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Kohler COMMAND CH740 Service Manual

Kohler COMMAND CH740
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SERVICE MANUAL
HORIZONTAL CRANKSHAFT
COMMAND CH18-750

Questions and Answers:

Kohler COMMAND CH740 Specifications

General IconGeneral
Compression Ratio8.5:1
Cooling SystemAir-cooled
Ignition SystemElectronic
Fuel SystemCarburetor
StarterElectric
Engine Type4-cycle, OHV, V-twin
Displacement725 cc
LubricationFull Pressure
Max Power25 hp (18.6 kW)
Weight44 kg (97 lbs)
Power25 hp (18.6 kW)

Summary

Section 1 Safety and General Information

Safety Precautions

General safety guidelines for engine operation and maintenance.

For Your Safety!

Specific warnings for hazardous conditions like rotating parts and hot surfaces.

WARNING: Explosive Fuel!

Hazards associated with gasoline, storage, and handling to prevent fire or explosion.

Section 3 Troubleshooting

Engine Cranks But Will Not Start

Diagnostic steps for when the engine turns over but fails to ignite.

Engine Starts Hard

Causes and solutions for engines that are difficult to start.

Engine Overheats

Diagnosing and resolving engine overheating issues.

Engine Loses Power

Troubleshooting steps for engines experiencing a loss of power.

Engine Uses Excessive Amount of Oil

Diagnosing the causes of high oil consumption.

Crankcase Vacuum Test

Procedure to test crankcase vacuum for proper operation.

Cylinder Leakdown Test

Method for assessing cylinder sealing by pressurizing the combustion chamber.

Leakdown Test Results

Interpretation of leakdown test results to diagnose engine component condition.

Section 5 Fuel System and Governor

Carburetor

General information and troubleshooting for Keihin carburetors.

Adjusting Low Idle Speed and Fuel (Some Models)

Step-by-step guide for setting low idle speed and fuel mixture.

Troubleshooting Procedure

Procedures for diagnosing EFI system issues.

Section 5A LPG Fuel Systems

Troubleshooting Checklist

Initial checks for common LPG engine problems.

Section 5B Electronic Fuel Injection (EFI) Fuel System

Initial Starting/Priming Procedure

Steps for priming the EFI fuel system before initial start.

Important Service Notes!

Critical precautions and guidelines for servicing the EFI system.

Electronic Control Unit (ECU)

Description and types of ECUs used in EFI systems.

Idle Speed Adjustment (RPM)

Adjusting the engine's idle speed.

Initial Governor Adjustment

Critical initial adjustment for EFI governor systems.

Troubleshooting

General approach to troubleshooting EFI system problems.

Troubleshooting Guide

Common EFI engine starting and running issues.

Section 6 Lubrication System

Oil Recommendations

Guidelines for selecting proper oil type and viscosity.

Checking Oil Level

Procedure for checking and maintaining the correct engine oil level.

Changing Oil and Oil Filter

Steps for performing oil changes and filter replacements.

Testing

Procedure for testing the Oil Sentry™ switch.

Section 7 Retractable Starter

WARNING: Spring Under Tension!

Critical safety warning about spring tension in retractable starters.

Section 8 Electrical System and Components

Battery Test

Procedure for testing battery voltage under load.

Test 2. Test for spark.

How to test for spark on both cylinders.

Test Procedure for SMART-SPARK™ Ignition Systems

Procedures for troubleshooting SMART-SPARK™ ignition.

Engine Speed Sensor

Function and testing procedures for the engine speed sensor.

Throttle Position Sensor (TPS)

Function, general information, and service for the TPS.

TPS Initialization Procedure

Crucial steps to re-establish baseline relationship between ECU and TPS.

Oxygen Sensor

Function, general information, and service for the oxygen sensor.

Electrical Relay

Function and testing of the electrical relay.

Fuel Injectors

Mounting, O-rings, and testing of fuel injectors.

Ignition System

Overview of the EFI system's ignition components.

Fuel Pump

General information and service for electric fuel pumps.

Fuel Pressure Regulator

Function and service procedures for the fuel pressure regulator.

Fault Codes

Explanation of how fault codes are accessed and displayed via the MIL.

Flow Chart Diagnostic Aids

Aids to help interpret diagnostic codes and troubleshooting flow charts.

Section 9 Disassembly

Disconnect Spark Plug Leads

Procedure for safely disconnecting spark plug leads.

Shut Off Fuel Supply

Steps to safely shut off the fuel supply before disassembly.

Drain Oil from Crankcase and Remove Oil Filter

Procedure for draining engine oil and removing the oil filter.

Section 10 Inspection and Reconditioning

Measuring Piston-to-Bore Clearance

Procedure for accurately measuring piston-to-bore clearance.

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