Kubota WG2503-G-E3 User Manual

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WG1605

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WG2503

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WG3800

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PRINTED IN JAPAN

©

KUBOTA Corporation 2011

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2500

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OPERATOR'S MANUAL

KUBOTA LIQUID COOLED GASOLINE

/

LPG ENGINE

MANUEL DE L'OPERATEUR

MOTEUR À ESSENCE

/

LPG REFROIDI PAR LIQUIDE DE KUBOTA

BEDIENUNGSANLEITUNG

FLÜSSIGKEITSGEKÜHLTER BENZIN-

/

LPG-MOTOR VON KUBOTA

MANUALE DELL'OPERATORE

MOTORE KUBOTA A BENZINA

/

LPG CON RAFFREDDAMENTO A LIQUID

O

MANUAL DE INSTRUCCIONES

MOTOR KUBOTA DE GASOLINA

/

LPG REFRIGERADO POR LÍQUIDO

Code No. EG523-8917-5

WG1605-G-E3

WG1605-L-E 3

WG1605-GL-E3

WG1605-N-E3

WG1605-LN-E3

WG1903-G-E3

WG1903-L-E 3

WG1903-GL-E3

WG1903-N-E3

WG1903-LN-E3

WG2503-G-E3

WG2503-L-E 3

WG2503-GL-E3

WG2503-N-E3

WG2503-LN-E3

WG3800-G-E3

WG3800-L-E 3

WG3800-GL-E3

WG3800-N-E3

WG3800-LN-E3

WG3800-L-E5

WG3800-N-E5

1BGAAAIAP0020 1BGAAAIAP0540 1BGAAAIAP0220 1BGAAAIAP0440

1910-0614

READ AND SAVE THIS BOOK

MANUEL A LIRE ET A CONSERVER

DIESE ANLEITUNG BITTE SORGFÄLTIG DURCHLESEN

UND GRIFFBEREIT AUFBEWAHREN

LEGGETE E CONSERVATE QUESTO MANUALE

LEAN Y CONSERVEN ESTE MANUAL

Table of Contents

Questions and Answers:

J
Jasmin PerezAug 18, 2025
Why is it difficult to start my Kubota WG2503-G-E3?
- L
  Laurie FoxAug 18, 2025
  Several factors can make it hard to start your Kubota Engine. It could be due to fuel not flowing, which means you should check the fuel tank, fuel filter, fuel hoses, and fuel pump. Clean the filter if it contains water or foreign matter. Other possible causes include incorrect valve clearance (adjust when the engine is cold), thick engine oil in cold weather (change the oil grade), a discharged battery (charge it, and in winter, remove, charge, and store indoors), a clogged air cleaner (clean or replace it), wet spark plug electrodes (dry them), a defective starter or main switch (repair or replace), a defective vaporizer or lock off valve (replace), low compression (replace worn parts like valves, rings, pistons, or liners), or a disconnection in the wire harness (check the harness).
J
Jessica SmithAug 21, 2025
What to do if Kubota WG2503-G-E3 suddenly stops?
- N
  Nicole HarrellAug 22, 2025
  If your Kubota Engine suddenly stops, there are several things to investigate. First, check the fuel tank to ensure you have enough fuel and inspect the fuel system for any air or leaks. Next, check the engine oil level using the oil level gauge and examine the lubricating oil system, replacing the oil filter cartridge if needed. A clogged air cleaner can also cause the engine to stop, so clean or replace it. Finally, check the wire harness for any disconnections.
D
deborahmorganAug 25, 2025
Why Kubota WG2503-G-E3 output is insufficient?
- L
  Linda HodgeAug 25, 2025
  Insufficient output in your Kubota Engine can stem from several issues. Check the fuel system for any problems that might be causing insufficient fuel supply. Inspect the lubricating oil system for overheating of moving parts, ensuring the lubricating oil filter is working correctly and that bearing clearances are within factory specifications; replace the filter element if it's clogged. Other potential causes include insufficient compression (replace worn parts like valves, rings, pistons, and liners), incorrect valve clearance (adjust when the engine is cold), a dirty air cleaner (clean or replace it), or a defective spark plug or ignition coil (clean/replace the spark plug and replace the ignition coil).
A
Andrew ChoiAug 27, 2025
Why is my Kubota WG2503-G-E3 speed insufficient?
- L
  lsmithAug 27, 2025
  If your Kubota Engine speed is insufficient, start by inspecting the spark plug for defects and clean or replace it as needed. Other potential causes include a defective ignition coil or throttle body (replace them), a separated breather tube (attach it correctly), or an improper input signal to the ECU or disconnection (check the wire harness).
B
bestradaAug 30, 2025
What to do if my Kubota Engine output is insufficient?
- M
  mcbridechristinaAug 31, 2025
  If your Kubota Engine's output is insufficient, several issues could be the cause. Insufficient compression may be the problem, which can be resolved by replacing bad valves or worn rings, pistons, and liners. Also, check the fuel system for insufficient fuel. Overheating moving parts can also cause this problem, so inspect the lubricating oil system, ensure the lubricating oil filter is working correctly (replace if the filter element is deposited with impurities), and verify the bearing clearance is within factory specifications. Other potential causes are incorrect valve clearance (adjust when the engine is cold), a dirty air cleaner (clean or replace), a defective spark plug (clean or replace), or a defective ignition coil (replace).
Z
zfigueroaSep 2, 2025
What causes a Kubota WG2503-G-E3 Engine to overheat?
- W
  wthomasSep 3, 2025
  Several factors can cause a Kubota Engine to overheat. Check the engine oil level and replenish if insufficient. Inspect the fan belt for breakage or elongation, and change or adjust it as needed. Ensure the coolant level is sufficient and adjust the antifreeze concentration if it's excessive by adding water or changing to the specified mixing ratio. Clean any dust clogging the radiator net or fins. Also, check for corrosion inside the radiator or coolant flow route, cleaning or replacing parts as necessary. Other potential causes include defective components like the fan, radiator, radiator cap, thermostat, or temperature sensor (replace as needed), running with an overload (reduce the load), or a defective head gasket with water leakage (replace parts).
B
Brian VillarrealSep 5, 2025
What causes excessive black exhaust gas in a Kubota WG2503-G-E3 Engine?
- D
  Derek JohnsonSep 5, 2025
  Excessive black exhaust gas in a Kubota Engine can be attributed to a bad fuel system or fuel of extremely poor quality. Check the fuel system and replace the fuel if it is poor quality.
B
Brian HallSep 8, 2025
What causes excessive lubricant oil consumption in Kubota WG2503-G-E3 Engine?
- C
  charles81Sep 8, 2025
  Excessive lubricant oil consumption in a Kubota Engine can be due to several reasons. Oil may be leaking from the oil seal, gasket, or other areas, in which case you should replace the leaking components. Other potential causes include a defective valve stem seal or worn/stuck piston rings and liners (replace).

Kubota WG2503-G-E3 Specifications

General

Engine Model	WG2503-G-E3
Number of Cylinders	3
Fuel System	Direct Injection
Fuel Type	Diesel
Aspiration	Natural
Starting System	Electric Starter
Cooling System	Water-Cooled
Lubrication System	Forced Lubrication
Rotation	Counterclockwise (flywheel side)

Summary

Safe Operation

Observe Safety Instructions

Read and understand manual and labels before operating the engine.

Wear Safe Clothing and Personal Protective Equipment (PPE)

Check Before Starting & Operating the Engine

Pre-operation inspection checklist to ensure safe operation.

Safe Handling of Fuel and Lubricants

Precautions for handling flammable materials safely.

Exhaust Gases & Fire Prevention

Cautions Against Burns & Battery Explosion

Conducting Safety Checks & Maintenance

Important Information of Emission Regulation

Names of Parts

Pre-Operation Check

Daily Check

Routine checks to perform before starting the engine.

Operating the Engine

Starting the Engine (Normal)

Step-by-step guide for starting the engine.

Stopping the Engine

Procedures for safely shutting down the engine.

Checks During Operation

Periodic Service

Fuel

Engine Oil

Procedures for checking, adding, and changing engine oil.

Radiator

Air Cleaner

Fuel System and Diagrams

Troubleshooting

When it is Difficult to Start the Engine

Common causes and remedies for starting issues.

When Output is Insufficient

Common causes and remedies for low engine output.

When Engine Speed is Insufficient

Causes and remedies for insufficient engine speed.

When Engine Suddenly Stops

Common causes and remedies for sudden engine shutdown.

When Excessive Black Exhaust Gas is Observed

When White Exhaust Gas is Observed

When Lubricant Oil Consumption is Excessive

When Engine Overheats

Causes and remedies for engine overheating.

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