Rehlko Command Pro CH680-3012 22.5HP Flush Crankshaft
Walker Replacement for CH23S-76634
The Rehlko Command Pro CH680-3012 22.5HP engine (formerly Kohler Command Pro) is a commercial-grade V-Twin engine engineered for demanding equipment that requires reliable power, durability, and direct-drive compatibility.
Built with a 674cc 4-stroke OHV V-Twin design, this engine delivers 22.5 horsepower and 36.8 ft-lbs of peak torque, making it ideal for zero-turn mowers (including Walker systems), industrial equipment, generators, and construction machinery. The flush crankshaft configuration is specifically designed for direct-coupled applications, eliminating the need for extended shaft modifications and ensuring precise alignment with compatible systems.
If you're replacing a Walker mower engine (CH23S-76634) or upgrading to a modern commercial engine platform, the CH680-3012 offers improved performance, long-term serviceability, and OEM-grade reliability.
Key Features & Benefits
- 22.5HP Commercial Power – High-output V-Twin engine built for continuous-duty applications
- Flush Crankshaft Design – Perfect for direct-drive systems (Walker mowers & specialty equipment)
- 674cc OHV Engine – Optimized combustion for fuel efficiency and torque delivery
- Electric Start System – Reliable ignition with heavy-duty 12V starter
- 36.8 ft-lbs Peak Torque – Strong low-end performance for heavy loads
- Pressure Lubrication System – Extends engine life under demanding conditions
- Forced Air Cooling – Maintains optimal operating temperatures
- 20AMP Charging System – Supports electrical components and accessories
- Fully Rebuildable Engine Platform – Long-term serviceability and parts availability
- 3-Year Consumer & Commercial Warranty – Confidence for both professional and residential use
Ideal Applications
This engine is commonly used in:
- Walker Zero-Turn Mowers (Flush Shaft Required)
- Commercial lawn care and landscaping equipment
- Industrial machinery and construction equipment
- Pressure washers and power systems
- Generator applications requiring high torque output
Cross Reference & Compatibility
- Direct Replacement For: CH23S-76634 (Walker)
- Compatible with equipment requiring:
- Flush crankshaft engines
- 4-bolt mounting pattern
- High-torque V-Twin output
Why Choose the Rehlko CH680-3012?
The CH680-3012 stands out because of its specialized flush crankshaft design, which is not commonly found in standard small engines. This makes it the go-to solution for Walker mower replacements and direct-drive equipment where precision fitment matters. Combined with commercial-grade durability, rebuildable components, and strong torque output, this engine is designed to reduce downtime, increase productivity, and deliver consistent performance in demanding environments.
Frequently Asked Questions
What equipment is the CH680-3012 engine used for?
The CH680-3012 is primarily used in Walker zero-turn mowers, as well as commercial landscaping equipment, generators, and industrial machinery requiring a flush crankshaft design.
What does a flush crankshaft mean?
A flush crankshaft means the output shaft does not extend beyond the engine housing, making it ideal for direct-drive systems where the engine mounts directly to the equipment without additional shaft length.
Is the CH680-3012 a replacement for Kohler engines?
Yes. The Rehlko CH680-3012 replaces older Kohler Command Pro models, including CH23S-76634, while maintaining compatibility and improving performance.
How much horsepower does the CH680-3012 produce?
This engine produces 22.5 horsepower with 36.8 ft-lbs of peak torque, making it suitable for heavy-duty applications.
Is this engine good for commercial use?
Yes. The CH680-3012 is a commercial-grade engine with a 3-year commercial warranty, built for continuous operation in demanding environments.
Does this engine come with a fuel tank or muffler?
No. The engine does not include a fuel tank or muffler, allowing you to configure it based on your equipment setup.
What type of fuel should I use?
Use unleaded gasoline with a minimum of 86 octane for optimal performance and longevity.
Is the engine rebuildable?
Yes. This engine is fully rebuildable, making it a long-term investment with accessible replacement parts and serviceability.
Reach out to us at 1-888-208-2088 to place your order or receive expert guidance. With quick shipping, top-notch quality, and exceptional support, Carroll Stream Motor Company is your reliable choice for commercial-grade small engines!
Add Genuine OEM Kawasaki Fuel Treatment. This 12oz bottle is designed to help protect your engine!
| Specifications | |
|---|---|
| Make | Rehlko |
| Model | CH680-3012 |
| Type | Small Engine |
| Fuel | Gas Unleaded 86 Octane or Higher |
| Engine Type | 4 Stroke OHV V-Twin |
| Bore/Stroke | 3.2 X 2.6 in |
| Displacement | 674cc |
| Max Power | 22.5HP |
| Starting Type | Electric Start |
| Charging System | 20AMP W/Regulator |
| Starting System | Stater, 12 Volt Heavy Duty |
| Dimensions (L x W x H) | 14 x 17.75 x 19 in. |
| Muffler Included | No |
| Fuel Tank | No |
| Dry Engine Weight | 90 lbs. |
| Shaft Type | Keyed - Straight |
| Shaft Diameter | Flush Crankshaft |
| Shaft Length | Flush Crankshaft |
| Shaft I.D. Thread Size | N/A |
| Bolt Pattern | 4 Bolt |
| Oil System | Pressure lubrication |
| Oil Capacity | 2 Qts |
| Peak Torque | 36.8 Ft. Lbs. |
| Reduction Type | None |
| Engine Cooling Type | Forced Air Cooling |
| Features | |
| 3 Year Consumer Warranty | |
| 3 Year Commercial Warranty | |
| Mechanical Governor | |
| 4 Stroke OHV Small Engine | |
| Flush Crankshaft | |
| Dipstick in Crankcase | |
| Cross Reference Guide | |
| Superseded From:CH23S-76634 WALKER | |
| Accessories | |
| Oil Cooler | |
| User Manual | |
Use to Replace Model Numbers:
CH23S-76634 WALKER, Superseded From: KOHPA-76634,
Any cross-reference is provided as a courtesy. You will be responsible for making sure the part number we are providing will fit your application. If you are unsure, please contact us before purchasing for help. Please have your model and serial number available.
