Kubota WG3800-L-E5 - User Manual

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WG1605

E3/L

E3/GL

E3/N

E3/LN

WG1903

E3/L

E3/GL

E3/N

E3/LN

WG2503

E3/L

E3/GL

E3/N

E3/LN

WG3800

E3/L

E3/GL

E3/N

E3/LN

E3/L

E5/N

PRINTED IN JAPAN

KUBOTA Corporation 2011

U.S.A. :KUBOTAENGINEAMERICACORPORATION

505

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60069

U.S.A.

Telephone:(

847

)

955

2500

Canada :KUBOTACANADALTD.

5900

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thAvenue,Markham,Ontario,L

S

,Canada

Telephone:(

905

)

294

7477

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UN,U.K.

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)

1844

214500

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,Australia

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9394

4400

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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

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

Main Page

Questions and Answers

J
Jordan CollinsAug 6, 2025
Why is it difficult to start my Kubota WG3800-L-E5?
- L
  Lawrence HamptonAug 6, 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).
R
Richard ClarkAug 20, 2025
What to do if my Kubota Engine output is insufficient?
- K
  Katherine GilmoreAug 20, 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).

Summary

FOREWORD

SAFETY FIRST

Explains safety symbols and warnings used in the manual.

SAFE OPERATION

OBSERVE SAFETY INSTRUCTIONS

Read and understand manual, learn safe operation, and explain to others.

WEAR SAFE CLOTHING AND PERSONAL PROTECTIVE EQUIPMENT (PPE)

Wear appropriate clothing and PPE to prevent injury.

SAFE OPERATION

CHECK BEFORE STARTING & OPERATING THE ENGINE

Inspect engine, guards, and ensure safe distance before operation.

KEEP THE ENGINE AND SURROUNDINGS CLEAN

Keep engine and area clean to prevent fire and ensure safety.

SAFE HANDLING OF FUEL AND LUBRICANTS -KEEP AWAY FROM FIRE

Handle fuel and lubricants safely, away from ignition sources.

SAFE OPERATION

EXHAUST GASES & FIRE PREVENTION

Run engine in well-ventilated areas, keep engine clean, check for leaks.

ESCAPING FLUID

Relieve pressure before disconnecting, beware of high-pressure fluid.

SAFE OPERATION

CAUTIONS AGAINST BURNS & BATTERY EXPLOSION

Be cautious of hot parts and battery hazards.

KEEP HANDS AND BODY AWAY FROM ROTATING PARTS

Stay clear of moving parts like fans and belts during operation.

SAFE OPERATION

ANTI-FREEZE & DISPOSAL OF FLUIDS

Handle anti-freeze and dispose of fluids safely and environmentally.

CONDUCTING SAFETY CHECKS & MAINTENANCE

Perform maintenance on a level surface, disconnect battery, use proper tools.

SAFE OPERATION

WARNING AND CAUTION LABELS

Identifies and explains various warning and caution labels on the engine.

CARE OF WARNING AND CAUTION LABELS

Instructions for cleaning, maintaining, and replacing warning labels.

SERVICING OF THE ENGINE

General advice on engine servicing and identifying serial number.

IMPORTANT INFORMATION OF EMISSION REGULATION

EXHAUST SYSTEM (COMMON)

Specifies catalytic parts required for emission compliance.

LPG REGULATOR WITH VAPORIZER

Requirements for LPG regulator and lock-off valve for emission compliance.

NAMES OF PARTS

[WG1605-G-E3; WG1605-L-E3; WG1605-GL-E3; WG1605-N-E3; WG1605-LN-E3]

Identifies parts for specific WG1605 models.

NAMES OF PARTS

[WG1903-G-E3; WG1903-L-E3; WG1903-GL-E3; WG1903-N-E3; WG1903-LN-E3]

Identifies parts for specific WG1903 models.

NAMES OF PARTS

[WG2503-G-E3; WG2503-L-E3; WG2503-GL-E3; WG2503-N-E3; WG2503-LN-E3]

Identifies parts for specific WG2503 models.

NAMES OF PARTS

[WG3800-G-E3; WG3800-L-E3; WG3800-GL-E3; WG3800-N-E3; WG3800-LN-E3]

Identifies parts for specific WG3800 models.

PRE-OPERATION CHECK

BREAK-IN

Initial break-in procedures for the engine.

DAILY CHECK

Daily pre-operation checks to ensure engine condition.

OPERATING THE ENGINE

STARTING THE ENGINE (NORMAL)

Instructions for starting the engine safely under normal conditions.

OPERATING THE ENGINE

Gasoline

Steps for starting the engine using gasoline fuel.

LPG

Steps for starting the engine using LPG fuel.

Natural Gas

Steps for starting the engine using Natural Gas.

OPERATING THE ENGINE

STOPPING THE ENGINE

Procedures for safely stopping the engine for Gasoline, LPG, and NG.

OPERATING THE ENGINE

CHECKS DURING OPERATION

Checks to perform while the engine is running (coolant, oil pressure).

EMISSION CONTROL SYSTEM

Proper operation and maintenance of the emission control system.

MAINTENANCE

General safety precautions for performing maintenance tasks.

MAINTENANCE

SERVICE INTERVALS

Schedule for periodic maintenance checks and replacements.

MAINTENANCE

SERVICE INTERVALS

Extended schedule for periodic maintenance checks and replacements.

MAINTENANCE

SERVICE INTERVALS

Further extended schedule for periodic maintenance checks and replacements.

MAINTENANCE

SERVICE INTERVALS

Final part of the periodic maintenance schedule.

MAINTENANCE

AIR CLEANER

Maintenance and cleaning of the air cleaner element.

PERIODIC SERVICE

FUEL SYSTEM AND DIAGRAMS

Information on LPG and NG fuel systems and diagrams.

PERIODIC SERVICE

FUEL SYSTEM DIAGRAMS

Diagrams illustrating LPG and Gasoline fuel systems.

PERIODIC SERVICE

FUEL SYSTEM DIAGRAMS

Diagrams illustrating Natural Gas fuel systems.

PERIODIC SERVICE

Checking oil level and adding engine oil

Procedure for checking and adding engine oil to maintain proper level.

PERIODIC SERVICE

Changing engine oil

Steps for draining and replacing engine oil.

PERIODIC SERVICE

Replacing the oil filter cartridge

How to replace the engine oil filter cartridge.

PERIODIC SERVICE

SPARK PLUG

Cleaning, adjustment, and tightening of the spark plug.

PERIODIC SERVICE

RADIATOR

Checking coolant level and adding coolant to the radiator.

PERIODIC SERVICE

Changing coolant

Procedure for draining and changing the engine coolant.

PERIODIC SERVICE

Checking radiator hoses and clamp bands

How to check radiator hoses and clamp bands for damage or leaks.

Precaution at overheating

Actions to take if the engine overheats.

Cleaning radiator core (outside)

Instructions for cleaning the radiator fins.

PERIODIC SERVICE

Anti-freeze

Safety precautions and guidelines for using anti-freeze.

PERIODIC SERVICE

AIR CLEANER

Maintenance and cleaning procedures for the air cleaner.

PERIODIC SERVICE

FUEL SYSTEM AND DIAGRAMS

Details on LPG and NG fuel systems, including tightening torques.

PERIODIC SERVICE

FUEL SYSTEM DIAGRAMS

Diagrams illustrating LPG and Gasoline fuel systems.

PERIODIC SERVICE

FUEL SYSTEM DIAGRAMS

Diagrams illustrating Natural Gas fuel systems.

PERIODIC SERVICE

ELECTRIC WIRING

Precautions and checks for electric wiring.

FAN BELT

How to adjust fan belt tension and check for damage.

PERIODIC SERVICE

OIL SEPARATOR

Changing the oil separator element.

RUBBER PIPING RELATED OIL SEPARATOR

Service for rubber piping related oil separators.

CARRIAGE AND STORAGE

CARRIAGE

Safety precautions for moving and lifting the engine.

STORAGE

Procedures for storing the engine for extended periods.

TROUBLESHOOTING

When it is difficult to start the engine

Common causes and remedies for engine starting issues.

When output is insufficient

Causes and remedies for insufficient engine power or output.

TROUBLESHOOTING

When engine speed is insufficient

Causes and remedies for low engine speed.

When engine suddenly stops

Causes and remedies for the engine stopping unexpectedly.

TROUBLESHOOTING

When engine overheats

Causes and remedies when the engine overheats.

SPECIFICATIONS

WG1605 Series Specifications

Technical specs for WG1605-G, -L, -GL, -N, -LN models.

WG1903 Series Specifications

Technical specs for WG1903-G, -L, -GL, -N, -LN models.

WG2503 Series Specifications

Technical specs for WG2503-G, -L, -GL, -N, -LN models.

WG3800 Series Specifications

Technical specs for WG3800-GL, -G, -L, -N, -LN, -L-E5, -N-E5 models.

Kubota WG3800-L-E5 Specifications

General

Engine Model	WG3800-L-E5
Cylinder Arrangement	Inline
Number of Cylinders	4
Rated Speed	2200 rpm
Combustion System	Spark ignition
Fuel Type	Gasoline
Displacement	3.769 L
Fuel System	Electronic Fuel Injection
Lubrication System	Forced lubrication
Starting System	Electric starter
Cooling System	Water-cooled