Kohler Command PRO CH640 User Manual

24 590 48 Rev. --
KohlerEngines.com
Owner's Manual
IMPORTANT:
Read all safety precautions and instructions carefully before operating
equipment. Refer to operating instruction of equipment that this engine powers.
Ensure engine is stopped and level before performing any maintenance or
service.
Warranty coverage as outlined in the warranty card and on KohlerEngines.
com. Please review carefully as it provides your specifi c rights and obligations.
To maintain compliance with applicable emission regulations, exhaust system
backpressure may not exceed limits which can be found on KohlerEngines.
com. Search by Model No., then select Specs tab.
Kohler Engines has published CO2 values on KohlerEngines.com website.
Record engine information to reference when ordering parts or obtaining warranty coverage.
Engine Model
Specifi cation
Serial Number
Purchase Date
CH640, CH730, CH740
Liquefi ed Petroleum Gas (LPG) or LPG/Natural Gas (NG) Fueled

Kohler Command PRO CH640 Specifications

General

Compression Ratio	8.5:1
Fuel System	Carburetor
Cooling System	Air-cooled
Ignition System	Electronic
Starter	Electric
Engine Type	4-cycle, OHV, twin-cylinder
Displacement	624 cc
Bore x Stroke	3.03 x 2.64 in. (77 x 67 mm)
Power	20.5 hp (15.3 kW)
Lubrication	Full Pressure
Oil Capacity	2.0 qt. (1.9 L)

Summary

General Safety Precautions

Fuel Hazards

Warnings on LPG/NG flammability and explosion risks.

Carbon Monoxide Danger

Risks of inhaling toxic exhaust fumes.

Hot Surface Burns

Caution against touching hot engine parts.

Electrical Shock Risk

Warning about touching live wires.

Accidental Start Hazards

Safety measures to prevent accidental starts during service.

Rotating Part Injuries

Danger from moving engine components.

California Prop 65 Warning

Chemical exposure notification for California residents.

Pre-Start Checklist

Engine Operation Procedures

Cold Weather Starting

Tips for starting the engine in cold conditions.

Engine Stopping

Correct procedures for shutting down the engine.

Angle of Operation Limits

Maximum tilt angles to prevent lubrication issues.

Engine Speed Control

Importance of not exceeding maximum engine speed.

Maintenance Schedule and Instructions

Maintenance Intervals

Recommended service intervals for engine upkeep.

Oil Management and Service

Oil Recommendations

Guidelines for selecting and using engine oil.

Checking Engine Oil Level

Procedure for verifying and topping up oil.

Oil and Filter Change

Step-by-step guide for replacing oil and filter.

Fuel System and Conversion

Oil Sentry System

Function of the low oil shutdown feature.

Fuel Type Recommendations

Guidance on using LPG and Natural Gas fuels.

Fuel Type Conversion

Steps to switch between LPG and NG fuel sources.

LPG System Components

LPG Regulator Service

Information regarding the LPG regulator maintenance.

Lock-Off/Filter Assembly

Role of the assembly in filtering fuel.

Vaporizer Function

How the vaporizer converts LPG to gas.

Spark Plug Maintenance

Guide for checking and replacing spark plugs.

Air Cleaner Service

Procedures for cleaning and replacing the air filter.

Breather Tube Check

Ensuring the breather tube is correctly connected.

Engine Cooling, Service, and Storage

Oil Cooler Maintenance

Instructions for cleaning the oil cooler fins.

Air Cooling System Care

Importance of keeping cooling surfaces clean.

Repairs and Service Parts

Guidance on using authorized dealers for service.

Fuel Leakage Testing

Method for detecting fuel system leaks.

Long-Term Storage Preparation

Steps for storing the engine for extended periods.

Troubleshooting Guide

Specifications and Emissions

Emission Control System Details

Information on the engine's emission control system.