Kubota SM-E3B Series User Manual (English)

Questions and Answers:

J
Jacob HaleAug 21, 2025
What to do if Kubota SM-E3B overheated?
- A
  ashlee74Aug 21, 2025
  If your Kubota Engine is overheating, several factors could be the cause. It might be due to insufficient engine oil (replenish), a broken or elongated fan belt (replace or adjust), or insufficient coolant (replenish). Other potential issues include a radiator net and radiator fin clogged with dust (clean), the inside of the radiator corroded (clean or replace), or a corroded coolant flow route (clean or replace). It may also be caused by a defective radiator cap (replace), overload running (reduce the load), a defective head gasket (replace), incorrect injection timing (adjust), or unsuitable fuel used (use specified fuel).
J
jonjonesAug 23, 2025
Why is black smoke coming from my Kubota SM-E3B?
- S
  Stephanie ClarkeAug 25, 2025
  If you notice black or dark gray exhaust gas from your Kubota Engine, it could be due to several reasons. The engine might be overloaded, in which case you should reduce the load. It could also be caused by using low-grade fuel, so ensure you use the specified fuel. Other potential causes include a clogged fuel filter (replace) or a clogged air cleaner (clean or replace). Finally, it could be due to deficient nozzle injection, requiring you to repair or replace the nozzle.
J
Joy WellsAug 26, 2025
What to do if Kubota SM-E3B has deficient output?
- S
  Shirley Jones MDAug 26, 2025
  If your Kubota Engine has deficient output, it could stem from several issues. Check for incorrect injection timing and adjust if necessary. The engine’s moving parts might be seizing, requiring repair or replacement. A malfunctioning injection pump or deficient nozzle injection could also be the cause, necessitating repair or replacement of the respective components. Finally, a compression leak could be the culprit; check the compression pressure and repair accordingly.
D
Denise Haynes DDSAug 28, 2025
What to do if the starter of Kubota SM-E3B does not run?
- C
  Christopher BatesAug 28, 2025
  If the starter on your Kubota Engine does not run, the possible causes are a discharged battery (charge), a malfunctioning starter (repair or replace), or disconnected wiring (connect).
B
Bethany CarterAug 30, 2025
How to fix Kubota SM-E3B Engine battery that quickly discharges?
- D
  Donna BarreraAug 30, 2025
  If your Kubota Engine's battery is quickly discharging, there are several possible reasons: insufficient battery electrolyte (replenish distilled water and charge), a slipping fan belt (adjust belt tension or replace), disconnected wiring (connect), a defective rectifier (replace), a defective alternator (replace), or a defective battery (replace).
A
Andrew LiSep 1, 2025
Why Kubota Engine revolution is not smooth?
- V
  Victoria PowellSep 2, 2025
  If your Kubota Engine revolution isn't smooth, consider these potential causes: a clogged or dirty fuel filter (replace), a clogged air cleaner (clean or replace), a fuel leak due to a loose injection pipe retaining nut (tighten retaining nut), a malfunctioning injection pump (repair or replace), incorrect nozzle injection pressure (adjust), a stuck or clogged injection nozzle (repair or replace), or a malfunctioning governor (repair).
K
Kim MerrittSep 4, 2025
Why is white or blue smoke coming from my Kubota SM-E3B?
- E
  Eric RobertsSep 4, 2025
  If you notice white or blue exhaust gas from your Kubota Engine, it could be due to excessive engine oil (reduce to specified level), worn or stuck piston ring and cylinder (repair or replace), or incorrect injection timing (adjust).
J
John ColeSep 6, 2025
Why does my Kubota Engine have low oil pressure?
- S
  Savannah OnealSep 6, 2025
  If your Kubota Engine has low oil pressure, it could be due to several reasons. The engine oil might be insufficient, requiring you to replenish it. Other potential issues include a clogged oil strainer (clean), a relief valve stuck with dirt (clean), or a relief valve spring weaken or broken (replace). It may also be caused by excessive oil clearance of crankshaft bearing, crankpin bearing, or rocker arm (replace). Other possible causes are clogged oil passage (clean), different type of oil (use specified type of oil), or defective oil pump (replace).
K
kevin06Sep 8, 2025
What causes excessive lubricant oil consumption in Kubota Engine?
- A
  Amy BrooksSep 8, 2025
  Excessive lubricant oil consumption in your Kubota Engine can be attributed to several factors. The piston ring’s gap might be facing the same direction (shift ring gap direction), the oil ring could be worn or stuck (replace), or the piston ring groove might be worn (replace piston). Additionally, worn valve stem and valve guide (replace), worn crankshaft bearing and crank pin bearing (replace), or oil leaking due to defective seals or packing (replace) can contribute to this issue.

Kubota SM-E3B Series Specifications

General

Brand	Kubota
Model	SM-E3B Series
Category	Engine
Language	English

Summary

To the Reader

General

Manual structure overview: engine ID, precautions, maintenance, and tools.

Mechanism

Manual structure overview: engine construction and function.

Servicing

Manual structure overview: troubleshooting, specifications, disassembly, and assembly.

Safety Instructions

Safety First

Explains safety alert symbols and warning levels (DANGER, WARNING, CAUTION, IMPORTANT, NOTE).

Before Servicing and Repairing

Lists initial safety steps before starting work on the engine.

Safety Instructions

Safety Starting

Precautions for safely starting the engine.

Safety Working

General safety guidelines for performing work on the engine.

Safety Instructions

Avoid Fires

Safety precautions related to fuel and ignition sources.

Ventilate Work Area

Importance of ventilation when running the engine.

Dispose of Fluids Properly

Guidelines for safe and environmentally sound fluid disposal.

Prevent Acid Burns

Safety precautions regarding battery acid exposure.

Safety Instructions

Prepare for Emergencies

Advice on having emergency supplies and contacts readily available.

Specifications

Z482-E3B Specifications

Technical specifications for the Z482-E3B engine model.

Z602-E3B Specifications

Technical specifications for the Z602-E3B engine model.

Specifications

D722-E3B Specifications

Technical specifications for the D722-E3B engine model.

D782-E3B Specifications

Technical specifications for the D782-E3B engine model.

D902-E3B Specifications

Technical specifications for the D902-E3B engine model.

Performance Curves

Z482-E3B Performance Curves

Performance curves and data for the Z482-E3B engine.

Performance Curves

Z602-E3B Performance Curves

Performance curves and data for the Z602-E3B engine.

Performance Curves

D722-E3B Performance Curves

Performance curves and data for the D722-E3B engine.

Performance Curves

D782-E3B Performance Curves

Performance curves and data for the D782-E3B engine.

Performance Curves

D902-E3B Performance Curves

Performance curves and data for the D902-E3B engine.

Dimensions

Z482-E3B Dimensions

Physical dimensions and diagrams for the Z482-E3B engine.

Dimensions

Z602-E3B Dimensions

Physical dimensions and diagrams for the Z602-E3B engine.

Dimensions

D722-E3B Dimensions

Physical dimensions and diagrams for the D722-E3B engine.

Dimensions

D782-E3B Dimensions

Physical dimensions and diagrams for the D782-E3B engine.

Dimensions

D902-E3B Dimensions

Physical dimensions and diagrams for the D902-E3B engine.

General

1. Engine Identification

Details on identifying engine model name and serial number.

General

2. E3B Engine

Information about E3B engine designation and emission standards.

3. Cylinder Number

How cylinder numbers are designated on Kubota diesel engines.

General

4. General Precautions

Guidelines for disassembly, tool usage, and reassembly safety.

General

5. Maintenance Check List

Table outlining maintenance intervals for various items.

General

5. Maintenance Check List (Continued)

Continues the table of maintenance intervals for engine components.

General

Engine Oil and Fuel Information

Details on API classification for engine oil and fuel types.

General

[1] Daily Check Points

Focuses on checking the engine oil level.

General

Checking and Replenish Coolant

Procedure for checking and topping up engine coolant.

General

[2] Check Points of Initial 50 Hours

Covers changing engine oil for the first time.

General

[3] Check Point of Every 50 Hours

Checking fuel hoses and bleeding the fuel system.

Replacing Oil Filter Cartridge

Procedure for replacing the oil filter cartridge.

General

[3] Check Point of Every 50 Hours (Continued)

Details on checking fuel hoses and bleeding the system.

General

[4] Check Point of Every 75 Hours

Procedure for changing engine oil for optional depth oil pans.

General

[5] Check Points of Every 100 Hours

Procedure for changing engine oil for standard depth oil pans.

General

Fan Belt Tension

Checking and adjusting fan belt tension.

Fan Belt Damage and Wear

Inspecting the fan belt for damage and wear.

Cleaning Air Cleaner Element

Procedure for cleaning the air cleaner element.

General

Cleaning Fuel Filter (Element Type only)

Procedure for cleaning the fuel filter element.

Checking Battery Electrolyte Level

Checking the battery electrolyte level.

General

[6] Check Point of Every 150 Hours

Replacing oil filter cartridge for optional oil pans.

[7] Check Points of Every 200 Hours

Replacing oil filter cartridge for standard oil pans.

General

Checking Radiator Hoses and Clamp Bands

Inspecting radiator hoses and clamp bands.

Checking Intake Air Line

Inspecting intake air and breather hoses.

[8] Check Points of Every 400 Hours

Procedure for replacing the fuel filter cartridge.

General

[9] Check Points of Every 500 Hours

Procedure for cleaning the water jacket and radiator interior.

General

Anti-Freeze

Information on anti-freeze types, mixing ratios, and usage.

Replacing Fan Belt

Procedure for replacing the fan belt.

General

[10] Check Points of Every 1 Or 2 Months

Procedures for recharging the battery.

General

Battery Specific Gravity

Procedure for checking battery specific gravity.

General

[11] Check Point of Every Year

Procedure for replacing the air cleaner element.

General

[12] Check Point of Every 800 Hours

Procedure for checking and adjusting valve clearance.

General

[13] Check Points of Every 1500 Hours

Checking nozzle spraying condition and fuel injection pressure.

General

Nozzle Holder

Procedures for handling the nozzle holder during service.

General

[14] Check Points of Every 3000 Hours

Procedure for checking and adjusting injection timing.

General

Injection Timing (Continued)

Notes on injection timing adjustments using shims.

General

Checking Injection Pump

Checking fuel tightness of pump element and delivery valve.

General

[15] Check Points of Every 2 Years

Procedures for replacing intake air line, battery, and radiator hoses.

General

Replacing Fuel Hoses and Clamp Bands

Procedure for replacing fuel hoses and bleeding the fuel system.

General

Cleaning Water Jacket and Radiator Interior

Procedure for cleaning the engine's water jacket and radiator.

General

Changing Radiator Coolant (L.L.C.) (Continued)

Information on anti-freeze types, mixing ratios, and usage.

General

5. Special Tools

Lists special tools required for engine testing and diagnostics.

General

5. Special Tools (Continued)

Details on injection pump pressure tester and valve guide tool.

General

5. Special Tools (Continued)

Details on bushing replacing tools and flywheel stopper.

General

5. Special Tools (Continued)

Details on crankshaft bearing replacing tools.

General

5. Special Tools (Continued)

Details on crank sleeve setter and sleeve guide.

Mechanism

1. Engine Body

Covers half-floating head cover and closed breather systems.

Mechanism

1. Engine Body (Continued)

Covers piston and oil pan descriptions.

Mechanism

2. Cooling System

Covers cooling fins around the gear case.

Servicing

1. Troubleshooting

Lists common engine problems and their probable causes and solutions.

Servicing

1. Troubleshooting (Continued)

Continues the list of common engine problems and solutions.

Servicing

1. Troubleshooting (Continued)

Continues the list of common engine problems and solutions.

Servicing

2. Servicing Specifications

Provides engine body specifications.

Servicing

2. Servicing Specifications (Continued)

Provides engine body specifications.

Servicing

2. Servicing Specifications (Continued)

Provides engine body specifications.

Servicing

2. Servicing Specifications (Continued)

Provides engine body specifications.

Servicing

2. Servicing Specifications (Continued)

Provides lubricating and cooling system specifications.

Servicing

2. Servicing Specifications (Continued)

Provides fuel system specifications.

Servicing

2. Servicing Specifications (Continued)

Provides electrical system specifications.

Servicing

3. Tightening Torques

General use screw, bolt, and nut tightening torques.

Servicing

3. Tightening Torques (Continued)

Details specific torques for engine components.

Servicing

4. Checking, Disassembling and Servicing

Focuses on engine body checks and adjustments.

Servicing

4. Checking, Disassembling and Servicing (Continued)

Focuses on checking and adjusting valve clearance.

Servicing

Lubricating System Checks

Procedures for checking engine oil pressure.

Cooling System Checks

Procedure for checking fan belt tension.

Servicing

Fan Belt Checks

Inspecting fan belt for damage and wear.

Radiator Cap and Water Leakage Tests

Testing radiator cap for air leaks and radiator for water leaks.

Servicing

4. Fuel System Checks

Procedure for checking and adjusting injection timing.

Servicing

Injection Timing (Continued)

Notes on injection timing adjustments using shims.

Servicing

Fuel Tightness of Pump Element

Checking fuel pump element tightness.

Fuel Tightness of Delivery Valve

Checking fuel delivery valve tightness.

Servicing

Nozzle Spraying Condition

Checking the nozzle spray pattern.

Fuel Injection Pressure

Measuring and adjusting fuel injection pressure.

Nozzle Valve Seat Tightness

Checking nozzle valve seat tightness.

Servicing

5. Electrical System

Checking battery voltage.

Servicing

Battery Specific Gravity Check

Procedure for checking battery specific gravity.

Servicing

7. Starter Checks

Performing motor test and magnetic switch test on the starter.

Servicing

Magnet Switch Continuity Test

Testing magnet switch continuity.

No-load Dynamo Output

Measuring dynamo output voltage at specified speed.

Servicing

Regulator Terminal Continuity

Testing regulator terminal continuity.

Regulating Voltage

Measuring the output voltage of the regulator.

Servicing

Alternator on Unit Test

Testing the alternator's performance on the unit.

Glow Plug Lead Terminal Voltage

Measuring voltage at the glow plug lead terminal.

Glow Plug Continuity

Checking glow plug continuity.

Engine Stop Solenoid Test (Energize to Stop Type)

Testing the stop solenoid for energize-to-stop function.

Servicing

Engine Stop Solenoid Test (Energize to Run Type)

Testing the stop solenoid for energize-to-run function.

Servicing

2. Disassembling and Assembling

Procedures for draining engine oil and coolant.

Servicing

(2) External Components

Procedures for removing alternator, starter, and related parts.

(3) Cylinder Head, Valves and Oil Pan

Procedures for removing cylinder head cover and injection pipes.

Servicing

Nozzle Holder Assembly and Glow Plug

Procedures for removing nozzle holder assembly and glow plugs.

Nozzle Heat Seal Service Removal Procedure

Procedure for removing the nozzle heat seal.

Servicing

Rocker Arm and Push Rod

Procedures for removing rocker arm assembly and push rods.

Servicing

Cylinder Head and Cylinder Head Gasket

Procedures for removing cylinder head and gasket.

Tappets

Procedures for removing tappets from the crankcase.

Servicing

Valves

Procedures for removing valves, springs, and seals.

Thermostat Assembly

Procedures for removing the thermostat assembly.

Water Pump Assembly (If necessary)

Procedures for removing the water pump assembly.

Servicing

Oil Pan and Oil Strainer

Procedures for removing the oil pan and oil strainer.

Servicing

(4) Gear Case and Timing Gears

Procedures for removing gear case and timing gears.

Servicing

Injection Pump, Fuel Feed Pump and Speed Control Plate (for Energize to Run Type Engine Stop Solenoid)

Procedures for removing injection pump, fuel feed pump, and speed control plate.

Servicing

Injection Pump, Fuel Feed Pump and Speed Control Plate (for Energize to Run Type Engine Stop Solenoid) (Continued)

Reassembly steps for injection pump, fuel feed pump, and speed control plate.

Servicing

Fan Drive Pulley

Procedures for removing and installing the fan drive pulley.

Servicing

Gear Case

Procedures for removing and reassembling the gear case.

Servicing

Idle Gear

Procedures for removing and installing the idle gear.

Camshaft

Procedures for removing and installing the camshaft.

Servicing

Fuel Camshaft

Procedures for removing and installing the fuel camshaft.

Oil Pump and Crankshaft Gear

Procedures for removing oil pump and crankshaft gear.

Servicing

(5) Piston and Connecting Rod

Procedures for handling connecting rod caps.

Servicing

Piston

Procedures for removing and installing pistons.

Servicing

Piston Ring and Connecting Rod

Procedures for handling piston rings and connecting rods.

Servicing

(6) Flywheel and Crankshaft

Procedures for removing the flywheel.

Bearing Case Cover

Procedures for removing the bearing case cover.

Servicing

Crankshaft Assembly

Procedures for removing the crankshaft.

Servicing

Main Bearing Case Assembly (Z482-E3B, D722-E3B, D782-E3B)

Procedures for assembling the main bearing case for specific models.

Servicing

Main Bearing Case Assembly (Z602-E3B, D902-E3B)

Procedures for assembling the main bearing case for specific models.

Servicing

(7) Starter

Procedures for disassembling the electromagnetic drive type starter.

Servicing

(7) Starter (Continued)

Procedures for disassembling the planetary gear reduction type starter.

Servicing

(8) Dynamo

Procedures for disassembling the dynamo.

Servicing

(9) Alternator

Procedures for disassembling the alternator.

Servicing

(1) Cylinder Head and Valves

Checking cylinder head top clearance.

Cylinder Head Surface Flatness

Checking cylinder head surface flatness.

Servicing

Cylinder Head Flaw

Checking the cylinder head for flaws using red penetrant.

Valve Recessing

Measuring valve recessing with a depth gauge.

Clearance between Valve Stem and Valve Guide

Measuring clearance between valve stem and guide.

Servicing

Replacing Valve Guide

Procedures for replacing the valve guide.

Valve Seating

Checking and correcting valve seating.

Servicing

Correcting Valve and Valve Seat

Procedures for correcting valve face and valve seat.

Valve Lapping

Procedures for valve lapping.

Servicing

Free Length and Tilt of Valve Spring

Measuring valve spring free length and tilt.

Valve Spring Setting Load

Measuring valve spring setting load.

Oil Clearance between Rocker Arm and Rocker Arm Shaft

Measuring oil clearance between rocker arm and shaft.

Servicing

Push Rod Alignment

Checking push rod alignment.

Oil Clearance between Tappet and Tappet Guide Bore

Measuring oil clearance between tappet and guide bore.

Servicing

Timing Gear Backlash

Checking timing gear backlash.

Idle Gear Side Clearance

Measuring idle gear side clearance.

Camshaft Side Clearance

Measuring camshaft side clearance.

Servicing

Camshaft Alignment

Checking camshaft alignment.

Cam Height

Measuring cam height.

Oil Clearance of Camshaft Journal

Measuring oil clearance of camshaft journal.

Servicing

Oil Clearance between Idle Gear Shaft and Idle Gear Bushing

Measuring oil clearance between idle gear shaft and bushing.

Replacing Idle Gear Bushing

Procedures for replacing the idle gear bushing.

Piston Pin Bore I.D.

Measuring the piston pin bore I.D.

Servicing

Oil Clearance between Piston Pin and Small End Bushing

Measuring oil clearance between piston pin and bushing.

Replacing Small End Bushing

Procedures for replacing the small end bushing.

Connecting Rod Alignment

Checking connecting rod alignment.

Servicing

Piston Ring Gap

Measuring piston ring gap.

Clearance between Piston Ring and Piston Ring Groove

Measuring clearance between piston ring and groove.

Servicing

Crankshaft Side Clearance

Checking crankshaft side clearance.

Crankshaft Alignment

Checking crankshaft alignment.

Servicing

Oil Clearance between Crankpin and Crankpin Bearing

Measuring oil clearance between crankpin and bearing.

Servicing

Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1

Measuring oil clearance between crankshaft journal and bearing 1.

Servicing

Undersize Crankshaft Bearing and Journal Dimensions

Information on undersize crankshaft bearing and journal dimensions.

Replacing Crankshaft Bearing 1

Procedures for replacing crankshaft bearing 1.

Servicing

Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3

Measuring oil clearance between crankshaft journal and bearings 2/3.

Servicing

Undersize Crankshaft Bearing and Journal Dimensions

Information on undersize crankshaft bearing and journal dimensions.

Servicing

(5) Cylinder

Checking cylinder wear and bore/hone procedures.

Correcting Cylinder (Oversize)

Procedures for correcting cylinder wear using oversize pistons.

Servicing

(6) Oil Pump

Measuring rotor lobe clearance.

Clearance between Outer Rotor and Pump Body

Measuring clearance between outer rotor and pump body.

Servicing

Clearance between Rotor and Cover

Measuring clearance between oil pump rotor and cover.

(7) Starter

Checking the overrunning clutch for wear or damage.

Servicing

(7) Starter (Continued)

Checking commutator wear and mica undercut.

Servicing

Brush Wear

Measuring brush length.

Brush Holder

Checking brush holder continuity.

Armature Coil

Checking armature coil continuity.

Servicing

(8) Alternator

Checking field coil continuity.

Bearing

Checking bearing for smooth rotation.

Stator

Measuring stator resistance and continuity.

Rotor

Measuring rotor resistance and continuity.

Servicing

(8) Alternator (Continued)

Checking slip ring, brush wear, rectifier, and IC regulator.

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Kubota SM-E3B Series User Manual

Table of Contents

Questions and Answers:

Kubota SM-E3B Series Specifications

Summary

To the Reader

General

Mechanism

Servicing

Safety Instructions

Safety First

Before Servicing and Repairing

Safety Instructions

Safety Starting

Safety Working

Safety Instructions

Avoid Fires

Ventilate Work Area

Dispose of Fluids Properly

Prevent Acid Burns

Safety Instructions

Prepare for Emergencies

Specifications

Z482-E3B Specifications

Z602-E3B Specifications

Specifications

D722-E3B Specifications

D782-E3B Specifications

D902-E3B Specifications

Performance Curves

Z482-E3B Performance Curves

Performance Curves

Z602-E3B Performance Curves

Performance Curves

D722-E3B Performance Curves

Performance Curves

D782-E3B Performance Curves

Performance Curves

D902-E3B Performance Curves

Dimensions

Z482-E3B Dimensions

Dimensions

Z602-E3B Dimensions

Dimensions

D722-E3B Dimensions

Dimensions

D782-E3B Dimensions

Dimensions

D902-E3B Dimensions

General

1. Engine Identification

General

2. E3B Engine

3. Cylinder Number

General

4. General Precautions

General

5. Maintenance Check List

General

5. Maintenance Check List (Continued)

General

Engine Oil and Fuel Information

General

[1] Daily Check Points

General

Checking and Replenish Coolant

General

[2] Check Points of Initial 50 Hours

General

[3] Check Point of Every 50 Hours

Replacing Oil Filter Cartridge

General

[3] Check Point of Every 50 Hours (Continued)

General

[4] Check Point of Every 75 Hours

General

[5] Check Points of Every 100 Hours

General

Fan Belt Tension

Fan Belt Damage and Wear