5.1 ASSEMBLY A
The Assembly A is a wear part and will require replacement. We recommend replacement at
least every 6 to 12 months depending on use of pump, for optimal pump performance. If your
pump is shifting erratically or stalling, replace Assembly A immediately.
The following instructions will guide you through the disassembly and reassembly of Assembly
A. An annotated, exploded view of Assembly A can be seen on the following page in Diagrams
A1-A4. To begin disassembly and reassembly of Assembly A, you will need the following
tools:
. (2) Flat Head Screw Driver (1/4'' to 3/8'' head)
. (1) Assembly A installation tool (ships with spare Assembly A)
1. Insert two flat head screwdrivers drivers into the air valve actuator slots and turn
counterclockwise to loosen air valve caps.
2. Remove all pieces of Assembly A. Use Diagram A1 for reference.
3. Before reassembling a new Assembly A, apply small amounts of food grade lubricant on
ONLY the four O-rings of the air valve cylinder.
4. Line up the air valve cylinder notch with the notch on the center block. Refer to Diagram A2
for this alignment. Make sure the air valve cylinder is well aligned.
5. Next, press the air valve cylinder into the center block using the supplied installation tool.
Refer to Diagram A2. Ensure the air valve cylinder is correctly recessed by 0.2'' from both faces
of the center block, as shown in Diagram A3.
6. Reassemble Assembly A, using Diagram A4 as a reference, and tighten the air valve actuator
and air valve insert pieces with two flat head screwdriver drivers. Make sure that the air valve
caps are flush with the outer surfaces of the center block.
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