Inspection of the actuator is recommended at three-month intervals. Remove the screws in the rear of the housing cover
(281-A) and slide the cover forward and off.
Visually inspect the mechanism for signs of wear, parts misalignment, loose-fitting components, or other problems.
Maintain as necessary.
service can be performed without removal of actuator from pump as long as the unit is
accessible. Refer to the Service Procedures section before removing the actuator.
Removal of actuator from pump (see Figure 6):
Remove the two screws (405-C) and the actuator housing cover (281-A).
The pump end of the actuator coupling device should be accessible. If not, energize the actuator toward zero
percent capacity until the E-ring (404) on B-frame units or setscrew (256) on A-frame units is accessible. Pry the
E-ring from the control spool (268-B) groove or back out the setscrew as required to permit removal of the pump
control spool from the actuator coupling.
Remove the actuator mounting nut located on the lower front plate of the actuator. The actuator can now be
removed from the pump. Save the special sealing washer (408-A); do not remove the upper sealing washer and
bolt (this is a hole seal only).
Do not move the control spool during disassembly or assembly, as additional motion past zero percent can
damage the internal-pump seals.
To reassemble actuator onto pump, follow the previously outlined steps in reverse order. Make sure drive belt and
potentiometer are both at zero position during reinstallation (see Potentiometer Replacement for details).