Kohler 26.1 HP (19.5 kW) KDW1003 Diesel Engine | 3-Cylinder Water-Cooled Power Unit, supplied complete with radiator and fan, mounting feet, air filter, muffler, start panel with auto shutdown on low oil or high temperature.

Professional Overview

The Kohler KDW1003 is a premium, European-manufactured 3-cylinder liquid-cooled diesel engine designed for high-performance industrial applications. This High Speed Open Power Unit delivers up to 19.5 kW (26.1 HP) at 3600 RPM, providing a robust and reliable power source for excavators, generators, and high-pressure hydraulic systems.

Engineered for longevity and quiet operation, the KDW1003 features an overhead camshaft and indirect fuel injection via unit injectors.
The cast iron crankcase with re-borable cylinders ensures this unit is built for a long service life in demanding Australian conditions.

Current Stock Status: Limited quantities are back in stock. Save $523 off the List Price.
Due to high demand, please contact us on 07 5571 6155 to confirm immediate availability or to secure your unit via pre-order.

Technical Specifications

• Model: Kohler KDW1003 (High Speed Open Power Unit)
• Configuration: 4-Stroke Diesel, In-Line 3-Cylinder
• Displacement: 1028 cc
• Bore/Stroke: 75 mm / 77.6 mm
• Power Output (N ISO 1585): 19.5 kW / 26.1 HP @ 3600 RPM
• Maximum Torque: 64 Nm @ 2000 RPM
• Cooling System: Liquid-cooled with axial suction fan and mounted top tank radiator
• Lubrication: Full-pressure lubrication with full-flow oil filter
• Water Pump Delivery: 50 Lt/min
• Combustion Air Flow: 1850 Lt/min @ 3600 RPM
• Dry Weight: 120 kg
• Rotation: Counter-clockwise (viewed from PTO side)

Standard Features & Inclusions

This "Open Power Unit" is supplied as a comprehensive package, ready for integration:

• Integrated Cooling: Mounted top tank radiator, suction fan, and radiator fan guard.
• Filtration & Exhaust: Mounted air cleaner, fuel filter with valve, and muffler with integrated guard.
• Electrical System: 12 V electric starter and 45 Amp external alternator.
• Control & Safety: Mounted control panel featuring a safety shutdown system for low oil pressure and high coolant temperature.
• Mounting: Heavy-duty mounting feet included.
• Drive Interface: Group 8 interchange housing with SAE 5, 6.5” flywheel.

Customisation & Hydraulic Integration

At Hydraulic.online, we specialise in matching diesel power to hydraulic performance.
We offer a range of accessories to suit your specific drive requirements:

• SAE Housings & Drives: Custom configurations available.
• Shaft Extensions: Standard sizes including 1-1/8” and 1-5/8”.
• Hydraulic Pump Mounting: Contact our technicians to discuss pump displacements and mounting flange requirements.

Technician’s Advice

When installing the Kohler KDW1003 in a hydraulic circuit, ensuring correct alignment and radial load management is critical for crankshaft longevity.
The maximum allowable axial load for this unit is 300 kg.
If you are utilising a belt drive system, always adhere to the minimum pulley diameters: for a V-belt, ensure


We strongly recommend the use of the integrated safety shutdown system.
High-pressure hydraulic applications can place significant thermal loads on the engine;
The auto-shutdown for high coolant temperature is your primary insurance against catastrophic engine failure.
Always use high-quality coolant and maintain the axial fan's integrity to ensure the 50 Lt/min water pump delivery remains effective under load.

MM 18/03/2026 $ abc.