Complete actuator disassembly is seldom required. Refer to the Troubleshooting Chart and
Service Procedures first.
Disassemble actuator as follows (see Figure 6):
Disconnect electrical power to controller.
Remove actuator from pump as previously explained.
Factory calibration has established relative position of limit switch plate (284-A) and potentiometer shaft (406-A).
Be sure to make legible alignment marks for the limit switch plate to permit reassembly in the
same relative position. Limit switches should be removed without disturbing plate positions if
Loosen all pulley setscrewsto facilitate access.
Pull motor pulley (410-A), remove motor mounting nuts, remove motor (411-A), remove transfer pulley (410-A),
pull transfer shaft (268-A), remove potentiometer pulley (410-A), and remove potentiometer (406-A) by loosening
the 1/2" panel nut.
Mark and remove capacitor leads and the sheet metal bracket (204-A) that isolates the terminal block (456-B &
C) from the mainframe.
Transfer shaft bushings are removed by prying off the retaining rings and pushing out the bearings. This
procedure is not normally required.
Follow the disassembly procedure in reverse order to reassemble the actuator mechanism. Use the alignment marks to
ensure correct positioning of the limit switch mounting plates and potentiometer shaft.
Before tightening pulley setscrews, attach the mechanical coupling to the control spool and move the control spool out
until the zero percent limit switch actuates. Tighten all pulley setscrews except the indicator pulley setscrews. Set
potentiometer resistance across terminals 4 and 5 to less than 10 ohms by manually turning the potentiometer shaft, then
lock the indicator pulley setscrew.
Re-adjust the indicator (298-A & 253-B) by loosening the locking screw (405-E) and rotating the pointer in the proper