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Onan MDKBH Series

Onan MDKBH Series
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Table of Contents

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Onan MDKBH Series Specifications

General IconGeneral
ModelMDKBH Series
CategoryPortable Generator
Fuel TypeDiesel
Frequency60 Hz
Voltage120/240V
PhaseSingle
Starting SystemElectric

Summary

Safety Precautions

General Precautions

Covers general operating safety rules and precautions for genset operation.

Generator Voltage is Deadly

Critical warning about lethal electrical hazards associated with generator voltage.

Engine Exhaust is Deadly

Critical warning about toxic exhaust gases and carbon monoxide poisoning.

Diesel Fuel is Combustible

Safety procedures for handling combustible diesel fuel and sources of ignition.

Gasoline is Flammable and Explosive

Safety procedures for handling flammable and explosive gasoline.

Battery Gas is Explosive

Safety procedures related to explosive battery gases and handling batteries.

Moving Parts Can Cause Severe Personal Injury or Death

Safety precautions regarding mechanical hazards from moving engine parts.

Flammable Vapor Can Cause a Diesel Engine to Overspeed

Warning about engine overspeed and potential hazards from flammable vapors.

1. Introduction

About This Manual

Explains the purpose, scope, and intended audience of the service manual.

Model Identification

Details on how to identify the genset model and serial number for service.

Emissions Label

Information regarding engine emissions compliance labels and regulations.

2. Control Panels

Local Control Panel

Description of the physical control panel and its components.

Remote Control Panels

Information on optional remote control stations and boat monitoring systems.

Digital Display

Details on the e-Series Digital Display interface, buttons, and status lamps.

Genset Status Screens

How to view and interpret genset operating status displays on the digital screen.

Fault Screens

Explanation of how fault conditions are displayed on the digital screen.

Engine Pre-Alarm Screens

Indicators for conditions approaching shutdown, like low oil pressure.

Configuring Genset Controller

Procedures for setting up or replacing the genset controller via display or switch.

3. Operation

Fuel

Requirements and safety precautions for diesel fuel usage.

Engine Oil

Recommendations for engine oil type, viscosity, and capacity.

Engine Coolant

Coolant requirements, mixture, safety, and capacity details.

Batteries

Importance of battery system capacity and maintenance for genset operation.

Fire Extinguisher Port

Description and use of the fire extinguisher access port on the genset enclosure.

Starting the Genset

Step-by-step procedure for starting the genset from control panels.

Stopping the Genset

Procedure for safely stopping the genset and allowing it to cool down.

Emergency Stop

How to use the emergency stop switch for immediate shutdown.

Loading the Genset

Guidelines for applying electrical load to the genset and managing overload.

Connecting to Shore Power

Safety and procedure for connecting the genset to shore power.

Storing the Genset

Procedures for proper long-term storage of the genset to preserve performance.

Returning the Genset to Service

Steps to follow when putting a stored genset back into operation.

4. Periodic Maintenance

Periodic Maintenance Schedule

Guide for scheduled maintenance tasks and their recommended intervals.

General Inspection

Routine visual and operational checks performed before starting or after operation.

Checking Engine Oil Level

Procedure for checking the engine oil level using the dipstick.

Changing Engine Oil and Filter

Step-by-step instructions for replacing the engine oil and oil filter.

DrainingReplacing the Fuel Filter

Procedure for draining water from and replacing the fuel filter.

Maintaining the Engine Cooling System

General maintenance procedures for the engine's liquid cooling system.

Draining and Cleaning Cooling System

Specific procedure for draining and cleaning the engine cooling system.

Refilling Cooling System

Steps for refilling the engine cooling system after maintenance.

Heat Exchanger

Maintenance procedures for cleaning and servicing the heat exchanger.

Replacing the Thermostat

Instructions for replacing the engine thermostat.

Siphon Break

Information on maintaining the siphon break device to prevent engine flooding.

Adjusting V-Belt Tension

How to properly adjust the tension of the generator drive belt.

Replacing the Raw Water Pump Impeller

Procedure for replacing the raw water pump impeller.

5. Enclosure, Drip Pan and Mounting System

Enclosure Panels

Details on genset enclosure panels, access doors, and their removal.

Drip Pan and Mounting System

Information on the genset's drip pan and mounting system components.

6. Engine and Accessories

Major Engine Service

Overview of significant engine servicing tasks and references.

Adjusting Valve Lash

Procedure for adjusting engine valve lash for proper operation.

Intake Resonator Assembly

Maintenance and assembly of the air intake resonator system.

Exhaust Manifold

Maintenance of the exhaust manifold and related components.

Fuel System

Detailed procedures for fuel system maintenance, testing, and components.

Glow Plugs

Servicing, testing, and replacement of engine glow plugs.

Governor Actuator

Information on the governor actuator, its checks, tests, and servicing.

Starter

Procedures for starter motor removal, replacement, and connections.

7. Generator Drive

Overview

Description of the belt-driven generator drive system and its components.

Inspecting Drive and Bearings

Procedures for inspecting generator drive components and bearings.

8. Generator

Overview

General description of the generator's construction, operation, and components.

Stator

Description of the generator stator component and its windings.

Rotor

Description of the generator rotor component and its windings.

Servicing the Generator

Procedures for general servicing, removal, and reassembly of the generator.

Servicing Brushes and Slip Rings

Maintenance procedures for the generator's brushes and slip rings.

Testing Generator Windings

Methods for testing generator rotor and stator windings for opens and shorts.

9. Genset Control

Overview

Introduction to the genset control system, controller mounting, and displays.

Genset Controller

Description of the genset's main microprocessor-based control unit.

Configuring a Replacement Controller

Steps to configure or reconfigure the genset controller for model and generator.

Major Functions of Genset Controller

Explanation of the controller's primary operational functions like initialization and startup.

Emergency Stop Switch (CB1)

Function, testing, and replacement of the emergency stop switch.

Battery Charging Regulator (A1)

Description and testing procedures for the battery charging regulator.

Governor Actuator (A12)

Details on the governor actuator, its function, and related components.

10. Reconfiguring Voltage and Frequency

As Manufactured Block on Nameplate

Information on factory settings for frequency and voltage shown on the nameplate.

Changing Frequency

Procedure to change the genset's operating frequency using jumpers.

Reconnecting Generator

Steps for reconfiguring the generator for different application voltages.

Adjusting Voltage Using Control Switch

Method to adjust output voltage using the control switch.

Adjusting Voltage Using Optional Digital Display

Method to adjust output voltage using the optional digital display.

11. Troubleshooting

Troubleshooting with Digital Display

How to interpret fault codes and descriptions shown on the digital display.

Troubleshooting with Status Lamp

How to interpret fault codes indicated by status lamps on the control switch.

12. Specifications

Generator

Technical specifications for the generator, including bearings and regulation.

Fuel Consumption

Data on fuel consumption at various loads and frequencies.

Engine

Technical specifications for the 4-stroke indirect injection diesel engine.

Wiring Diagram

Generator Connection Diagram

Control Wiring Harness

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