Kohler KT series Repair

These were the first "Twin Cylinder K-Series" engines. They are famous among collectors of vintage John Deere, Cub Cadet, and Gravely tractors.

• The "Series II" Distinction: The most critical technical detail for these engines is the lubrication. Series I engines used a splash/spray system that was prone to oil starvation on hills. The Series II introduced a full-pressure system with a spin-on filter, which fixed these reliability issues.
• Cast Iron Longevity: Like the single-cylinder K-series, these used cast-iron cylinders that can be rebored and rebuilt, making them a "forever" engine if maintained properly.

Likely encountered on most residential zero-turn mowers today. They are designed to bring commercial-style performance to the home user.

• Consistent-Cut™ Technology: This is an internal governor logic that maintains engine speed and blade tip speed even when hitting tall, thick grass, ensuring a clean cut without bogging down.
• Maintenance-Friendly Design: Kohler moved all primary service points (oil filter, drain, fuel filter) to the same side of the engine. They also utilize a top-access air cleaner that requires no tools to inspect.
• Head Gasket Note: As we've discussed before, the KT735 model in this series is specifically known for head gasket failures at higher hours; if you're diagnosing a "puff of smoke" or a loss of power, that's the primary circuit to check.