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The Diaphragm Kit consists of 3 diaphragms and 3 sets of 2 O-rings/each.
For this repair you will need:
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- A wrench
- A screwdriver
- ½” socket
- 11/16” socket
- Loosen the bolts on one of the 3 head assemblies
- Remove the head assembly
- Remove the diaphragm, nut, and washer
- Remove the diaphragm
- Remove the sleeve, and drain the internal oil
- Loosen the bolts on the 2nd head assembly
- Remove the head assembly
- Remove the diaphragm, nut, and washer
- Remove the diaphragm
- Remove the diaphragm sleeve
- Repeat this process on the remaining head
- Clean the inside of the pump with carb or brake cleaner
- Replace the sleeve, lining up the holes on the sleeve with the holes on the piston
- The diaphragm has a beveled side; this side will be pointing out
- Replace the diaphragm, nut, and washer; tighten with a wrench
- 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
- Place the valve assembly back onto the head and replace the O-ring with a new one
- The other side has the same pieces in the opposite order
- Replace the spring, seat, and large seat
- Replace the O-ring with a new one
- Repeat this process on all 3 head assemblies
- Replace the head assembly
- Tighten the assembly skipping bolts in a clockwise pattern to evenly tighten
- Replace the piston sleeve on the 2nd side
- Replace the diaphragm with the beveled side out
- Replace the diaphragm, washer, and nut; tighten with a wrench
- Replace the 2nd head assembly, tightening the bolts with a wrench
- Using non-detergent 40W pump oil; fill the open side of the pump to the brim
- Replace the final piston sleeve, lining up the holes with the piston
- Clean off excess oil Replace the final diaphragm
- Replace the diaphragm, washer, and nut; tighten with a wrench
- Replace the final head
