Sun Pumps AP-SDS - Manual (Page 4)

12. Lightly coat the two 10-32 X 2" motor adapter screws (Item 10) with RTV silicon
and then insert them into the motor adapter holes. Rotate the motor adaptor slowly until
screws "drop" into place. Tighten the screws while alternating between the two, to 45
inch lbs. of torque.
13. Lay the discharge head (Item 4) top side down on a flat surface and install the suction
screen (Item 5) with the welded seam placed between the two cable guard screw holes.
14. Install the check valve O-ring (Item 6) and check valve (Item 7) into the discharge
head. (Make sure check valve assembly is flush with discharge head.) Turn the discharge
head over and insert the four washers (Items 3) and the 10-32 X 1 1/2" stainless screws
(Items 2) and in the 4 countersunk holes. Before inserting the screws apply a small
amount of anti-size compound to the threads.
15. Install the two relief valves (Items 8) into the two springs (Items 9) until seated. With
the motor and motor adapter still on the assembly board insert the two relief valve spring
assemblies over the small studs on the diaphragm with the relief valves pointing up.
16. With the motor assembly still held in a vertical position install the discharge head on
the motor adapter while carefully guiding the relief valves into the holes in the check
valve assembly. Make sure the relief valve springs stay on the small studs and the relief
valve is seated in the check valve assembly.
17. While holding the discharge head in position tighten the four screws a little at a time,
jumping to opposite sides, to 45 inch lbs. of torque.
18. Set the pump with the discharge end facing down on a flat table.
19. Install the two O-rings (Item 18) onto the motor adapter and lightly lubricate with a
non out-gassing food grade grease or petroleum jelly.
20. Lightly grease the inside of both ends of the stainless housing about one inch deep
and slip it over the pump assembly, with the longer inside bore down, until it rests on the
O-rings. With a small block of wood or other soft flat object push the housing down over
the O-rings until it touches the lip on the motor adapter.
21. Screw a 10-32 X 3" stud (Not Provided) into one of the coupling nuts on the back side
of the motor. This is used as a guide when installing the end cap assembly.
22. Install the two O-rings on the end cap assembly (Item 17) and lightly lubricate the O-
rings.
23. Connect the motor leads onto the electrical studs on the inside of the end cap. (Make
sure the positive red wire lead connects to the red wire side and the black to the black
wire side.) Before seating end cap in housing, be sure that the terminals on the wires are
tight on the end cap electrical studs. Slide the end cap over the guide stud, making sure
that the motor lead wires are not pinched between the end cap coupling nuts. Make sure
the cable guard screw holes are on the same side as the screw holes in the discharge head.