Rehlko (formerly Kohler) PA-CH740-3175 25 HP Command PRO Horizontal Engine, 1-1/8" x 2-3/4" Shaft, Oil Cooler (for Exmark)

The Rehlko (formerly Kohler) PA-CH740-3175 is a 25 HP 725cc Command PRO V-twin horizontal-shaft engine with a 1-1/8" x 2-3/4" crankshaft, an integrated oil cooler and 15 amp charging. This spec is built for Exmark equipment and is the factory service-replacement engine for those machines. Factory spec: CH740 E09 EXMARK- REPLACEMENT.

Kohler Engines is now Rehlko. Same engines, same factory, same part numbers — only the name on the shroud changed. If your equipment manual or engine tag says Kohler CH740-3175 (or PA-CH740-3175), this is the engine.

Why buy the PA-CH740-3175 from RFQQQ

• Brand new, genuine Rehlko OEM engine backed by the manufacturer's engine warranty
• $200 flat-rate LTL freight to the lower 48 + DC; Expedited / Need It Fast available
• Pro accounts, net terms and POs for dealers, rental yards and landscape contractors
• Real people on the phone at (646) 666-7225 to confirm fitment before you order

Key features

• 25 HP 725cc Command PRO V-twin engine
• Horizontal crankshaft: 1-1/8" x 2-3/4"
• Integrated oil cooler for lower operating temperatures
• Electric Start, 15 Amp charging
• Oil capacity 2.0 qt (1.9 L); Rehlko/Kohler 10W-40 synthetic recommended (OCK-RKC-10440)
• Commercial-duty Command PRO design with cast-iron cylinder liners

Specifications

Fitment and replacement notes

• Factory replacement for older spec CH740-3118 (Exmark).
• Muffler, mounting hardware and OEM-specific brackets are generally not included unless noted — reuse your existing exhaust and hardware.
• Before ordering, match crankshaft diameter and length, mounting pattern, PTO/clutch, fuel and wiring connections to your current engine tag. Not sure? Call (646) 666-7225 with your engine model and spec number and we'll confirm.

Frequently asked questions

Is the PA-CH740-3175 a Kohler or a Rehlko engine?

Both. Kohler Engines rebranded to Rehlko; the design, factory and part number are unchanged. Kohler CH740-3175 and Rehlko PA-CH740-3175 are the same engine.

How much does shipping cost?

Engines ship palletized by LTL freight for a flat $200 to the lower 48 states and DC. Expedited / Need It Fast ($235.95) is available at checkout — we call you with the fastest options.

What is the crankshaft size?

1-1/8" x 2-3/4" (horizontal shaft). Always confirm against your original engine before ordering.

What does the PA-CH740-3175 replace?

It is the factory replacement for CH740-3118.

Is this a genuine OEM engine?

Yes — brand new, genuine Rehlko engine with the manufacturer's warranty.