Diaphragm Repair on a Udor KAPPA 43 Diaphragm Pump

The Diaphragm Kit consists of 3 diaphragms and 3 sets of 2 O-rings/each. For this repair you will need:

• A wrench
• A screwdriver
• ½” socket
• 11/16” socket

1. Loosen the bolts on one of the 3 head assemblies
2. Remove the head assembly
3. Remove the diaphragm, nut, and washer
4. Remove the diaphragm
5. Remove the sleeve, and drain the internal oil
6. Loosen the bolts on the 2^nd head assembly
7. Remove the head assembly
8. Remove the diaphragm, nut, and washer
9. Remove the diaphragm
10. Remove the diaphragm sleeve
11. Repeat this process on the remaining head
12. Clean the inside of the pump with carb or brake cleaner
13. Replace the sleeve, lining up the holes on the sleeve with the holes on the piston
14. The diaphragm has a beveled side; this side will be pointing out
15. Replace the diaphragm, nut, and washer; tighten with a wrench
16. On each side of the 3 outer head assemblies remove the inside of the valve cage, replace the spring, small seat (beveled side down), and large metal seat
17. Place the valve assembly back onto the head and replace the O-ring with a new one
18. The other side has the same pieces in the opposite order
19. Replace the spring, seat, and large seat
20. Replace the O-ring with a new one
21. Repeat this process on all 3 head assemblies
22. Replace the head assembly
23. Tighten the assembly skipping bolts in a clockwise pattern to evenly tighten
24. Replace the piston sleeve on the 2^nd side
25. Replace the diaphragm with the beveled side out
26. Replace the diaphragm, washer, and nut; tighten with a wrench
27. Replace the 2^nd head assembly, tightening the bolts with a wrench
28. Using non-detergent 40W pump oil; fill the open side of the pump to the brim
29. Replace the final piston sleeve, lining up the holes with the piston
30. Clean off excess oil  Replace the final diaphragm
31. Replace the diaphragm, washer, and nut; tighten with a wrench
32. Replace the final head