AERCO ECS Retrofit - Manual (Page 14)

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2.5.2 Electro-Hydraulic Control Valve Actuator Removal
Refer to Figure 2-5 and remove the Control Valve Actuator as follows:
1. Disconnect the electrical connectors from the Actuator.
2. Loosen the Upper Hex Nut above the Lower Crossbar shown in Figure 2-5.
3. While holding the Lower Shaft with a pair of pliers, completely remove the Upper Hex Nut.
4. Remove the four hex head bolts securing the Electro-Hydraulic Actuator to the Valve Top.
5. Lift the entire Actuator off the Valve Top. Also, remove the Actuator Gasket.