Kohler CH18, CH20, CH22, CH25 Command Engine Service Manual 1991-1997

Diagnostic, removal, and maintenance procedures for Kohler CH18-CH25 Command engines: fuel system, ignition, governor, and electrical systems. Part 24 455 04-S.

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Document Details

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Document Number / Seller:
26671 / Thomas Peterson
File Size:
12.57 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Engines (Gasoline)
Last updated / verified
Oct 6, 2025

Models Covered & Key Technical Specifications

Kohler CH18-CH25 Command Engine Service Manual 1991-1997

Diagnostic, removal, and maintenance procedures for Kohler CH18-CH25 Command engines: fuel system, ignition, governor, and electrical systems. Part 24 455 04-S.

  • Factory Power Draw: 13.4-18.8 HP establishes the maximum output capacity.
  • Essential Ambient Limits: For optimal operation, 35°C defines the environmental limit Framework.
  • Key Power Rating: 4.7 N-m -- signifies the blower housing mounting torque Threshold.
  • Verified Circuit Specs: The EFI system requires 7.0 volts to operate Logic.
  • Designated Fuel Type: Unleaded gasoline is recommended for engine operation Parameters.
  • Approved Ignition Timing: Timing is controlled by the ECU to maintain peak performance Range.

Professional Workshop Service Manual & Technical Specifications

Unified Training Safety Manual: Kohler CH18 CH20 CH22 CH25 Command Engine Service Manual - 1991-1997 Precision Maintenance & Troubleshooting Specification-Guide

Performance-Values: CH18-25 // Conceptual-Layout: Engines (Gasoline) / EFI Logic // Performance-Values: 12.5 MB Specification System-Path Logic
CH18-25 Engine Identification Data
Power (@ 3600 RPM) Specifications Values
Peak Torque Curves Data
Bore Specifications Measurements
Compression Ratio Data Values
Dry Weight Specifications Measurements

The documentation provides guidance on system operation descriptions cover diagnostics, electrical components, fuel system, governor, and ignition. Assembly instructions are detailed for electrical systems and fuel components. Hydraulic schematics are included for fuel system components. Steering component information is provided for fuel delivery. This manual documents torque specifications for blower housing mounting to ensure proper flange face sealing.

System operation descriptions cover

This manual provides comprehensive details on engine operation and component function, focusing on the EFI system. It outlines the roles of various sensors and the Engine Control Unit (ECU) in managing fuel delivery and ignition timing to maintain optimal air/fuel ratios and emissions.

The documentation addresses

Key electrical components, including the ECU, engine speed sensor, and throttle position sensor, are thoroughly detailed. Troubleshooting guides for common faults and diagnostic codes are provided to assist in identifying and resolving issues.

Assembly instructions are detailed for

Specific procedures for the fuel pump, fuel pressure regulator, and fuel filter are outlined, ensuring correct installation and operation of the fuel delivery system.

Hydraulic schematics are included for

While the focus is on EFI components, the manual implicitly covers hydraulic principles related to fuel delivery within the system.

Steering component information is provided for

This information pertains to the throttle linkage and governor assembly, detailing their adjustment and function for precise engine speed control.

FAQ

Specify the **applicable** lubrication requirements for the engine? keyboard_arrow_down

10W-30 weight oil is recommended for most operating conditions, with a minimum of 250 cold cranking amps for the battery to ensure reliable system operation.

What is the **exact** testing parameters for the ECU power circuit? keyboard_arrow_down

7.0 volts is the minimum operating voltage for the ECU; if system voltage drops below this level, intermittent or disrupted operation can occur.

Calculate the **specific** diagnostic procedures for a "limp-home" mode related to the TPS signal? keyboard_arrow_down

When a "limp-home" mode occurs, the ECU operates on "open loop" control, prioritizing the oxygen sensor for fuel delivery adjustments, which may lead to rich running and reduced efficiency.

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The manual covers everything I needed for my Kohler engine. The diagrams are particularly helpful!
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This manual is a lifesaver! The troubleshooting section helped me fix my engine issue quickly. Highly recommend it!
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Rated 4 out of 5 stars
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I received the download link via email almost immediately. The support team was very helpful with my questions!