The 275 Series Electric Actuator is designed to mount directly on Bosch 'P' and 'RP 21' Fuel Injection Pumps in p-lace of the mechanical governor. When the 275 Series is installed on the fuel pump, an integral high performance fuel control system without external linkages or brackets results. An external fuel rack return lever is provided to manually override the actuator's control. Also provided is an adjustable internal maximum fuel limit for calibration.
The 275 Series, a second generation design that is more powerful than its predecessor, is able to control up to 16 cylinder pump-arrangements. The actuator was designed with two isolated chambers that eliminates the possibility of any magnetic particles collecting and jamming the actuator. The upper chamber, which contains spray-oil, houses the actuator linkage and the lower chamber houses the electro-magnetic components. The 275 Series typically outlasts the life of a diesel engine's.
GAC amp; HT has a complete line of Camshaft Bearing Retainer Kits available for the 275 series to ensure an appropriate fi t and prevent leakage. The 275 Actuator can also be installed on Bosch 'MW" and 'A' Pumps.

GAC Electric Actuator (ACE275J-12/24V)

24VDC / Bosch ‘P’ 3000-7000 Fuel Injection Pump / Packard Connector / High Torque Return Spring / Oil Drain Fitting

For the most common 275 series' variations and kits available see TABLE 1.

Description
The actuator is an electromagnetic servo device which can be integrated into a closed loop control system.
An engine control system can be described as follows.
An electrical signal is generated by a magnetic speed sensor which is proportional to engine speed.
This signal is sent into the electronic speed control unit which compares it to the preset engine speed setting.
If the magnetic speed sensor signal and the preset engine speed setting are not equal, a change in current from the
Speed control unit to the actuator will change the magnetic force in the actuator.
The rotation of the actuator shaft will then adjust the fuel to the engine and cause the engine speed to be equal to the
Preset engine speed setting.
Shaft rotation is proportional to the amount of actuator current and counterbalanced by the internal spring.
Since the design has no sliding parts and is totally sealed, outstanding reliability results.
A single compression spring is used to improve reliability.