Kohler Command PRO ECH730 User Manual (English)

Questions and Answers:

A
Andrew JosephAug 22, 2025
Why won't my Kohler Crankshaft engine crank?
- A
  Angela ReedAug 23, 2025
  If your Kohler Crankshaft engine won't crank, begin by ensuring the PTO drive is disengaged. A discharged battery is a common culprit; charge or replace it. Also, check if the safety interlock switch is engaged and disengage it. Loose or faulty wires or connections can prevent cranking; secure them. Other potential causes include a faulty key switch or ignition switch (replace if faulty), a faulty electric starter or solenoid (replace if faulty), or seized internal engine components (inspect and repair). A blown fuse, a faulty electronic control unit, or insufficient voltage to the electronic control unit can also prevent the engine from cranking; address these issues as necessary.
M
Marvin HaynesAug 28, 2025
What causes a Kohler Crankshaft engine to lose power?
- D
  douglasfuentesAug 28, 2025
  If your Kohler Crankshaft engine is losing power, several factors could be contributing. Begin by checking the crankcase oil level; refill if low or drain if high. A dirty air cleaner element can restrict airflow; clean or replace it. Also, dirt or water in the fuel system can cause power loss; check and replace the fuel if necessary. Excessive engine load can also cause this issue; reduce the load. Other potential causes include an overheated engine (ensure proper cooling), faulty spark plugs (replace them), low compression (perform a compression test and repair), an exhaust restriction (clear any restrictions), a low battery (charge or replace it), or an incorrect governor setting (adjust the setting).
K
ktranAug 30, 2025
What should I do if my Kohler Command PRO ECH730 Crankshaft engine overheats?
- E
  Eric HollowayAug 31, 2025
  If your Kohler Crankshaft engine is overheating, several factors could be the cause. Start by checking for clogged air intake/grass screens, cooling fins, oil cooler, or cooling shrouds; clean these components to ensure proper airflow. Excessive engine load can also cause overheating; reduce the load. Check the crankcase oil level; refill if low or drain if high. A lean air-fuel mixture can also contribute to overheating; adjust the air-fuel mixture to the proper levels.
R
rstoutSep 2, 2025
Why does my Kohler Command PRO ECH730 engine run but miss?
- C
  Connie Wallace MDSep 2, 2025
  If your Kohler Crankshaft engine runs but misses, several factors could be responsible. Start by checking for dirt or water in the fuel system; check and replace the fuel as necessary. Ensure the spark plug lead is connected. Poor fuel quality can also cause missing; use proper fuel quality. Other potential causes include faulty spark plugs (replace them), loose wires or connections (secure them), an overheated engine (ensure proper cooling), a faulty ignition module (replace it), an incorrect crankshaft position sensor air gap (adjust it), or insufficient voltage to the electronic control unit (ensure proper voltage supply).
A
amandaduranSep 5, 2025
What causes a Kohler Command PRO ECH730 engine to knock?
- K
  keithalexSep 5, 2025
  If your Kohler Crankshaft engine is knocking, several factors could be the cause. Excessive engine load can cause knocking; reduce the load. Check the crankcase oil level; refill if low. Old or improper fuel can also cause knocking; use fresh and appropriate fuel. Other potential causes include internal wear or damage (inspect and repair internal engine components), hydraulic lifter malfunction (repair or replace), improper fuel quality (use proper fuel quality), or an incorrect grade of oil (use the correct grade of oil).
K
Kristen RobertsSep 8, 2025
Why won't my Kohler Command PRO ECH730 Crankshaft engine idle properly?
- E
  ecraigSep 8, 2025
  If your Kohler Crankshaft engine will not idle, several factors could be responsible. Start by checking for dirt or water in the fuel system; check and replace the fuel as necessary. Stale fuel or dirty fuel injectors can also cause idling issues; replace stale fuel or clean the fuel injectors. Other potential causes include faulty spark plugs (replace them), an inadequate fuel supply (ensure adequate fuel supply), low compression (perform a compression test and repair), a restricted fuel tank cap vent (clear the vent), or an overheated engine due to cooling system or air circulation problems (ensure proper cooling and air circulation).

Kohler Command PRO ECH730 Specifications

General

Fuel System	Carburetor
Cooling System	Air-cooled
Compression Ratio	8.5:1
Ignition System	Electronic
Governor Type	Mechanical
Crankshaft Type	Forged Steel
Crankshaft Orientation	Horizontal
Displacement	725 cc
Starting System	Electric
Starter	Electric
Engine Type	4-Cycle, Gasoline, OHV, Twin Cylinder
Oil Capacity	2.0 U.S. quarts (1.9 liters)
Shaft Type	Keyed
Lubrication System	Full Pressure
Crankshaft Diameter	1-1/8 inch

Summary

Safety and General Information

Safety Precautions

Essential safety guidelines and warnings for engine operation and maintenance.

Engine Identification Numbers

Explanation of engine model, specification, and serial number identification.

Oil Recommendations

Guidance on selecting the correct oil type and viscosity for engine lubrication.

Fuel Recommendations

Guidelines for using appropriate gasoline types, blends, and storage.

Periodic Maintenance Instructions

Schedule and overview of regular maintenance tasks for the engine.

General Specifications

Key technical data including power, bore, stroke, displacement, and weight.

General Torque Values

Recommendations for tightening metric fasteners based on property class.

Tools & Aids

Tools

List of specialized tools required for engine service and their sources.

Aids

List of approved lubricants, sealants, and other service aids.

Special Tools You Can Make

Instructions for fabricating specific tools for engine maintenance.

Troubleshooting

Troubleshooting Guide

Categorized list of common engine problems and potential causes.

Engine Cranks But Will Not Start

Diagnosing issues when the engine attempts to crank but fails to start.

Engine Overheats

Identifying causes and solutions for engine overheating problems.

Crankcase Vacuum Test

Procedure for testing crankcase vacuum and diagnosing related issues.

Cylinder Leakdown Test

Method for testing cylinder integrity and diagnosing valve or ring issues.

Air Cleaner and Air Intake System

Heavy-Duty Air Cleaner

Description, service, and removal procedures for the heavy-duty air cleaner.

Low-Profile Air Cleaner (Optional)

Description and service for the optional low-profile air cleaner.

Air Intake/Cooling System

Ensuring proper engine cooling by maintaining clean air intake and fins.

Electronic Fuel Injection (EFI) System

EFI Fuel System Components

Overview of the main components within the EFI system.

Operation

Explanation of how the EFI system manages fuel and ignition for optimal performance.

Electronic Control Unit (ECU)

Description, function, and service notes for the engine control unit.

Crankshaft Position Sensor

Function, service, and testing of the crankshaft position sensor.

Throttle Position Sensor (TPS)

Role, service, and testing of the throttle position sensor.

ECU Reset and TPS Learn Procedure

Procedure for resetting the ECU and relearning TPS values.

Fault Codes

Guide to reading and interpreting diagnostic fault codes for the EFI system.

Lubrication System

Oil Recommendations

Guidance on selecting the correct oil type and viscosity for engine lubrication.

Check Oil Level

Procedure for checking and maintaining the proper engine oil level.

Changing Oil and Oil Filter

Steps for performing routine oil and oil filter changes.

Oil Sentry™

Description and function of the optional low oil pressure switch.

Electrical System and Components

Spark Plugs

Information on spark plug types, gap, service, and inspection.

Battery

Battery recommendations, maintenance, and testing procedures.

Battery Charging System

Overview of the charging system and guidelines to avoid damage.

Rectifier-Regulator

Testing procedure for the rectifier-regulator component.

Electric Starting Motors

Precautions, removal, and installation of electric starting motors.

Solenoid Test Procedure

Detailed tests for the starter solenoid's pull-in and hold-in coil functions.

Disassembly

General

Instructions for cleaning parts and removing residual cleaners.

Typical Disassembly Sequence

A suggested order for disassembling engine components.

Drain Oil from Crankcase and Remove Oil Filter

Procedure for draining engine oil and removing the oil filter.

Remove Air Cleaner Assembly

Steps for removing both heavy-duty and low-profile air cleaner assemblies.

Remove Throttle Body

Procedure for disconnecting and removing the throttle body.

Remove Fuel Injectors

Steps for disconnecting and removing the fuel injectors.

Remove Cylinder Heads and Hydraulic Lifters

Procedure for removing cylinder heads and associated components.

Remove Fan and Flywheel

Steps for removing the fan and flywheel from the crankshaft.

Remove Closure Plate Assembly

Procedure for removing the closure plate assembly from the crankcase.

Remove Connecting Rods with Pistons and Rings

Procedure for removing connecting rods, pistons, and rings.

Remove Crankshaft

Procedure for carefully removing the crankshaft from the crankcase.

Inspection and Reconditioning

Camshaft

Inspection procedures for the camshaft and its gear.

Crankshaft

Inspection of crankshaft gear teeth, bearing surfaces, and keyways.

Crankcase

Inspection of gasket surfaces and cylinder bore for wear or damage.

Honing

Procedure for honing cylinder bores to proper size and finish.

Cylinder Head and Valves

Inspection of cylinder head flatness and valve mechanism parts.

Pistons and Rings

Inspection of pistons and rings for damage, wear, and proper fit.

Reassembly

General

Notes on using specified torques, clearances, and fresh sealants.

Typical Reassembly Sequence

A suggested order for reassembling engine components.

Install Crankshaft

Procedure for lubricating and installing the crankshaft.

Install Connecting Rods with Pistons and Rings

Steps for installing piston assemblies into cylinder bores.

Install Camshaft

Procedure for lubricating and installing the camshaft.

Thrust Bearing, Washer and Shim

Correct sequence for installing crankshaft end play components.

Install Stator and Backing Plate

Procedure for installing the stator and backing plate.

Install Flywheel

Procedure for installing the flywheel onto the crankshaft.

Install Hydraulic Lifters and Cylinder Heads

Steps for installing hydraulic lifters and cylinder heads.

Assemble Cylinder Heads

Procedure for assembling valves, springs, and retainers into cylinder heads.

Install Push Rods and Rocker Arms

Procedure for installing push rods and rocker arms.

Install Spark Plugs

Procedure for installing and torquing spark plugs.

Install Intake Manifold

Procedure for installing the intake manifold with gaskets.

Install Fuel Injectors

Procedure for installing fuel injectors and their retaining clips.

Install Crankshaft Position Sensor

Procedure for installing the crankshaft position sensor and bracket.

Install Valve Covers

Procedure for installing valve covers with new gaskets and O-rings.

Install Blower Housing and Outer Baffles

Procedure for installing blower housing and outer baffles.

Prepare the Engine for Operation

Final checks and adjustments before starting the engine.

Testing the Engine

Recommended procedures for testing the engine on a stand.

Related product manuals

Kohler Command PRO ECH749

8 pages

Kohler Command PRO ECH740

154 pages

Kohler Command PRO ECH630

8 pages

Kohler Command PRO ECV630

152 pages

Kohler Command PRO ECV749

8 pages

Kohler Command PRO ECV740

152 pages

Kohler Command PRO ECV730

152 pages

Kohler Command CV680

8 pages

Kohler Command PRO CH735

Kohler Command PRO ECH730 User Manual

Table of Contents

Questions and Answers:

Kohler Command PRO ECH730 Specifications

Summary

Safety and General Information

Safety Precautions

Engine Identification Numbers

Oil Recommendations

Fuel Recommendations

Periodic Maintenance Instructions

General Specifications

General Torque Values

Tools & Aids

Tools

Aids

Special Tools You Can Make

Troubleshooting

Troubleshooting Guide

Engine Cranks But Will Not Start

Engine Overheats

Crankcase Vacuum Test

Cylinder Leakdown Test

Air Cleaner and Air Intake System

Heavy-Duty Air Cleaner

Low-Profile Air Cleaner (Optional)

Air Intake/Cooling System

Electronic Fuel Injection (EFI) System

EFI Fuel System Components

Operation

Electronic Control Unit (ECU)

Crankshaft Position Sensor

Throttle Position Sensor (TPS)

ECU Reset and TPS Learn Procedure

Fault Codes

Lubrication System

Oil Recommendations

Check Oil Level

Changing Oil and Oil Filter

Oil Sentry™

Electrical System and Components

Spark Plugs

Battery

Battery Charging System

Rectifier-Regulator

Electric Starting Motors

Solenoid Test Procedure

Disassembly

General

Typical Disassembly Sequence

Drain Oil from Crankcase and Remove Oil Filter

Remove Air Cleaner Assembly

Remove Throttle Body

Remove Fuel Injectors

Remove Cylinder Heads and Hydraulic Lifters

Remove Fan and Flywheel

Remove Closure Plate Assembly

Remove Connecting Rods with Pistons and Rings

Remove Crankshaft

Inspection and Reconditioning

Camshaft

Crankshaft

Crankcase

Honing

Cylinder Head and Valves

Pistons and Rings

Reassembly

General

Typical Reassembly Sequence

Install Crankshaft

Install Connecting Rods with Pistons and Rings

Install Camshaft

Thrust Bearing, Washer and Shim

Install Stator and Backing Plate

Install Flywheel

Install Hydraulic Lifters and Cylinder Heads

Assemble Cylinder Heads

Install Push Rods and Rocker Arms

Install Spark Plugs

Install Intake Manifold