Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the SQ-1120B-AU-B, SQ-1150B-AU-B, SQ-3140B-AU-B, SQ-3200B-AU-B and SQ-3300B-AU-B diesel generators, built around Kubota's D1703-EBG, V2203-EBG and V3300-EBG engines. It runs 181 pages in English (publication 9Y111-16030) with servicing specifications, tightening torques, checking procedures and troubleshooting.The manual is organized into Information, General, Engine, Generator and Servicing sections, covering the diesel powerplant and the generating end (stator, exciter, rotor and AVR). Owners, standby power installers and independent mechanics can diagnose no output and voltage faults, service the engine, set injection and valve specs and confirm the correct torque and capacity values for each SQ model. It downloads as a fully searchable PDF you can read on any device or print by section for field service.
What's Inside This Kubota SQ-Series Generators Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 3-12 | - |
| General | 13-38 | Handling Precautions for Electrical Parts and Wiring, Lubricants/Fuel/Coolant, Tightening Torques, Maintenance Check List |
| Servicing Specifications | 42-50 | Troubleshooting, D1703-EBG/V2203-EBG Specs, V3300-Ebg Specs, Injection Pump, Tightening Torques |
| Checking and Adjusting | 51-60 | Engine Body, Lubricating System, Cooling System/Fan Belt, Fuel System (Injection Pump/Nozzle), Electrical System (Starter/Glow Plug/Alternator) |
| Disassembling and Assembling | 61-85 | Fuel System, Lubricating System, Electrical System |
| V3300-Ebg Disassembly | 86-103 | Cylinder Head and Valves, Gear Case, Piston and Connecting Rod, Flywheel and Crankshaft, Injection Nozzle, Injection Pump Assembly |
| Engine Servicing | 104-109 | Cylinder Head Servicing Specs, Timing Gear and Camshaft Clearances |
| Piston and Connecting Rod | 110-115 | Piston Ring Clearance, Connecting Rod bend/twist, Pin Bore Wear Limits |
| Crankshaft | 116-124 | Cylinder Bore, Oil Pump, Crankshaft Journal Wear Limits, Bearing Clearances |
| Fuel Feed Pump | 125-132 | Starter, Oil Pump, Cylinder Bore, Alternator, Fuel Gauge |
| Generator | 133-159 | Generating Method (Principle of Operation), Structure (Stator, Exciter, Rotor, Avr), Avr Connection Diagram, Stator Coil Winding, Wiring Diagrams |
| Servicing | 160-181 | Engine Circuit Troubleshooting, External Component, Stator/Rotor/Exciter Coil Specs, Initial Excitation Method, Control Panel |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SQ-1120B-AU-B, SQ-3140B-AU-B | ||
| Engine oil capacity | 5.6 L | p. 22 |
| SQ-1150B-AU-B, SQ-3200B-AU-B | ||
| Engine oil capacity | 7.6 L | p. 22 |
| Cooling System Capacity | 7.4 L | p. 22 |
| SQ-1120B-AU-B | ||
| Generator Output | 11.2 kVA (11.2 kW) | p. 10 |
| SQ-3300B-AU-B | ||
| Generator Output | 30 kVA (24 kW) | p. 10 |
| Engine Oil Capacity | 13.2 L | p. 22 |
| All Models | ||
| M10 Bolt Tightening Torque (No-grade or 4T) | 40 to 45 N·m | p. 23 |
| Fuel Injection Nozzle Injection Pressure Factory Specification | 13.73 to 14.71 MPa | p. 49 |
| Alternator Regulating Voltage Factory Specification | 14.2 to 14.8 V | p. 50 |
| D1703-EBG, V2203-EBG | ||
| Cylinder Head Surface Flatness Allowable Limit | 0.05 mm | p. 45 |
| Valve Clearance Factory Specification | 0.18 to 0.22 mm | p. 45 |
| Starter Commutator O.D. Factory Specification | 30.0 mm | p. 50 |
Kubota SQ-Series Generators Common Problems This Manual Covers
No output or unstable voltage
A generator that produces no power or swings in voltage usually points to the AVR, exciter or rotor windings. The Generator section explains the generating principle and the structure of the stator, exciter, rotor and AVR for diagnosis.
Manual Section: Generator p. 133Hard starting or rough running
Slow starting or a rough idle on the D1703, V2203 or V3300 engine trace to fuel delivery or worn valves. The Engine section carries the injection nozzle pressure, valve clearance and servicing specifications.
Manual Section: Engine p. 39Low power or won't reach rated load
An engine that cannot hold rated speed under electrical load often has fuel injection or compression problems. The Engine section covers troubleshooting, servicing specifications and the checking procedures to trace it.
Manual Section: Engine p. 39Charging or regulator faults
A flat starting battery or out of range regulating voltage points to the alternator or regulator. The Engine section lists the alternator regulating voltage spec and starter checking procedures.
Manual Section: Engine p. 39Loose torque after service
Fasteners backed off after a rebuild cause leaks and vibration. The General section gives the tightening torque tables for general use screws, bolts and nuts, plus lubricant, fuel and coolant handling.
Manual Section: General p. 13Intermittent electrical circuit faults
Erratic controls or nuisance shutdowns often come down to wiring and circuit issues. The Servicing section includes engine circuit troubleshooting, servicing specifications and checking procedures.
Manual Section: Servicing p. 160Frequently Asked Questions
Which generators does this manual cover?
It covers five Kubota SQ diesel generators: the SQ-1120B-AU-B, SQ-1150B-AU-B, SQ-3140B-AU-B, SQ-3200B-AU-B and SQ-3300B-AU-B, with per model specifications where output and capacities differ.
Does it cover both the engine and the generator end?
Yes. Separate sections cover the Kubota diesel engine and the generating end, so you can service the powerplant and diagnose the stator, exciter, rotor and AVR from one manual.
Are engine servicing specifications and torques included?
Yes. The Engine section gives servicing specifications for the D1703-EBG, V2203-EBG and V3300-EBG, plus tightening torques, injection nozzle pressure and checking and adjusting procedures. p. 39
How quickly can I access this Kubota SQ-1120B-AU-B manual after buying?
Your 181-page searchable PDF is ready the moment checkout completes. Open it on a computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this manual?
None. Print as many copies as you like. Plenty of mechanics run off just the section they need and carry it onto the shop floor.
Can I find wiring schematics in this Kubota SQ-1120B-AU-B & variants manual?
It does. This Kubota SQ-1120B-AU-B and variants Workshop Manual carries full electrical wiring diagrams, wire routing, and connector pinouts.
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