Service parts for the 3500iO
Grouped by system, with how many of each the parts manual calls for.
Ignition
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Frequency | 60.0 Hz |
|---|---|
| Prime power | 3000 kW |
| Oil capacity | 0.6 L |
| Voltage options | 120 V |
| Phase | monophase |
| Rated current | 25 A |
| Dimensions (L×W×H) | 490×430×417 mm |
| Dry weight | 34 kg |
| Fuel tank | 9.0 L |
Maintenance & consumables
for the Generac 3500iO| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Filtro de aire | — | |||
| Fuel filter | — | 100 hr | |||
| Oil filter | — | 100 hr | |||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Coolant filter | — | ||||
| Hydraulic filter | — | ||||
| Oil | 0.6 L | — | 100 hr | ||
| Spark plug | 0J00620106 | 300 hr | Amazon eBay $35.00 NAPA $2.82 FridayParts $32.07 |
Service intervals
11| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Engine oil level | Check | 8 hr | At Each Use / every 8 hours of operation | |
| Engine oil | Change | 100 hr | 6 mo | First service — First oil change after first month or 20 hours of operation |
| Spark arrestor | Clean | 50 hr | Every 50 hours of operation or every season, whichever comes first | |
| Air filter | Clean | 100 hr | 6 mo | Every 100 Hours or Every 6 Months |
| Spark arrestor / muffler screen | Clean | 100 hr | 6 mo | Every 100 Hours or Every 6 Months |
| Crankcase breather hose | Check | 300 hr | Every 300 Hours or Every Season | |
| Cylinder head | Check | 300 hr | Every 300 Hours or Every Season; performed by IASD | |
| Fittings/fasteners | Check | 300 hr | Every 300 Hours or Every Season; performed by IASD | |
| Fuel filter | Replace | 300 hr | Every 300 Hours or Every Season; performed by IASD | |
| Spark plug | Replace | 300 hr | Every 300 Hours or Every Season | |
| Valve clearance | Adjust | 300 hr | First service — Every 300 Hours or Every Season |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
3| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Exhaust valve clearance | 0.10 ± 0.02 | mm (0.004" ± 0.001") | cold |
| Clearance | Intake valve clearance | 0.10 ± 0.02 | mm (0.004" ± 0.001") | cold |
| Gap | Spark plug gap | 0.024-0.028 | in (0.6-0.7 mm) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Engine oil | SAE 30 / 10W-30 / Synthetic 5W-30 (by climate) | 0.6 L (0.6 qt.) | |||
| Fuel | Unleaded gasoline | 9.0 L (2.37 U.S. gallons) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
6Change Engine Oil maintenance
⚠ Allow engine to cool before draining oil
⚠ Disconnect spark plug wires when working on unit
Tools: funnel
- Place generator on a level surface
- Disconnect spark plug wire from spark plug
- Clean area around oil fill and oil drain plug
- Remove oil fill cap and wipe dipstick clean
- Tip unit and drain oil completely into a suitable container
- Tip unit back to level position
- Insert funnel into oil fill opening, add recommended engine oil
- Check oil level with dipstick, adjust to safe operating range
- Replace oil fill cap and hand-tighten
- Wipe up spilled oil
- Dispose of oil properly
Clean Spark Arrestor Screen maintenance
⚠ Do not touch hot surfaces
- Remove clamp to remove retainer
- Slide spark arrestor screens out from the muffler outlet tube
- Inspect screens, replace if torn, perforated, or damaged; clean with commercial solvent if not damaged
- Replace screens and retainer, secure with clamp
Inspect Engine Oil Level maintenance
- Place generator on a level surface
- Clean area around oil fill and oil drain plug
- Remove oil fill cap and wipe dipstick clean
- Insert dipstick into oil filler neck without screwing it in
- Remove dipstick and verify oil level is within safe operating range
- Add recommended engine oil as necessary
- Replace oil fill cap and hand-tighten
Prepare Fuel System/Engine for Storage maintenance
⚠ Eye protection required to avoid spray from spark plug hole when cranking engine
⚠ Store fuel in a well ventilated area, away from fire and sparks
- Add fuel stabilizer, run engine 10-15 minutes to circulate stabilizer (fuel can then be stored up to 24 months)
- If not stabilized, drain fuel into approved container, run engine until it stops from lack of fuel
- Change engine oil
- Remove spark plug
- Pour tablespoon (5-10cc) of clean engine oil or spray fogging agent into cylinder
- Pull starter recoil several times to distribute oil
- Install spark plug
- Pull recoil slowly until resistance is felt, then gently release
Service Air Filter maintenance
- Unscrew bolt and remove air filter cover
- Wash filter in soapy water, squeeze dry in clean cloth (do not twist)
- Clean air filter cover before installation
- Replace side cover and screws
Service Spark Plug maintenance
⚠ Replace spark plug if electrodes are pitted, burned or porcelain is cracked
Tools: wire feeler gauge, spark plug wrench
- Remove spark plug cover
- Clean area around spark plug
- Remove and inspect spark plug
- Inspect electrode gap with wire feeler gauge, reset gap to 0.6-0.7 mm (0.024-0.028 in)
- Install spark plug finger tight, tighten additional 3/8 to 1/2 turn with spark plug wrench
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 engine is in the Generac 3500iO?
The Generac 3500iO is powered by the Generac 3500iO engine.
How much oil does the Generac 3500iO take?
The Generac 3500iO engine in the Generac 3500iO has an oil capacity of 0.6 liters.
How much does the Generac 3500iO weigh?
The Generac 3500iO has a dry weight of 34 kg (74 lb).
How big is the fuel tank on the Generac 3500iO?
The Generac 3500iO has a 9 liter (2 US gallon) fuel tank.
What voltages is the Generac 3500iO available in?
The Generac 3500iO is offered in 120 V, monophase-phase.
Repair guides
6- Change Engine Oil
- Clean Spark Arrestor Screen
- Inspect Engine Oil Level
- Prepare Fuel System/Engine for Storage
- Service Air Filter
- Service Spark Plug
Step-by-step procedures compiled from the Generac service manual for this model.
Parts
1| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 0J00620106 | Spark Plug | 1 | Spark plug | Amazon eBay $35.00 NAPA $2.82 FridayParts $32.07 |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
This page was generated from the 2 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.