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Kubota Z602-E4 - User Manual

Kubota Z602-E4
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PRINTED IN JAPAN
©
KUBOTA Corporation 2012
U.S.A. :KUBOTAENGINEAMERICACORPORATION
505
SchelterRoad,Lincolnshire,Illinois
60069
U.S.A.
Telephone:(
847
)
955
-
2500
Canada :KUBOTACANADALTD.
5900
14
thAvenue,Markham,Ontario,L
3
S
4
K
4
,Canada
Telephone:(
905
)
294
-
7477
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49
)
6106
-
873
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9
3
UN,U.K.
Telephone:(
44
)
1844
-
214500
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Telephone:(
61
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3
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9394
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81
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6
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81
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6
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6648
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3521
1906-0631
OPERATOR
'
S MANUAL
KUBOTA DIESEL ENGINE
MANUEL DE L
'
OPERATEUR
MOTEUR DIESEL DE KUBOTA
BEDIENUNGSANLEITUNG
KUBOTA DIESEL MOTOR
MANUALE DELL
'
OPERATORE
KUBOTA MOTORE DIESEL
MANUAL DE INSTRUCCIONES
KUBOTA DIESEL MOTOR
Code No. 1J090-8916-7
1ABAAAAAP1560
Z482-E4
·
Z602-E4
D722-E4
·
D782-E4
D902-E4
·
D902-T-E4
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
Z482
-
E4
·Z602
-
E4
·D722
-
E4
·D782
-
E4
·D902
-
E4·D902
--
T
-
E4

Table of Contents

Questions and Answers

  • E
    Emily WhiteAug 8, 2025
    How to troubleshoot a Kubota Z602-E4 that is difficult to start?
    • A
      Andrew WestAug 8, 2025
      If you are experiencing difficulty starting your Kubota Engine, several factors could be the cause. The fuel may be thick and not flowing properly; in this case, check the fuel tank and fuel filter, removing any water, dirt, or impurities, and clean the filter with kerosene if needed. Air or water mixed in the fuel system can also prevent proper fuel pump operation; check for loosened fuel line couplings or cap nuts, and loosen air vent screws to eliminate air in the fuel system. In cold weather, engine oil can become thick, causing slow cranking; change the grade of oil according to the temperature. Lastly, a discharged battery can prevent the engine from cranking; charge the battery, and in winter, remove the battery, charge it fully, keep it indoors, and install it at the time of use.
  • K
    Karen SaundersAug 14, 2025
    Why does my Kubota Engine have insufficient output?
    • M
      Mark CarpenterAug 14, 2025
      If your Kubota Engine has insufficient output, it may be due to a lack of fuel; check the fuel tank and refill if necessary, also check the fuel system for air or leaks. A bad nozzle can also cause this issue; if necessary, replace it with a new one. Additionally, moving parts may be overheated due to a shortage of lubrication oil or improper lubrication; check the engine oil level with the oil level gauge and inspect the lubricating oil system, replacing the oil filter cartridge every two oil changes.
  • D
    Danny SmithAug 27, 2025
    Why does my Kubota Z602-E4 have bad exhaust color?
    • M
      Michele WilliamsAug 27, 2025
      If the exhaust color from your Kubota Engine is bad, it might be due to extremely poor quality fuel. Select good quality fuel and use No. 2-D diesel fuel only. Another cause could be a bad nozzle, which may need replacement.
  • T
    Tanya GriffithSep 1, 2025
    What to do if Kubota Z602-E4 stops suddenly?
    • J
      Joel SchmidtSep 1, 2025
      If your Kubota Engine suddenly stops, check the fuel injection system, especially the fuel injection nozzle. Also, check the lubricating system, the function of the relieve valve, the pressure switch and the filter base gasket.
  • L
    latoya37Nov 19, 2025
    Why is my Kubota Z602-E4 overheating?
    • J
      Joseph PierceNov 19, 2025
      If your Kubota Engine is overheating, several factors could be the cause. It might be due to insufficient engine oil (check and replenish), a broken or elongated fan belt (change or adjust), insufficient coolant (replenish coolant), or an excessive concentration of antifreeze (add water or change to specified mixing ratio). Other potential causes include a radiator net or fin clogged with dust (clean carefully), corrosion inside the radiator or coolant flow route (clean or replace parts), defective fan, radiator, or radiator cap (replace), a defective thermostat (check and replace), or a defective temperature gauge or sensor (check with thermometer and replace). Overload running (reduce load), a defective head gasket or water leakage (replace parts), or unsuitable fuel (use specified fuel)...

Summary

Foreword

Safety First

General safety precautions and warnings including DANGER, WARNING, and CAUTION symbols.

Safe Operation Practices

Observe Safety Instructions

Wear Safe Clothing and PPE

Pre-Start Checks and Surroundings

Inspect engine, ensure guards are in place, and maintain safe distance.

Handling Fuel, Lubricants, and Fluids

Operational Hazards and Precautions

Precautions against exhaust gases, escaping fluids, burns, battery explosion, and rotating parts.

Pre-Operation Check

Daily Check

Routine pre-operation checks to ensure engine condition and safety.

Operating the Engine

Starting the Engine (Normal)

Step-by-step procedure for starting the engine under standard conditions.

Cold Weather Starting

Stopping the Engine

Maintenance

Service Intervals Overview

Periodic Service - Fuel

Fuel Level Check and Refueling

Air Bleeding the Fuel System

Periodic Service - Engine Oil

Checking and Adding Engine Oil

How to check and add engine oil to maintain the correct level.

Periodic Service - Radiator

Replacing the Oil Filter Cartridge

Checking Coolant Level, Adding Coolant

Periodic Service - Air Cleaner

Air Cleaner Maintenance

Troubleshooting

Difficult Engine Starting

Identifies causes and countermeasures for engines that are hard to start.

Engine Stoppage Issues

Addresses problems leading to sudden engine stoppage and their solutions.

Insufficient Engine Output

Troubleshooting - Overheating

Engine Overheating Causes

Lists common reasons for engine overheating and corrective actions.

Wiring Diagrams

Electrical System Diagrams

Kubota Z602-E4 Specifications

General IconGeneral
Engine ModelZ602-E4
Engine TypeVertical, water-cooled, 4-cycle diesel
Number of Cylinders2
Combustion systemDirect injection
Cooling SystemWater-cooled
Starting SystemElectric starter
FuelDiesel
Lubrication SystemForced lubrication
TypeDiesel Engine

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