Kubota GL7000 - User Manual

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WORKSHOP MANUAL

DIESEL GENERATOR

GL6000,GL7000,

GL9000,GL11000

KiSC issued 05, 2015 A

Table of Contents

Questions and Answers

T
Tanya BrownAug 20, 2025
Why is my Kubota Portable Generator emitting black exhaust?
- A
  Ashley WarrenAug 20, 2025
  If your Kubota Portable Generator is emitting black or dark gray exhaust gas, it could be due to several reasons. The generator might be overloaded, so reduce the load. Using low-grade or unsuitable fuel can also cause this issue, so switch to the specified fuel. A clogged fuel filter or air cleaner could be the culprit; replace or clean them, respectively. Finally, deficient nozzle injection can lead to this problem, requiring you to repair or replace the nozzle.
C
Courtney PetersonAug 23, 2025
How to fix a Kubota Portable Generator with unsmooth engine revolution?
- B
  Brittany TranAug 23, 2025
  If your Kubota Portable Generator's engine revolution isn't smooth, several factors could be responsible. A clogged or dirty fuel filter is a common cause, so replace it. Similarly, a clogged air cleaner can lead to this issue; clean or replace it. A fuel leak due to a loose injection pipe retaining nut can also cause this, so tighten the nut. Other potential causes include a malfunctioning injection pump or governor, incorrect nozzle injection pressure, or a stuck/clogged injection nozzle, all of which may require repair or replacement.
R
Robert SmithAug 26, 2025
What to do if my Kubota Portable Generator engine overheated?
- V
  Vincent RogersAug 26, 2025
  If your Kubota Portable Generator is overheating, several issues could be the cause. Check if the engine oil or coolant levels are insufficient and fill them as needed. A broken or improperly tensioned fan belt can also lead to overheating, so replace or adjust it. The radiator net and fins might be clogged with dust, requiring cleaning. Corrosion inside the radiator or coolant flow route, a defective radiator cap, or a damaged radiator hose can also cause overheating, necessitating cleaning or replacement. Overload running should be avoided by reducing the load. Other potential causes include a defective head gasket, incorrect injection timing (adjust it), or using unsuitable fuel (use specified fuel).
R
raymichaelAug 27, 2025
Why does my Kubota Portable Generator emit white or blue exhaust gas?
- R
  romanjulianAug 28, 2025
  If your Kubota Portable Generator is producing white or blue exhaust gas, several factors could be the cause. Excessive engine oil is a common reason, so reduce it to the specified level. Worn or stuck piston rings and cylinders can also lead to this issue, requiring repair or replacement. Incorrect injection timing may be the culprit, so adjust it. Deficient compression can also contribute, so adjust the top clearance.
J
Jacob MeyerAug 30, 2025
What causes deficient output in a Kubota Portable Generator?
- A
  Ariel RasmussenAug 30, 2025
  If your Kubota Portable Generator has deficient output, several issues could be responsible. Incorrect injection timing is a possible cause, so adjust it. The engine’s moving parts might be seizing, necessitating repair or replacement. Uneven fuel injection can also lead to this problem, so replace the injection pump. Other potential causes include deficient nozzle injection (repair or replace the nozzle) and compression leaks (replace the head gasket and tighten the cylinder head screw, glow plug, and nozzle holder).
S
sjacobsonSep 4, 2025
What to do if the starter of my Kubota Portable Generator does not run?
- M
  Maria CardenasSep 4, 2025
  If the starter of your Kubota Portable Generator does not run, it could be due to a discharged battery, which needs to be charged. Alternatively, the starter itself might be malfunctioning, requiring repair or replacement. A disconnected wiring could also be the cause; ensure that it is properly connected.
J
Jason BensonSep 7, 2025
Why is fuel mixing into the lubricant oil in my Kubota Portable Generator?
- D
  David SmithSep 7, 2025
  If you notice fuel mixed into the lubricant oil of your Kubota Portable Generator, it could be due to a worn injection pump plunger, requiring replacement of the injection pump. Deficient nozzle injection can also cause this issue, so repair or replace the nozzle. In some cases, the injection pump might be broken and need replacement.
R
Randy WashingtonSep 9, 2025
What causes high oil pressure in a Kubota Portable Generator?
- I
  Isabella BurkeSep 9, 2025
  If you observe high oil pressure in your Kubota Portable Generator, it could be due to using a different type of oil than specified, so switch to the correct type. Alternatively, the relief valve might be defective and needs replacement.
J
John BrownSep 12, 2025
What causes excessive lubricant oil consumption in my Kubota Portable Generator?
- C
  Charles BrownSep 12, 2025
  If you notice excessive lubricant oil consumption in your Kubota Portable Generator, it could be due to several reasons. The piston ring gaps might be facing the same direction, so shift the ring gap direction. An oil ring could be worn or stuck, necessitating replacement. A worn piston ring groove might require replacing the piston. Worn valve stems and valve guides should be replaced. Oil leaks due to defective seals or packing should be addressed by replacing the faulty components.
D
Denise GloverSep 14, 2025
Why is water mixing into the lubricant oil in my Kubota Portable Generator?
- Z
  Zoe MartinezSep 14, 2025
  If water has mixed into the lubricant oil of your Kubota Portable Generator, it could be due to a defective head gasket, which needs replacement. Another possibility is a flawed cylinder block or cylinder head, also requiring replacement.

Summary

1. IDENTIFICATION

[1] MODEL NAME AND ENGINE SERIAL NUMBER

Identifies generator and engine model and serial numbers for service.

[2] E4 B ENGINE

Information on E4B engine designation for emission standards.

2. PRECAUTION

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

[1] WIRING

Precautions for safe and correct electrical wiring installation and handling.

[2] BATTERY

4. LUBRICANTS, FUEL AND COOLANT

6. MAINTENANCE CHECK LIST

7. CHECK AND MAINTENANCE

[1] DAILY CHECK

Routine checks performed daily to ensure proper operation and safety.

Maintenance Schedule

1. TROUBLESHOOTING

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

Procedures for inspecting and adjusting various engine and generator components.

[3] DISASSEMBLING AND ASSEMBLING

Step-by-step instructions for disassembling and reassembling major engine parts.

[4] SERVICING

Detailed servicing procedures for specific engine components and systems.

1. STRUCTURE

Automatic Voltage Regulator (A.V.R.) Assembly

Function and purpose of the AVR assembly in maintaining constant output voltage.

5. WIRING DIAGRAM

Summary

1. IDENTIFICATION

[1] MODEL NAME AND ENGINE SERIAL NUMBER

Identifies generator and engine model and serial numbers for service.

[2] E4 B ENGINE

Information on E4B engine designation for emission standards.

2. PRECAUTION

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

[1] WIRING

Precautions for safe and correct electrical wiring installation and handling.

[2] BATTERY

4. LUBRICANTS, FUEL AND COOLANT

6. MAINTENANCE CHECK LIST

7. CHECK AND MAINTENANCE

[1] DAILY CHECK

Routine checks performed daily to ensure proper operation and safety.

Maintenance Schedule

1. TROUBLESHOOTING

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

Procedures for inspecting and adjusting various engine and generator components.

[3] DISASSEMBLING AND ASSEMBLING

Step-by-step instructions for disassembling and reassembling major engine parts.

[4] SERVICING

Detailed servicing procedures for specific engine components and systems.

1. STRUCTURE

Automatic Voltage Regulator (A.V.R.) Assembly

Function and purpose of the AVR assembly in maintaining constant output voltage.

5. WIRING DIAGRAM

Kubota GL7000 Specifications

General

Model	GL7000
Category	Portable Generator
Rated Output	6.5 kVA
Standby Output	7.0 kVA
Rated Output (kW)	5.5 kW
Engine	Kubota D902
Fuel Type	Diesel
Starting System	Electric
Noise Level	72 dB(A)
Phase	Single Phase

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