Product Overview

The YANMAR Timer HCO1-08 (Part No. 128300-77920) is a precision-engineered electronic control unit responsible for managing the pre-heating cycle of diesel engines. This "Smart Timer" ensures that glow plugs receive power for the optimal duration based on engine requirements, preventing plug burnout while guaranteeing a smooth start in cold climates.

As a vital part of the electrical system, this genuine Yanmar component offers superior resistance to vibration, moisture, and thermal stress compared to aftermarket alternatives.

Interchangeability & OEM Cross-Reference

This timer is a widely used "universal" component within the Yanmar ecosystem and is frequently rebranded or cross-referenced by major machinery manufacturers. It is interchangeable with or replaces the following:

• YANMAR: 128300-77920, 12830077920, 121450-77920, 12145077920

• DENSO: 128300-7792 (Original manufacturer for Yanmar)

• KOMATSU: YM128300-77920

• JOHN DEERE: AM876412, M802471 (Used in Yanmar-powered Gator and Tractor series)

• KOHLER: 25 755 33-S (For Kohler Diesel engines utilising Yanmar blocks)

• THERMO KING: 44-9111, 41-2189 (Used in refrigeration units)

Wide Application Range

The HCO1-08 12-Volt Timer is compatible with a vast range of Yanmar TNE, TNV, and GM/JH series engines. It is the standard pre-heat controller for many world-leading equipment brands.

Compatible Engine Models:

• 2-Series: 2TNE68, 2TNV70

• 3-Series: 3TNE68, 3TNE74, 3TNE78, 3TNE82, 3TNE84, 3TNE88

• 4-Series: 4TNE84, 4TNE88, 4TNE94, 4TNE98

• Marine: 1GM10, 2GM20, 3GM30, 3HM35, 2YM15, 3YM20, 3YM30

Common Equipment Trademarks & Applications:

• Mini-Excavators: Komatsu (PC05, PC07, PC10, PC12, PC15), Takeuchi, Hitachi, and Yanmar ViO series.

• Compact Tractors: John Deere (2210, 4010, 4110, 4115), Yanmar F-Series, and Cub Cadet.

• Industrial/Construction: Ammann Rollers, Kramer Loaders, and Neuson dumpers.

• Refrigeration: Carrier Transicold and Thermo King units (TriPac APU).

Technical Specifications

• Type: Glow Plug Controller / Pre-Heat Timer

• Model Code: HCO1-08

• System Voltage: 12V DC

• Manufacturer: Denso for Yanmar Co., Ltd.

• Origin: Made in Japan

• Availability: In stock at our Berlin warehouse (Immediate EU shipping).