Kohler Command Pro CH740-0045 25HP Exmark Lazer Z Engine
The Kohler Command Pro CH740-0045 is a 25 HP, 725cc commercial horizontal-shaft V-Twin engine configured specifically for select Exmark Lazer Z zero-turn mowers. This engine uses a 1-1/8-inch keyed PTO crankshaft and was produced as an Exmark-specific Command PRO engine rather than a universal CH740 replacement.
The CH740-0045 is especially important when replacing older Exmark engines because the complete Kohler specification number determines crankshaft dimensions, electrical components, air-cleaner configuration, controls and other application-specific features.
Current replacement information: Carroll Stream currently lists the CH740-3117 as the replacement/superseding engine for CH740-0045.
CH740-0045 itself replaced the earlier CH740-0007 Exmark Lazer Z engine specification.
Confirm fitment before ordering. Do not select an Exmark replacement engine based only on "CH740," horsepower or shaft diameter.
Check the complete model/specification number on the original engine and the Exmark mower model and serial number. Contact Carroll Stream Motor Company at 1-888-208-2088 if you need help confirming the correct replacement.
CH740-0045 Key Features
- 25 HP Command PRO: Commercial-duty Kohler horizontal-shaft V-Twin engine.
- 725cc Displacement: Air-cooled 4-cycle OHV V-Twin configuration.
- Exmark Lazer Z Application: Application-specific configuration developed for select Exmark commercial mowers.
- 1-1/8-Inch PTO Shaft: Keyed straight horizontal crankshaft for the applicable Exmark drive system.
- 2.79-Inch Shaft Length: Approximately 1-1/8 inch diameter by 2.79 inches long.
- 1/4-Inch Keyway: Full keyed PTO shaft configuration.
- 7/16-20 Tapped End: Drilled and tapped crankshaft end for the applicable drive installation.
- 12-Volt Electric Start: Electric starting system for equipment integration.
- Full-Pressure Lubrication: Full-flow oil filtration for commercial engine operation.
- Oil Cooler: Helps manage engine oil temperature during sustained operation.
- Heavy-Duty Air Cleaner: Designed for dusty commercial mowing environments.
- 39.2 ft-lb Peak Torque: CH740 engine-family peak torque rating at approximately 3,000 RPM.
Kohler CH740-0045 Specifications
| CH740-0045 Engine Specifications | |
|---|---|
| Manufacturer | Kohler / Rehlko |
| Engine Family | Command PRO |
| Model / Specification | CH740-0045 |
| Manufacturer Part Number | PA-CH740-0045 |
| Primary Application | Select Exmark Lazer Z commercial zero-turn mowers |
| Engine Type | 4-Cycle OHV V-Twin |
| Shaft Orientation | Horizontal |
| Displacement | 725cc / 44.2 cu. in. |
| Gross Power | 25 HP @ 3,600 RPM |
| Peak Torque | 39.2 ft-lb @ approximately 3,000 RPM |
| Bore x Stroke | Approximately 3.27 x 2.64 in. (83 x 67 mm) |
| Starting System | 12-Volt Electric Start |
| Charging System | 15-Amp Alternator |
| Cooling | Forced Air / Air-Cooled |
| Lubrication | Full-Pressure Lubrication With Full-Flow Oil Filter |
| Oil Capacity | Approximately 2.0 US Quarts (1.9 L) |
| Oil Cooler | Yes |
| Air Cleaner | Heavy-Duty Air Cleaner |
| Fuel | Clean, Fresh Unleaded Gasoline – 87 Octane (R+M)/2 or Higher |
| PTO Shaft Type | Keyed Straight Horizontal Shaft |
| PTO Shaft Diameter | 1-1/8 in. |
| PTO Shaft Length | Approximately 2.79 in. |
| Keyway | 1/4 in. |
| Shaft End | 7/16-20 Drilled and Tapped |
| Reduction | None |
| Fuel Tank Included | No |
| Warranty | 3-Year Manufacturer Engine Warranty |
Muffler note: Published CH740-0045 references are inconsistent regarding whether the muffler ships with the current engine package. Confirm the current Carroll Stream inventory configuration before ordering if the exhaust components are important to your installation.
CH740-0045 Exmark Lazer Z Application
The CH740-0045 was produced specifically for Exmark and is documented for Exmark Lazer Z commercial mower applications. This is important because Kohler manufactured many CH740 specification numbers for different equipment manufacturers.
Although several CH740 engines share the same basic 725cc V-Twin architecture, they are not automatically interchangeable. PTO shaft dimensions, charging systems, exhaust components, wiring, controls, air-cleaner systems and accessory configurations can differ by specification number.
What Does CH740-0045 Replace?
CH740-0045 replaced the earlier CH740-0007 Exmark Lazer Z engine specification.
Carroll Stream currently lists CH740-3117 as the newer replacement path for CH740-0045. CH740-3117 maintains the same general Exmark application and 1-1/8-inch by approximately 2.79-inch PTO shaft configuration, but installation details should still be verified before ordering.
| Engine Specification | Replacement Relationship |
|---|---|
| CH740-0007 | Older Exmark specification replaced by CH740-0045 |
| CH740-0045 | Exmark Lazer Z engine covered on this page |
| CH740-3117 | Current Carroll Stream replacement/superseding option for CH740-0045 |
Why the Complete Kohler Specification Number Matters
CH740 identifies the basic engine family. The four-digit specification number, such as 0045, identifies the equipment-specific configuration.
For replacement-engine purchases, match the complete specification whenever possible. Selecting an engine simply because it is a "25 HP Kohler Command PRO" or has a 1-1/8-inch shaft can result in installation problems.
Before Ordering CH740-0045 or CH740-3117
- Locate the complete model and specification number on the existing engine.
- Record the Exmark mower model and serial number.
- Verify the 1-1/8-inch PTO shaft diameter.
- Verify the approximately 2.79-inch PTO shaft length.
- Confirm the 1/4-inch keyway and 7/16-20 tapped end.
- Confirm electrical and charging-system connections.
- Confirm throttle, choke and wiring configuration.
- Confirm the exhaust/muffler components required for the mower.
Need help identifying the correct Exmark engine?
Call Carroll Stream Motor Company at 1-888-208-2088 with your Exmark mower model, serial number and the complete Kohler engine specification.
Freight Shipping: This engine ships by freight. Contact Carroll Stream for current commercial, terminal or residential delivery requirements.
Payment: Payment is accepted by bank transfer, ACH or check. Credit-card purchases are subject to the applicable processing fee.
Related Kohler Command PRO Engines
Kohler CH740-0045 FAQs
What is the Kohler CH740-0045?
The Kohler Command Pro CH740-0045 is a 25 HP, 725cc, horizontal-shaft V-Twin engine configured for select Exmark Lazer Z commercial zero-turn mowers.
Is CH740-0045 an Exmark engine?
Yes. CH740-0045 is an Exmark-specific Kohler Command PRO engine configuration documented for Lazer Z applications.
What engine replaces Kohler CH740-0045?
Carroll Stream currently identifies CH740-3117 as the replacement/superseding engine for CH740-0045. Verify the mower and original engine specification before ordering.
What does CH740-0045 replace?
Kohler CH740-0045 replaced the earlier CH740-0007 Exmark engine specification.
How much horsepower does the CH740-0045 have?
The CH740 engine family is currently rated at 25 gross horsepower at 3,600 RPM.
What is the displacement of the CH740-0045?
The CH740 has a displacement of 725cc, or approximately 44.2 cubic inches.
How much torque does the CH740 produce?
The CH740 is rated at approximately 39.2 ft-lb of peak torque at 3,000 RPM.
What size shaft does the CH740-0045 have?
CH740-0045 uses a 1-1/8-inch diameter keyed horizontal PTO shaft approximately 2.79 inches long with a 1/4-inch keyway.
What thread size is in the CH740-0045 crankshaft?
The PTO shaft is drilled and tapped 7/16-20.
Does CH740-0045 have electric start?
Yes. CH740-0045 uses a 12-volt electric starting system.
What charging system does CH740-0045 use?
Published exact-spec references identify the CH740-0045 with a 15-amp alternator.
What fuel should I use in a Kohler CH740?
Kohler specifies clean, fresh unleaded gasoline rated at 87 octane (R+M)/2 or higher, or 90 RON minimum.
Does CH740-0045 include a fuel tank?
No. The engine connects to the mower's existing fuel system.
Does CH740-0045 include a muffler?
Published references for CH740-0045 differ regarding the current packaged exhaust configuration. Contact Carroll Stream to confirm whether the engine currently being sold includes the muffler required for your application.
Can I replace CH740-0045 with any CH740 engine?
No. Different CH740 specification numbers can use different PTO shafts, wiring, charging systems, controls, air-cleaner and exhaust configurations. The complete specification should be matched.
How do I know if CH740-0045 or CH740-3117 fits my Exmark?
Compare the complete Kohler engine specification with the original engine and provide the Exmark mower model and serial number. Contact Carroll Stream for fitment assistance if the numbers do not clearly match.
