Woodward|8235-639|Engine Control Module
Woodward TQ-125™ Engine Control Module (8235-639)
Description
The Woodward TQ-125™ (P/N 8235-639) is a mechanical-hydraulic speed control module designed for diesel or gaseous engines providing precise speed regulation via a lever-arm linkage system.
Features
- Mechanical-hydraulic operation for robust performance
- Compatible with MPU (magnetic pickup) or ignition coil speed signals
- Linear (diesel) or non-linear (carbureted) linkage configurations
Technical Specifications
- Input Voltage: 12–24 VDC (protected by 6A fuse)
-
Speed Signal Input
- MPU (pins 3/4) or ignition coil (–) (pin 6 for 8405-214 variant)
- MPU teeth or cylinder count configurable
- Operating Temperature: –40°C to +105°C (–40°F to +221°F)
-
Linkage Requirements
- Minimum 30° travel for stability; 60° full range
- Return spring torque ≤0.07 N·m (0.05 lb-ft) at max load
- Current Draw: 2.1A average (25W max at 12V)
- Mounting: Rigid bracket attachment with 0.250-28 screws
Woodward|8235-639|Engine Control Module



Woodward|8235-639|Engine Control Module
Woodward TQ-125™ Engine Control Module (8235-639)
Description
The Woodward TQ-125™ (P/N 8235-639) is a mechanical-hydraulic speed control module designed for diesel or gaseous engines providing precise speed regulation via a lever-arm linkage system.
Features
- Mechanical-hydraulic operation for robust performance
- Compatible with MPU (magnetic pickup) or ignition coil speed signals
- Linear (diesel) or non-linear (carbureted) linkage configurations
Technical Specifications
- Input Voltage: 12–24 VDC (protected by 6A fuse)
-
Speed Signal Input
- MPU (pins 3/4) or ignition coil (–) (pin 6 for 8405-214 variant)
- MPU teeth or cylinder count configurable
- Operating Temperature: –40°C to +105°C (–40°F to +221°F)
-
Linkage Requirements
- Minimum 30° travel for stability; 60° full range
- Return spring torque ≤0.07 N·m (0.05 lb-ft) at max load
- Current Draw: 2.1A average (25W max at 12V)
- Mounting: Rigid bracket attachment with 0.250-28 screws