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Kohler COMMAND CH18 - Service Manual

Kohler COMMAND CH18
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SERVICE MANUAL
HORIZONTAL CRANKSHAFT
COMMAND CH18-750

Other manuals for Kohler COMMAND CH18

Preview: Owner's Manual
Owner's Manual20 pages

Questions and Answers

  • C
    Carla OneillAug 16, 2025
    Why does my Kohler COMMAND CH18 Engine start but not keep running?
    • J
      Joseph CruzAug 16, 2025
      If your Kohler Engine starts but doesn't keep running, the issue might stem from several causes: * A faulty carburetor or cylinder head gasket could be the reason. Repair or replace these components as needed. * Check for a fuel pump malfunction, including clogged or leaking vacuum hoses, and address any issues. * Inspect the quality of the fuel, replacing it if it's dirty, stale, or contaminated with water. * Also, ensure that the fuel tank cap vent isn't restricted. * Faulty or misadjusted choke or throttle controls can cause this problem; adjust or repair them. * Finally, look for intake system leaks and repair them, and secure any loose wires or connections that might be grounding the ignition kill circuit intermittently.
  • A
    Alexander LiAug 19, 2025
    What causes a Kohler COMMAND CH18 to knock?
    • K
      Kenneth HardyAug 19, 2025
      If your Kohler Engine knocks, consider these potential causes: * Excessive engine load can cause knocking; reduce the load. * Check the crankcase oil level and add oil if it's low. * Ensure you're using the correct oil viscosity and type. * Poor fuel quality (dirt, water, stale, mixture) can also lead to knocking; inspect and replace the fuel if necessary. * Also, a hydraulic lifter malfunction may be the problem; repair or replace the hydraulic lifter. * Finally, internal wear or damage could be the cause; inspect and repair internal engine components.
  • T
    Timothy WeissAug 26, 2025
    Why is my Kohler COMMAND CH18 Engine overheating?
    • K
      kendra35Aug 26, 2025
      If your Kohler Engine overheats, consider these possible reasons: * A broken cooling fan or failed/off fan belt can cause overheating; repair or replace these components. * Excessive engine load can also lead to overheating; reduce the load. * Check for a faulty carburetor and repair or replace it if necessary. * Ensure the crankcase oil level and cooling system fluid levels are adequate. * A lean fuel mixture can cause overheating; adjust the fuel mixture. * Inspect the radiator and cooling system components for clogs, restrictions, or leaks, and repair them. * Also, check the water pump and its belt for any failures, repairing or replacing them as needed.
  • S
    Stephen CollierAug 28, 2025
    What to do if my Kohler COMMAND CH18 will not crank?
    • N
      Norman LeAug 29, 2025
      If your Kohler Engine will not crank, consider the following: * A discharged battery is a common cause, so charge or replace the battery. * Check the electric starter or solenoid for faults and replace if necessary. * Test the key switch or ignition switch and replace if faulty. * Inspect the interlock switch and replace it if engaged or faulty. * Look for loose wires or connections that might be grounding the ignition kill circuit intermittently and secure them. * Also, inspect the pawls and drive cup for proper engagement, repairing as needed. * Finally, check for seized internal engine components and repair them.
  • N
    Natasha SmithAug 31, 2025
    Why does my Kohler COMMAND CH18 run but miss?
    • J
      Joseph BoydAug 31, 2025
      If your Kohler Engine runs but misses, here's what to investigate: * Start by checking the spark plugs; replace any that are faulty. * Ensure the spark plug leads are securely connected and the lead boot is tight on the plug. * Inspect the ignition module(s) for faults or improper gapping, repairing or adjusting as needed. * Also, check the carburetor adjustment and the crankshaft position sensor air gap, adjusting them if incorrect. * Poor fuel quality (dirt, water, stale, mixture) can cause missing; inspect and replace the fuel if necessary. * Loose wires or connections grounding the ignition kill circuit intermittently can also cause this issue; secure them. * Finally, check the interlock switch and replace it if it's engaged or faulty.
  • B
    Brian NicholsonSep 6, 2025
    How to fix a Kohler COMMAND CH18 Engine that will not idle?
    • W
      wmcclureSep 6, 2025
      If your Kohler Engine won't idle, here's what you can check: * Make sure the engine isn't overheating by allowing it to cool down. * Replace any faulty spark plugs. * Adjust the idle fuel needles and the idle speed screw, as improper settings can prevent idling. * Ensure there's an adequate fuel supply. * Also, check for low compression and rectify any issues. * Poor fuel quality (dirt, water, stale, mixture) can cause idling problems; inspect and replace the fuel if needed. * Finally, clear any restrictions in the fuel tank cap vent.
  • C
    Christopher FisherSep 9, 2025
    Why does my Kohler Engine use an excessive amount of oil?
    • R
      Ryan PenaSep 9, 2025
      If your Kohler Engine uses an excessive amount of oil, here's what might be happening: * Loose or improperly torqued fasteners can cause oil leaks; tighten them properly. * A blown head gasket can lead to excessive oil consumption; repair or replace it. * Check the crankcase breather for clogs, breaks, or inoperability; clean or replace it. * Ensure the crankcase isn't overfilled; drain excess oil to the correct level. * Also, verify that you're using the correct oil viscosity and type. * Worn or broken piston rings, worn cylinder bore or valve stems/guides can cause excessive oil use; inspect and repair or replace these components as needed. * A broken breather reed can also contribute to this issue; repair or replace the breather reed.
  • T
    Travis EstradaSep 12, 2025
    What causes oil leaks from oil seals and gaskets in a Kohler COMMAND CH18?
    • K
      kyle44Sep 12, 2025
      If you notice oil leaks from the oil seals and gaskets of your Kohler Engine, consider these potential causes: * Loose or improperly torqued fasteners can cause leaks; tighten them properly. * A clogged, broken, or inoperative crankcase breather can also be a culprit; clean or replace it. * Piston blow-by or leaky valves may be the cause; inspect and repair the piston or valves. * A broken breather reed can contribute to leaks; repair or replace it. * Finally, check for a restricted exhaust and clear any obstructions.
  • A
    Adam WrightNov 21, 2025
    What to do if my Kohler COMMAND CH18 starts hard?
    • J
      jacksonsarahNov 21, 2025
      If your Kohler Engine starts hard, here's what you should check: * First, ensure the fuel line or fuel filter isn't clogged; clean or replace them if necessary. * Also, verify that the choke and throttle controls are correctly adjusted or repair them if faulty. * A faulty spark plug can make starting difficult, so replace it. * If the engine has overheated, allow it to cool down. * Check the interlock switch and replace it if it's engaged or faulty. * Also, inspect the fuel pump for malfunctions, including clogged or leaking vacuum hoses. * Loose wires or connections grounding the ignition kill circuit intermittently can cause hard starts; secure them. * Low compression or poor fuel quality (dirt, water, stale, mixture) can also be culprits; address these issues as needed....

Summary

Section 1 Safety and General Information

General Safety Precautions

General safety instructions and warnings for safe operation, including definitions of safety symbols.

Fuel and Chemical Safety

Covers warnings related to explosive fuel, carbon monoxide, cleaning solvents, and explosive gas.

Periodic Maintenance and Storage

Schedule for maintenance procedures and instructions for engine storage.

General Specifications

Table of general engine specifications including power, torque, bore, stroke, and displacement.

Torque Values

Recommendations for metric and English fastener torques based on size and grade.

Section 2 Tools & Aids

Separate Tool Suppliers

List of suppliers for specialized tools and their contact information.

Tools

List of tools, their descriptions, and source/part numbers.

Special Tools You Can Make

Instructions for fabricating custom tools like flywheel holder and rocker arm tool.

Section 3 Troubleshooting

Troubleshooting Guide

General guide for common engine starting and running problems.

Engine Starts Hard

List of potential causes for difficulty in starting the engine.

Engine Overheats

List of potential causes for engine overheating.

Cylinder Leakdown Test

Procedure for performing a cylinder leakdown test.

Section 4 Air Cleaner and Air Intake System

Standard Air Cleaner Service

Routine checks and maintenance for the standard air cleaner.

Heavy-Duty Air Cleaner Service

Procedure for servicing the heavy-duty air cleaner paper and inner elements.

Air Intake;Cooling System

Importance of keeping grass screen, cooling fins, and external surfaces clean.

Section 5 Fuel System and Governor

Fuel Recommendations

General recommendations for purchasing and storing gasoline.

Troubleshooting - Carburetor Related Causes

Table of conditions, causes, and probable remedies for carburetor issues.

Fuel Shut-off Solenoid Test

Explanation and test procedure for the fuel shut-off solenoid.

Adjusting Low Idle Speed and Fuel

Step-by-step procedure for adjusting low idle speed and fuel mixture.

Governor Operation and Adjustment

General explanation of the governor's function and procedures for adjustment.

EFI Fuel System Components General

General overview of EFI system components.

Section 6 Lubrication System

Oil Recommendations

Guidance on selecting engine oil type and viscosity based on temperature.

Checking Oil Level

Procedure for checking the engine oil level using the dipstick.

Changing Oil Filter

Procedure for replacing the oil filter.

Oil Sentry Testing

Procedure for testing the Oil Sentry™ switch using compressed air and a tester.

Section 7 Retractable Starter

WARNING: Spring Under Tension!

Warning about spring tension and safety precautions for service.

Rope Replacement

Procedure for replacing the starter rope.

Disassembly

Warning about spring tension and instructions for starter disassembly.

Reassembly

Steps for reassembling the starter assembly.

Section 8 Electrical System and Components

Spark Plug Service

Procedure for removing, checking, and gapping spark plugs.

Battery Test

Procedure for testing battery voltage using a DC voltmeter.

Electronic CD Ignition Systems Operation

Explanation of CD ignition system operation.

SMART-SPARK Ignition Systems Troubleshooting

Procedures for troubleshooting SMART-SPARK™ ignition problems.

Throttle Position Sensor (TPS) Service

Procedure for testing the TPS sensor.

TPS Initialization Procedure

Procedure for initializing the TPS on 35-Pin and 24-Pin ECUs.

Starter Disassembly

Steps for disassembling solenoid shift starters.

Solenoid Test Procedure

Introduction to solenoid testing procedures.

Section 9 Disassembly

General

General instructions for disassembling the engine and cleaning parts.

Typical Disassembly Sequence

Suggested sequence for complete engine disassembly.

Shut Off Fuel Supply

Warning about fuel and procedure for shutting it off.

Drain Oil from Crankcase and Remove Oil Filter

Procedure for draining oil and removing the oil filter.

Remove Air Cleaner Assembly

Procedure for removing the standard air cleaner assembly.

Remove Fuel Pump

Warning about fuel and procedure for removing the fuel pump.

Remove Outer Baffles and Blower Housing

Procedure for removing outer baffles and blower housing.

Remove Cylinder Heads and Hydraulic Lifters

Procedure for removing cylinder heads and hydraulic lifters.

Section 10 Inspection and Reconditioning

Automatic Compression Release (ACR) Operation

Explanation of the ACR mechanism and its operation.

Honing

Procedure for honing the cylinder bore after resizing.

Pistons and Rings Inspection

Causes of piston and ring damage and inspection of piston pin area.

Install New Piston Rings

Procedure for installing new piston rings.

Hydraulic Lifters Inspection

Inspection of hydraulic lifter base surfaces.

“Bleeding” the Lifters

Procedure for bleeding excess oil from hydraulic lifters before installation.

Section 11 Reassembly

General

General instructions for engine reassembly, torque values, and cleaning.

Install Connecting Rods with Pistons and Rings

Procedure for installing connecting rods with pistons and rings, including lubrication and staggering.

Install Camshaft

Procedure for lubricating and installing the camshaft.

Install Ignition Modules

Procedure for installing ignition modules.

Prepare the Engine for Operation

Final checks and preparations before starting the engine.

Section 12 Clutch

Clutch General

Overview of the wet disc type clutch.

Adjustment

Procedure for adjusting the clutch engagement.

Reconditioning

Procedure for reconditioning the clutch.

Kohler COMMAND CH18 Specifications

General IconGeneral
BrandKohler
ModelCOMMAND CH18
CategoryEngine
LanguageEnglish

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