The Cummins/Onan EH65D is a 0.65 L 2-cylinder air-cooled engine. It powers generator sets from Cummins/Onan, including the PX12000e and RGV12 CSA_US_GU2001. It holds 1.55 L (0.4 gal) of oil.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Air filter | | | — | 50 hr | |
| Fuel filter | | | — | | |
| Oil filter | | | — | 20 hr | |
| Battery | Lead-acid battery : A capacity of 12V-32A・h or larger. For the generators used in low temperature (below -5℃), 12V-40A・h or larger battery is recommended. | | — | 500 hr | |
| Belt | | | — | | |
| Coolant | | | — | | |
| Oil | API service class SE or higher grade (SG, SH or SJ is recommended) | 1.55 liters | — | 20 hr | |
| Spark plug | | | — | 200 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Procedures
12Battery Installation installation
⚠ Disconnect battery cables when charging battery.
⚠ Turn the starter switch to the STOP position when mounting or dismounting battery.
⚠ Connect positive (+) terminal first when mounting, disconnect negative (-) terminal first when dismounting.
- Attach terminals to a lead-acid battery already charged and mount it with its terminals facing inward.
- Insert each long bolt through the specified hole, its tip pointing outward.
- Put the supporting arm on the long bolts and tighten with the butterfly nuts.
- Arrange the wiring so that it won't be damaged by engine vibration.
- With the starter key in the OFF position, connect the red cable to the positive (+) terminal, then the other cable to the negative (-) terminal.
Connecting to Domestic Circuit (House Wiring) installation
⚠ All connections must be made by a licensed electrician.
⚠ Failure in connection may result in death, personal injury, damage to generator, damage to appliances, damage to building's wiring or fire.
⚠ Do not connect the generator to a commercial power line.
- When connecting the generator to house wiring, take generator output power from the 240V-4P receptacle.
- Install a transfer switch of the correct capacity between the meter and the fuse or AC breaker box.
- If the neutral wire of house wiring is grounded, be sure to ground the ground terminal of the generator.
- Turn the house AC breaker off before starting the generator.
- Start the generator and warm it up, then turn the house AC breaker on.
How-To Install the Wheel installation
Tools: Hoist or square bar (4 in by 4 in, length 27.6 in), Plier, Spanner or socket wrench (12mm), 2 units
- Raise the generator by about 4 inches with a hoist or with a square bar put under the bottom panel.
- Attach wheel mounting parts, stopper and wheel to the wheel shaft using the clamp; check the wheel rotates smoothly (use grease if needed).
- Bend the tip of the part according to the shape of the wheel shaft as possible.
- Attach the assembled shaft to the foundation plate of the engine.
- Attach the other shaft to the foundation plate of the generating unit.
Checking Carbon Brush maintenance
- Remove the brush cover.
- Disconnect the wire connector and remove the brush.
- Replace the brush with a new one if it is 5 mm (0.2 in.) long or less.
- Note the brush direction and relative position with the slip ring and install the new brush correctly.
Cleaning Fuel Strainer maintenance
⚠ Gasoline is flammable; do not smoke or use open flame.
- Remove the strainer cup and throw away water and dirt.
- Clean the screen and strainer cup with gasoline.
- Tightly fasten the cup to main body, making sure to avoid fuel leak.
Cleaning and Adjusting Spark Plug maintenance
Tools: supplied plug wrench and handle
- Unplug the high-voltage cables.
- Using the supplied plug wrench and handle, turn the plug counterclockwise until it comes off.
- Clean the area around the mounting hole and clean the electrodes if dirty.
- Adjust the clearance to 0.03 in. (0.7-0.8 mm); replace the plug if the projection is worn flat.
- Attach and tighten the plug to 25 to 30 Nm (19 to 22 lbs/ft).
- Check the plug cap contact area for corrosion and connect the high-voltage cables.
Engine Oil Change maintenance
⚠ Check for a suitable way to dispose of old oil; do not pour into sewage drains, garden soil or open streams.
- Stop the engine and place generator on a stable and level surface.
- Loosen the drain plug and drain the oil.
- Re-install the drain plug before refilling oil.
- Refill with recommended oil to the upper level.
Engine Oil Filter Replacement maintenance
⚠ Pay attention to spilled hot engine oil when replacing the engine oil filter.
Tools: wrench
- Drain the engine oil.
- Apply oil to the new oil filter O-ring.
- Attach the oil filter in position and tighten 2/3 turns by hand or with wrench after the O-ring touches the sealing surface.
- Run the engine for a minute, stop the engine and check for oil leakage around the oil filter.
- Recheck the oil level.
Preparation for Storage maintenance
⚠ NEVER USE WATER TO CLEAN GENERATOR.
- Drain fuel from fuel tank and strainer cup carefully by disconnecting the fuel line.
- Run the engine at no-load until it stops to remove fuel in the carburetor.
- Disconnect the terminal of the battery.
- Change engine oil.
- Check for loose bolts and screws, tighten them if necessary.
- Clean generator thoroughly with oiled cloth; never use water to clean generator.
- Store generator in a well ventilated, low humidity area.
Servicing Air Cleaner maintenance
- Remove the knob and air cleaner cover.
- Remove the paper inner element and urethane foam outer element.
- Wash and clean the urethane foam in kerosene; saturate in 3 parts kerosene and 1 part engine oil, then squeeze out excess oil.
- Clean the paper element by tapping gently to remove dirt and blowing off dust; never use oil.
- Set the elements on the air cleaner base with the grommet in position and install the cover with knob tightened securely.
Spark Arrester Removal and Cleaning maintenance
⚠ Always use the product with a spark arrester.
⚠ If the engine has been running, the muffler and spark arrester will be very hot; allow the muffler to cool before cleaning.
Tools: brush
- Remove the flange bolts from the muffler cover and remove the muffler cover.
- Remove the special screw from the spark arrester and remove the spark arrester from the muffler.
- Use a brush to remove carbon deposits from the spark arrester screen; avoid damaging the screen.
- Replace the spark arrester if it is damaged (must be free of breaks and holes).
- Install the spark arrester and muffler protector in the reverse order of disassembly.
Starting the Engine operation
⚠ Do not start the generator with electrical appliances connected and switched on.
- Check the oil level before each operation and perform the specified Daily Inspection.
- Make sure that the no-fuse breaker is off.
- Turn the fuel cock to the vertical (open) position.
- Turn the starter switch to the START position.
- If the engine won't start, turn the switch back to ON and wait approximately 10 seconds before trying again.
- Warm the engine up for a minute or two before connecting loads.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the oil capacity of the Cummins/Onan EH65D?
The Cummins/Onan EH65D engine has an oil capacity of 1.55 liters.
What is the displacement of the Cummins/Onan EH65D?
The Cummins/Onan EH65D has a displacement of 0.653 liters with 2 cylinders.
Which generators use the Cummins/Onan EH65D engine?
The Cummins/Onan EH65D powers 2 generator set(s), including Cummins/Onan PX12000e, Cummins/Onan RGV12 CSA_US_GU2001.
How often should you change the oil in the Cummins/Onan EH65D?
The Cummins/Onan EH65D oil change interval is every 20 hours.
What is a common problem with the Cummins/Onan EH65D engine?
A commonly reported issue on generators using the Cummins/Onan EH65D is: Generator engine fails to start after several attempts, or if no electricity is available at the output receptacles. Cause: Possible causes include: Low battery; Blown fuse; Deteriorated fuel; Fuel piping clogging; Clogging of Air cleaner; Clogging of Cooling air intake; Low oil level; Faulty spark plug; Overload by connected appliance; Incorrect or poor connection of wires; Insufficient capacity of extension cable; Starter won't run; Leakage.