wrapper evenly with one tablespoon (14 grams) of SAE 30 engine oil. Knead oil in and wring out excess.
5. Install foam wrapper over paper air cleaner element by stretching it over inner cover. Completely cover all exposed paper pleats.
6. For element replacement: pull choke knob to full-choke to close choke plate. Remove outer cover and wipe away loose dust.
7. Remove mounting nut, inner cover and air cleaner element. Wipe off dust from air cleaner base.
8. Install new paper element and secure with inner cover and mounting nut. Tighten nut 1-1/2 turns after seating it on cover.
9. Reinstall foam wrapper and outer cover.

⚠ NEVER use gasoline or other flammable solvents to clean the air filter.

1. Place generator on a level surface and allow engine to cool several minutes.
2. Remove the engine service cover.
3. Turn the air cleaner cover knobs to unlocked and tip the cover down to remove.
4. Wash the foam air filter in household detergent soap and warm water.
5. Rinse by submerging in fresh water; allow to dry thoroughly.
6. Dip the foam filter in clean engine oil and squeeze out excess.
7. Install the foam air filter and lock the air cleaner cover.
8. Install the engine service cover.

⚠ The supplied battery charger is not a trickle charger; DO NOT use for more than 8 hours.

1. Plug the charger into the battery charging port on the control panel.
2. Plug the wall receptacle end into a 120 Volt AC wall outlet.
3. Unplug the battery charger from wall outlet and control panel jack after 8 hours of charging.

⚠ Burn hazard. The battery contains sulfuric acid (electrolyte) which is highly corrosive and poisonous.

1. Remove the battery access cover.
2. Remove the quick-connect plug and the battery strap; remove the battery.
3. Disconnect the quick-disconnect cable leads from the battery.
4. Connect the white (-) quick-connect cable to the negative terminal; slide boot over connection.
5. Connect the red (+) quick-connect cable to the positive terminal; slide boot over connection.
6. Install the battery into the generator and secure the battery strap.
7. Connect the quick-connect plug and install the battery access cover.

⚠ Never dispose of used oil into sewer, ground, or waterways

Tools: oil pan

1. Operate or maintain generator on flat surface
2. Stop engine
3. Let engine cool for several minutes
4. Place oil pan under oil drain plug
5. Clean around oil drain plug with damp rag
6. Remove oil drain plug
7. Allow oil to completely drain
8. Replace oil drain plug
9. Fill crankcase with oil per Adding Engine Oil procedure

⚠ Internal pressure can build in crankcase while running; allow oil to cool before removing dipstick

1. Operate or maintain generator on flat surface
2. Stop engine if running
3. Let engine cool for several minutes
4. Clean around oil fill plug/dipstick with damp rag
5. Remove oil fill plug/dipstick
6. Thread dipstick all the way back in, remove and check oil level between H and L lines