This Kubota AV6500 Workshop Manual PDF runs 70 factory pages built for the AV1600, AV2500, AV3800, AV4500, AV5500, and AV6500 generators, OEM #9789701001. Nine wiring diagram pages map the ignition unit, auto idler, and oil-watching system, alongside troubleshooting charts and 8 pages of clearance specs. Exploded views cover the cylinder head group, spiral case, crankshaft, camshaft, connecting rod, and recoil starter, backed by 10 pages of step-by-step disassembly and servicing work. Torque the GH120 and GH170 cylinder head screws to 24.5-32.4 N·m, clean the fuel filter every 200 hours, and swap the air cleaner element once a year. No more cracking the case open on a hunch. Everything is bookmarked and searchable, so you jump straight to the wiring section or pull any torque number in seconds.
What's Inside This Kubota AV1600, AV2500, AV3800, AV4500, AV5500, AV6500 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 9-12 | - |
| Dimensions | 13-13 | - |
| Wiring Diagram | 14-22 | - |
| Mechanism | 23-28 | Feature (Engine Body, Oil Watching System, Auto Idler System, Auto Choke) |
| Disassembling and Servicing | 29-43 | General (Generator Identification, Lubricants and Fuel, Troubleshooting, Tightening Torques, Maintenance Check List, Check and Maintenance, Special Tools), External Component, Generator, Engine |
| External Components | 44-44 | - |
| Generator | 45-50 | Checking, Disassembling and Assembling, Servicing |
| Engine | 51-70 | Checking and Adjusting, Disassembling and Assembling (Cylinder Head Group and Cylinder Cowling, Spiral Case, Rotor and Ignition Unit, Crankcase Cover, Crankshaft, Camshaft, Connecting Rod, Piston and Oil Pump, Carburetor, Recoil Starter), Servicing (Engine Body, Lubricating System, Ignition System, Starting System, Auto Choke) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| AV1600, AV2500 | ||
| Cylinder Head Screws Torque (GH120, GH170) | 24.5 to 32.4 N·m | p. 37 |
| All Models | ||
| Air cleaner element replacement interval | Every year or every 6 times of cleaning | p. 38 |
| Fuel filter cleaning interval | Every 200 hours | p. 38 |
| Spark Plug Tightening Torque | 9.8 to 24.5 N·m | p. 37 |
| DC Output Voltage | 8 to 18 V | p. 45 |
| AV5500, AV6500 | ||
| Oil strainer cleaning interval (GH400 only) | Every 200 hours | p. 38 |
| Commutator O.D. (Allowable Limit) | 27.0 mm | p. 69 |
| Brush Length (Allowable Limit) | 6.0 mm | p. 69 |
| Engine Oil Capacity | 1.1 l | p. 10 |
| AV1600, AV2500, AV3800, AV4500 | ||
| Spark plug gap (GH120, GH170, GH250, GH280) | 0.6 to 0.7 mm | p. 40 |
| AV3800, AV4500, AV5500, AV6500 | ||
| Field Voltage (Checking under the no load) | 15 to 40 (V) D.C. | p. 46 |
| AV1600 | ||
| Engine Oil Capacity | 0.55 l | p. 9 |
Kubota AV1600, AV2500, AV3800, AV4500, AV5500, AV6500 Common Problems This Manual Covers
Kubota AV1600 cranks but won't start after sitting in storage, fires once then dies p. 36
Start with the no-fuel troubleshooting on page 36. Drain the stale fuel and clean the fuel filter, which the page 38 maintenance schedule lists for service every 200 hours. Bleed air from the lines, confirm the shutoff solenoid clicks when keyed on, then crank again.
Manual Section: Engine Does Not StartNo DC output to charge the starting battery, or DC voltage reads outside the normal range p. 45
Inspect the DC circuit for a defective diode or poor contact at the connectors. Measure DC output at the receptacle: a healthy unit reads between 8 and 18 volts per the generator checking section on page 45. Replace any diode that shows continuity in both directions and reseat loose terminals.
Manual Section: GeneratorEngine runs steady but the breaker trips or output voltage collapses when load is applied p. 36
Pull the air cleaner element first. A clogged filter starves the engine and drops speed the moment load hits. Clean or replace it; the page 38 schedule calls for replacement yearly or after six cleanings. From there, inspect the governor linkage for wear and confirm the breaker is sized for the actual load.
Manual Section: Engine Performance IssuesHard starting in cold weather, rough idle, or excessive exhaust smoke after long idle periods p. 37
Remove and inspect the spark plug for carbon fouling or a worn electrode, the usual cause of cold-weather hard starting. Clean or replace it, then torque it to 9.8 to 24.5 N-m per page 37. If smoke and rough running continue, check valve clearance and run a compression test against the engine's normal range.
Manual Section: Disassembling and ServicingLoud knocking or pinging noise from the engine, worse under load or when warm p. 36
Verify you are running the correct fuel grade and that oil viscosity is not too heavy for the temperature, since thick oil produces a knock-like rumble. Check the ignition coil air gap and reset it to 0.4 to 0.6 mm as specified on page 68. Inspect the combustion chamber for carbon buildup.
Manual Section: Engine Noise TroubleshootingFrequently Asked Questions
How do I reset a Kubota AV1600/AV2500/AV3800/AV4500/AV5500/AV6500 generator after a fault or low-oil shutdown?
On a low-oil shutdown, the oil watching system stops the engine on its own; top up the oil to the correct level to clear it. An overload fault leaves the circuit breaker (NFB) in the OFF position. Remove the cause of the overload or short circuit first, then switch the breaker back to ON.
What are the torque specs for the cylinder head, connecting rods, and main bearings on Kubota AV series engines?
On GH120/GH170 engines, cylinder head screw torque is 24.5 to 32.4 N-m and connecting rod screw torque is 13.7 to 19.6 N-m. GH400 engines call for 41.2 to 50.0 N-m on the cylinder head and 23.5 to 29.4 N-m on the connecting rod. The manual does not list a main bearing figure but does specify crankcase screw torque.
What does the error code or warning light mean on a Kubota AV4500 or AV5500 generator?
This manual lists no specific error codes. The one warning light to know is the Oil Lamp: it signals the engine oil has dropped below the specified level. Once it lights, the oil watching system shuts the engine down to protect it from damage.
How do I troubleshoot a Kubota AV series generator that cranks but will not start?
When the engine cranks but will not start, check first for lack of fuel and replenish if needed (page S-2). Next, inspect the ignition system for a defective spark plug or ignition unit (pages S-10, S-38). Also look at the carburetor for flooding fuel and confirm engine compression is not too low (page S-21).
What do I get after purchasing this Kubota AV1600, AV6500 manual?
Instant PDF download. The full 70-page searchable Workshop Manual is yours immediately after payment. Open it on a laptop, tablet, or phone right there in the shop.
Can I print specific sections of this Kubota AV1600, AV6500 Workshop Manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find wiring schematics in this Kubota AV1600, AV6500 manual?
Included. The Kubota AV1600, AV6500 Workshop Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
Document Quality
This is a scanned copy of the original workshop manual, and you can search the full text thanks to an underlying OCR layer. The text is generally clear and easy to read, though some tables show minor fading. Diagrams and illustrations are scanned raster images; most are clear, but some complex wiring diagrams have slightly soft lines and text that may require zooming in to read clearly. Pages are mostly clean with some minor scan artifacts like dark edges and occasional specks, and you will find several intentionally blank pages throughout the document.
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