Kohler Command Pro ECH630 – ECH749 CH735 CH26 CH745 Factory Service Repair Manual

Since 1873, Kohler Co. has been improving the level of gracious living by providing exceptional products and services for our customers’ homes and their lifestyles. We believe better business and a better world go hand-in-hand. Fueled by the passion of more than 40,000 associates worldwide, we strive to enhance the quality of life for current and future generations through design, craftsmanship and innovation.

• Fuel efficiency: The closed-loop EFI system constantly optimizes the air-fuel mixture, providing up to 25% better fuel economy compared to similar-sized carbureted engines.
• Easy starting: The EFI system provides reliable, choke-free, car-like starting in a wide range of temperatures.
• Durable construction: All engines in the series feature cast-iron cylinder liners, an oil cooler, and a full-pressure lubrication system with a full-flow filter for extended engine life.
• Models: The ECH series includes models like the ECH630 (19 HP, 694cc), ECH680 (23 HP, 694cc), ECH730 (23 HP, 747cc), ECH740 (25 HP, 747cc), and ECH749 (26.5 HP, 747cc). 

• Engine design: Utilizes a carburetor and a mechanical governor.
• Durable construction: Shares many durable construction features with the EFI models, including cast-iron cylinder liners and full-pressure lubrication, though some may lack an integrated oil cooler.
• Models: The CH series includes models like the CH26 (26 HP, 725cc), CH735 (26 HP, 725cc), and CH745 (28 HP, 725cc). 

• Overheating (CH series): Carbureted CH models can be susceptible to overheating, which may be caused by clogged cooling fins, improper fuel mixtures, or a dirty air filter.
• Ignition coil failure (Both series): Ignition coil failures have been reported, sometimes causing the engine to bog down, lose power, or simply fail to fire on one cylinder, especially when the engine is hot.
• EFI system issues (ECH series): While less common than with carburetors, problems with the EFI system, such as a faulty fuel pump or oxygen sensor, can lead to poor performance or starting issues.
• Carburetor clogging (CH series): As with most carbureted engines, the CH series can experience performance problems due to ethanol in modern gasoline, which can cause fuel residue and clogging. 

• Tune-up kits: Maintenance kits, which typically include air filters, fuel filters, oil filters, and spark plugs, can be purchased from retailers like eBay and Rehlko Engines.
• Fuel pumps: OEM fuel pumps for the EFI ECH series are available from sellers on eBay and other parts retailers.
• Carburetors: Replacement carburetors and carburetor rebuild kits for the CH series are available from retailers like eBay and eReplacementParts.
• Service manuals: Service manuals covering the EFI ECH630–ECH749 and carbureted CH735/CH26/CH745 models can be found online at sites like Etsy and Slideshare.
• Hydraulic lifters: Replacement hydraulic lifters, which help maintain valve timing without manual adjustment, can be purchased from retailers like eBay. 

• Small Engine Warehouse: Offers complete new Kohler Command PRO EFI engines, such as the ECH749-3120, for replacement.
• eBay: Find a wide selection of new and used parts, as well as complete engines, for both ECH and CH series.
• Rehlko Engines: Specializes in Kohler engines and parts, offering diagrams and OEM parts for various CH and ECH models.
• eReplacementParts: Offers genuine OEM parts and accessories for many Command PRO models, including air filters, fuel pumps, and gaskets.
• Official Kohler Website: Utilize the “Find a Dealer” tool on the Kohler Engines website to locate authorized dealers for genuine parts and service