Kohler Command PRO CH26 - User Manual

Kohler Command PRO CH26

140 pages

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ECH630-ECH749, CH735, CH26, CH745

Service Manual

KohlerEngines.com 124 690 01 Rev. K

2 Safety

3 Maintenance

5 Speciﬁ cations

22 Tools and Aids

25 Troubleshooting

29 Air Cleaner/Intake

30 Electronic Fuel Injection (EFI) System-ECH

59 Electronic Fuel Injection (EFI) System-Bosch

92 Lubrication System

94 Electrical System

99 Starter System

103 Disassembly/Inspection and Service

122 Reassembly

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.

Table of Contents

Questions and Answers

A
amberdominguezAug 19, 2025
Why is my Kohler Command PRO CH26 engine hard to start?
- A
  Amanda WarrenAug 19, 2025
  If your Kohler Crankshaft engine is hard to start, consider the following: * Ensure the PTO drive isn't engaged. * Check for dirt or water in the fuel system or a clogged fuel line. * Inspect for loose or faulty wires or connections. * Verify the choke or throttle controls aren't faulty or misadjusted. * Look for faulty spark plugs, low compression, or a weak spark. * Check the fuel pump for malfunction, ensuring it's providing enough fuel. * Ensure the engine isn't overheating due to restricted cooling or air circulation. * Consider the fuel quality, a sheared flywheel key, or an intake system leak.
J
James RobertsonAug 21, 2025
What to do if my Kohler Crankshaft engine will not crank?
- J
  Justin BaldwinAug 21, 2025
  If your Kohler Crankshaft engine won't crank, check these items: * Ensure the PTO drive isn't engaged. * Verify the battery isn't discharged. * Confirm the safety interlock switch isn't engaged. * Inspect for loose or faulty wires or connections. * Check the key switch or ignition switch for faults. * Examine the electric starter or solenoid for faults. * Consider seized internal engine components.
J
Julie MitchellAug 25, 2025
What to do if Kohler Crankshaft operates erratically?
- S
  seanbennettAug 25, 2025
  If your Kohler Crankshaft operates erratically, it is recommended to have a Kohler authorized dealer service or replace major engine components.
S
Stephen GarciaAug 28, 2025
Why does my Kohler Crankshaft engine start but not keep running?
- R
  rblackAug 28, 2025
  If your Kohler Crankshaft engine starts but doesn't keep running, consider these potential causes: * A restricted fuel tank cap vent. * Poor fuel quality, or dirt or water in the fuel system. * Faulty or misadjusted choke or throttle controls. * Loose wires or connections shorting the ignition module's kill terminal to ground. * A faulty cylinder head gasket or carburetor. * Vacuum fuel pump malfunction, or oil in the vacuum hose. * A leaking or cracked vacuum hose to the fuel pump. * An intake system leak.
A
Andrea HarperAug 30, 2025
How to fix a Kohler Crankshaft engine that loses power?
- A
  Ashley MartinAug 30, 2025
  If your Kohler Crankshaft engine is losing power, here are a few things to investigate: * Check the crankcase oil level (it might be low or high). * Inspect the air cleaner element for dirt. * Look for dirt or water in the fuel system. * Reduce excessive engine load. * Ensure the engine isn't overheating. * Check the spark plugs for faults. * Consider low compression or exhaust restriction. * Check for SMART-SPARK™ malfunction (if applicable). * Verify the battery isn't low and the governor setting is correct.
J
James EvansSep 1, 2025
What causes my Kohler Command PRO CH26 Crankshaft engine to overheat?
- J
  jensenshannonSep 1, 2025
  Several factors can cause your Kohler Crankshaft engine to overheat: * Clogged air intake/grass screen, cooling fins, or cooling shrouds. * Excessive engine load. * Low or high crankcase oil level. * Faulty carburetor. * Lean fuel mixture. * SMART-SPARK™ malfunction (if applicable).
P
Patricia RodriguezSep 3, 2025
Why does my Kohler Command PRO CH26 engine run but misses?
- K
  Kevin JoyceSep 3, 2025
  If your Kohler Crankshaft engine runs but misses, the following could be the reason: * Dirt or water in the fuel system. * A disconnected spark plug lead. * Poor fuel quality. * Faulty spark plug(s). * Loose wires or connections intermittently grounding the ignition kill circuit. * The engine is overheated. * A faulty ignition module or incorrect air gap. * The carburetor is adjusted incorrectly. * SMART-SPARK™ malfunction (if applicable).
A
Amber CannonSep 5, 2025
How to troubleshoot a Kohler Command PRO CH26 engine that will not idle?
- N
  nhunterSep 6, 2025
  If your Kohler Crankshaft engine won't idle, check these potential issues: * Dirt or water in the fuel system. * Stale fuel and/or gum in the carburetor. * Faulty spark plugs. * Inadequate fuel supply. * Improperly set idle speed adjusting screw or idle fuel adjusting needle (on some models). * Low compression. * Restricted fuel tank cap vent. * Engine overheating due to cooling system/air circulation problems.
R
reynoldsloriSep 7, 2025
What causes a knocking sound in my Kohler Command PRO CH26 Crankshaft engine?
- R
  Rose RomeroSep 7, 2025
  A knocking sound in your Kohler Crankshaft engine can be caused by: * Excessive engine load. * Low crankcase oil level. * Old or improper fuel. * Internal wear or damage. * Hydraulic lifter malfunction. * Poor fuel quality. * Incorrect grade of oil.
R
robin73Sep 9, 2025
Why is my Kohler Command PRO CH26 engine using an excessive amount of oil?
- G
  gcherrySep 10, 2025
  Excessive oil consumption in your Kohler Crankshaft engine can stem from: * Incorrect oil viscosity/type. * A clogged or improperly assembled breather. * A broken breather reed. * Worn or broken piston rings. * A worn cylinder bore. * Worn valve stems/valve guides. * An overfilled crankcase. * A blown head gasket or overheating.

Kohler Command PRO CH26 Specifications

General

Fuel Type	Gasoline
Cooling System	Air-cooled
Compression Ratio	8.5:1
Crankshaft Orientation	Horizontal
Engine Type	OHV
Starting System	Electric start

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