Magnum Venus Plastech Pro Series 11:1 PRO PUMP VPRO-45110 - Manual (Page 16)

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Remove Piston Body Assembly:
1. Remove the piston body (15939-1).
CAUTION: Hold your hand under the pump as you loosen the piston body to prevent
the ball (ALS-1018) and piston ball spring (3102-8-1) from falling out.
2. If the ball falls, it must be replaced. Inspect the ball and spring to be sure that there
is no damage.
3. Remove the spring retainer (86800-1) and lower packing spring (04305-1).
Disassemble Piston Body Assembly:
1. Separate the piston cup backup ring (VLS-4617), the two piston cups (VLS-4615),
the piston cup spacer ring (VLS-4616) and the compression ring (15936-1). Inspect
these components for wear and replace if necessary.
NOTE: The piston cups will have to be replaced during reassembly.
Assemble Piston Body Assembly:
1. Lubricate the two piston cups (VLS-4615) with Red Grease (6706-2-1).
2. Assemble the piston body components onto the piston body (15939-1) in the order
they were removed. Be sure to assemble the components with the correct sides
facing each other. See below
a. The piston cup backup ring (VLS-4617) should have its grooved side facing
up toward the pump.
b. The piston cup (VLS-4615) s hould have its “cup” facing up.
c. The piston cup spacer ring (VLS-4616) (which separates the piston cups)
should have its grooved side facing up.
d. The second piston cup (VLS-4615
) should have its “cup” facing up.
e. The compression ring (15936-1) should have its beveled side facing down
toward the bottom of the pump. Newer versions of the compression ring are
universal, both sides are the same.
Piston Cup
– VLS-4615
Piston Cup Spacer Ring – Ridges Up
Piston Cup – VLS-4615
Piston Cup Backup Ring – Ridges Up
3. Keep the ball (ALS-1018) and piston ball spring (VLS-2414) with this assembly, but
do not assemble them onto the pump yet.
NOTE: Be sure the compression ring is positioned down over the shoulder of the
piston body or the piston cups will not tighten properly.