Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the SQ-1120, SQ-1150, SQ-3140, SQ-3200, and SQ-3300 diesel generators in both STD and AUS versions, built around the D1703-EBG, V2203-EBG, and V3300-EBG engines. It is a 171 page PDF you download once and keep on any device.The manual is split between the generator end and the engine. You get specifications, dimensions, tightening torque tables, and a maintenance check list, followed by full disassembly and servicing for the stator, rotor, exciter, AVR, and control panel, then the engine body, lubricating, cooling, fuel, and electrical systems.With it you can chase down voltage faults, service the injection pump and nozzles, set valve clearances, and work through the factory troubleshooting charts with the correct clearances and torque figures in hand.
What's Inside This Kubota SQ-Series Generators Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | 3-6 | Safety First, Before Servicing and Repairing, Safety Starting, Safety Working, Avoid Fires, Ventilate Work Area, Prevent Acid Burns, Dispose of Fluids Properly |
| Specifications | 7-10 | Sq-1120-Std, Sq-1150-Std, Sq-3140-Std Specifications, Sq-3200-Std, Sq-3300-Std Specifications, Sq-1120-Aus, Sq-1150-Aus, Sq-3140-Aus Specifications |
| Dimensions | 11 | Dimensions Overview, Generator Dimensions Diagram, Model Dimensions Table |
| Servicing General | 46-55 | General Identification, Lubricants, Fuel and Coolant, Troubleshooting |
| Tightening Torques | 69 | Tightening Torques Overview, Tightening Torques for Special Use Screws, Bolts and Nuts, Tightening Torque Table |
| Maintenance Check List | 70 | Maintenance Check List Overview, Service Interval Table, Maintenance Schedule |
| Check and Maintenance | 71-73 | Check Points of Daily, Check Points of Initial 50 Hours, Check Points of Every 100 Hours, Check Points of Every 200 Hours, Check Points of Every 400 Hours |
| Special Tools | 74-84 | Valve Seat Cutter Set, Diesel Engine Compression Tester, Oil Pressure Tester, Press Gauge, Special-Use Puller Set, Connecting Rod Alignment Tool, Red Check, Flywheel Puller |
| Generator Disassembling and Assembling | 85-86 | External Component, Cover, Panel, Control Panel and Bonnet, Generator, End Bracket, Stator Assembly |
| Generator Servicing | 87-93 | Terminal Voltage for Each Part During Normal Periods, Stator Coil, Rotor Coil, Exciter Coil, Initial Excitation Method, Control Panel, Emergency Relay Activates |
| Engine Body | 94-147 | Checking and Adjusting, Disassembling and Assembling, Servicing |
| Lubricating System | 148-150 | Checking, Disassembling and Assembling, Servicing |
| Cooling System | 151-153 | Checking (Fan Belt, Radiator, Thermostat), Disassembling and Assembling (D1703 V2203, V3300) |
| Fuel System | 154-158 | Checking and Adjusting (Injection: Pump, Nozzle), Disassembling and Assembling (Injection: Nozzle, Pump Assembly) |
| Electrical System | 159-171 | Checking, Disassembling and Assembling, Servicing |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Standard Screw and Bolt (Grade 4) M6 | 7.9 to 9.3 N-m | p. 70 |
| Standard Screw and Bolt (Grade 4) M8 | 17.7 to 20.6 N-m | p. 70 |
| Engine oil checking interval | Daily | p. 70 |
| Engine oil changing interval | Initial 50 hours, Every 200 hours | p. 70 |
| Generator Frequency | 50 Hz | p. 7 |
| Regulated Voltage Value | 1.5 % | p. 56 |
| Cylinder Head Surface Flatness Allowable Limit | 0.05 mm | p. 58 |
| Camshaft Alignment Allowable Limit | 0.01 mm | p. 61 |
| SQ-1120-STD, SQ-1120-AUS, SQ-3140-STD, SQ-3140-AUS | ||
| Engine oil capacity | 5.6 L (5.92 U.S.qts., 4.93 Imp.qts.) | p. 47 |
| SQ-1150-STD, SQ-1150-AUS, SQ-3200-STD, SQ-3200-AUS | ||
| Engine oil capacity | 7.6 L (8.03 U.S.qts., 6.69 Imp.qts.) | p. 47 |
| D1703-EBG, V2203-EBG | ||
| Compression Pressure Allowable Limit | 2.55 MPa / 250 rpm | p. 58 |
| Valve Clearance Factory Spec | 0.18 to 0.22 mm | p. 58 |
Kubota SQ-Series Generators Common Problems This Manual Covers
Low or unstable output voltage
Voltage faults on these sets are traced through the stator, rotor, and exciter coils and the AVR. The generator servicing section gives the terminal voltages and coil checks.
Manual Section: Generator Servicing p. 87Generator will not build voltage
When the set turns but makes no output, the troubleshooting charts separate a voltage fault from an engine circuit fault before you start replacing parts.
Manual Section: Servicing General p. 46Hard starting or fuel starvation
Diesel starting trouble is worked through the fuel system, checking and servicing the injection pump and nozzles.
Manual Section: Fuel System p. 154Engine overheating
Overheating is chased through the cooling system, with fan belt, radiator, and thermostat checks for the D1703, V2203, and V3300 engines.
Manual Section: Cooling System p. 151Low oil pressure
Falling oil pressure points to the lubricating system, which the manual covers for checking, disassembly, and servicing.
Manual Section: Lubricating System p. 148No charging or electrical faults
Charging and control wiring problems are diagnosed in the electrical system section covering checking and servicing.
Manual Section: Electrical System p. 159Loss of compression or valve trouble
Weak compression and valve issues are handled in the engine body section, with the checking, adjusting, and servicing procedures and factory limits.
Manual Section: Engine Body p. 94Frequently Asked Questions
Which generators and engines does this cover?
It covers the Kubota SQ-1120, SQ-1150, SQ-3140, SQ-3200, and SQ-3300 diesel generators in STD and AUS versions, powered by the D1703-EBG, V2203-EBG, and V3300-EBG engines.
Does it include tightening torque specifications?
Yes. The Tightening Torques section gives the torque table for standard and special use screws, bolts, and nuts, plus key fasteners like the cylinder head, connecting rod, and flywheel screws. p. 69
Does it cover the generator head as well as the engine?
Yes. Generator servicing covers the stator, rotor, exciter, AVR, control panel, and emergency relay, while separate sections handle the engine body, fuel, cooling, lubricating, and electrical systems. p. 87
Is there a maintenance schedule?
Yes. The maintenance check list sets service intervals, and the check and maintenance section details the daily, 50, 100, 200, and 400 hour service points. p. 70
How quickly can I access this Kubota SQ-1120-STD & variants manual after buying?
You get a 171-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, bring it right to the shop floor.
Is this Kubota SQ-1120-STD & variants Workshop Manual printable?
None at all, the PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this Kubota SQ-1120-STD & variants manual include wiring diagrams?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Kubota SQ-1120-STD & variants.
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