Covers every diesel generator in Kubota's J-Series lineup: this 166-page Workshop Manual (OEM #9Y011-01945) addresses J106 through J324 variants across both 50Hz and 60Hz configurations, spanning Z482, D722, D1005, and V1305 engines. Inside: full wiring diagrams with AVR detector circuit, separate excitation unit, and emergency relay flow charts, plus exploded-view disassembly references. You get dedicated troubleshooting for generator and engine faults, tightening torque tables for both special and general-use fasteners, and step-by-step servicing procedures covering stator and rotor coils, fuel systems, cooling, and the electrical system. Torque the glow plugs to 7.8-14.7 N·m on Z482/D722 engines; tighten connecting rod screws to 26.5-30.4 N·m and swap your fuel filter every 400 hours. Generator down, site dark. Bookmarked for instant section jumps; search any spec and get back online fast.
What's Inside This Kubota J106–J324 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Record of Revisions | 3 | - |
| Safety Instructions | 4-7 | - |
| Specifications | 8-11 | For General (Model: J106, J108, J112, J116) |
| Dimensions | 12 | Model J106-Std, -Aus, J107-Std, -Sa, Model J108-Std, J110-Std |
| Mechanism | 13-45 | Generator (Structure, Automatic Voltage Regulator, Emergency Relay Circuit, Earth, Wiring Diagram), Emergency Relay Circuit (General) |
| Servicing | 46-165 | General (Precaution, Lubricants, Fuel And Coolant, Troubleshooting, Generator, Engine, Servicing Specifications, Engine [Z482, D722], Engine [D1005, V1305], Tightening Torques, Tightening Torques for Special Use Screws, Bolts and Nuts, Tightening Torques for General Use Screws, Maintenance Check List, Checking And Maintenance, Special Tools) |
| Contact Information | 166 | Editor, Address, Phone, Fax, E-mail, KUBOTA Corporation, Printed in Japan |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Z482, D722 | ||
| Rear bracket mounting screw torque | 24.5 to 34.3 N·m | p. 80 |
| Cylinder head cover cap nut torque | 3.9 to 5.9 N·m | p. 80 |
| Glow plug tightening torque | 7.8 to 14.7 N·m | p. 80 |
| Starter B terminal nut tightening torque | 8.8 to 11.8 N·m | p. 80 |
| All Models | ||
| Fuel filter cartridge replacement | Use a genuine KUBOTA filter cartridge or its equivalent | p. 85 |
| Fuel filter element replacement interval | Change every 400 hours | p. 87 |
| D1005, V1305 | ||
| Glow plug tightening torque | 7.8 to 14.7 N·m | p. 81 |
| Starter B terminal nut tightening torque | 8.8 to 11.8 N·m | p. 81 |
| J106-STD, J108-STD | ||
| Fuse box amperage | 15A, 10A, 5A, 3A | p. 23 |
| J112-STD | ||
| Slow blow fuse amperage | 50A | p. 24 |
| Z482 | ||
| Injection Timing | 0.36 to 0.40 rad. (20.5 to 22.5°) before T.D.C. | p. 72 |
| D722 | ||
| Injection Timing | 0.35 to 0.39 rad. (20 to 22°) before T.D.C. | p. 72 |
Kubota J106–J324 Series Common Problems This Manual Covers
Kubota J106-STD engine cranks but will not start or starts only after repeated attempts in cold weather. p. 73
Test glow plug resistance as shown on page 73. Measure each plug individually to verify the reading is approximately 0.9 Ω. Inspect the wiring harness for corrosion and confirm electrical continuity before attempting another cold start. Replace any plug showing an open circuit.
Manual Section: Engine: General Symptoms and SolutionsDiesel generator starts but immediately loses power, runs rough, or stalls out under heavy electrical load. p. 87
Inspect the fuel system for water contamination or flow restriction. Drain the tank and replace the fuel filter element, which requires a change every 400 hours according to page 87. Prime the fuel lines to remove air before restarting the unit.
Manual Section: Engine: General Symptoms and SolutionsOperator turns the key switch but experiences a no-crank or intermittent crank condition at the starter. p. 24
Inspect the starter circuit wiring for loose connections or corrosion. Test the slow blow fuse for continuity. If you are servicing a J112-STD model, verify the slow blow fuse amperage is exactly 50A as specified on page 24. Clean all battery terminals.
Manual Section: Electrical System: Starter Motor TestEngine performance drops noticeably after long periods of operation with heavy black exhaust smoke present. p. 86
Remove and inspect the air cleaner element for heavy dirt accumulation. Clean the element using compressed air, ensuring the air pressure at the nozzle must not exceed 690 kPa as directed on page 86. Replace the element if it remains restricted.
Manual Section: Engine: General Symptoms and SolutionsFrequently Asked Questions
What is the torque specification for Kubota J-series cylinder head bolts?
The torque specification for cylinder head screws varies by engine model. For Z482 and D722 engines, the tightening torque is 37.2 to 42.1 N·m (3.8 to 4.3 kgf·m, 28.0 to 31.7 ft-lbs). For D1005 and V1305 engines, the torque is 63.7 to 68.6 N·m (6.5 to 7.0 kgf·m, 47.0 to 50.6 ft-lbs).
How do I troubleshoot a Kubota J-series no-start condition?
To troubleshoot an engine no-start condition, check for probable causes such as no fuel, air or water in the fuel system, clogged fuel pipe or filter, excessively high viscosity of fuel, or incorrect injection timing. Solutions include replenishing fuel, venting air, cleaning or changing filters, using specified fuel, tightening retaining nuts, adjusting timing, or repairing/replacing components like the injection pump or nozzle holder. The maintenance check list also indicates changing the fuel filter element every 400 hours.
What are the replacement specifications for fuel filter?
To change the fuel filter element, first close the fuel cock (1), then remove the old element (2). Install the new fuel filter element by screwing it in by hand. It is important to check for fuel leaks after replacement. The maintenance check list specifies changing the fuel filter element every 400 hours.
What are the replacement specifications for glow plugs?
The glow plug resistance should be approximately 0.9 Ω. If the resistance is not within this factory specification, the glow plug is faulty and should be replaced. The tightening torque for glow plugs is 7.8 to 14.7 N·m (0.8 to 1.5 kgf·m, 5.8 to 10.8 ft-lbs).
What format is this Kubota J106–J324 Series manual in?
Immediate download of the complete 166-page searchable Workshop Manual. Access it on any device, laptop at your desk or phone in the field.
Are there any print restrictions on this Kubota J106–J324 Series manual?
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.
Can I find wiring schematics in this Kubota J106–J324 Series manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
Document Quality
This document is a scanned PDF with an OCR text layer, allowing you to search and copy the full text content. The text quality is consistently crisp and easy to read throughout the manual. Diagrams and illustrations are clear raster images, and their labels are fully legible. All pages are clean, free from scan artifacts, stains, or skewed content. There are no notable blank or filler pages.
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