SP Pump Diagnostics and Repair
B-16
Part 1128350_02
E 2020 Nordson Corporation
Remove the Piston Cups (All Pumps)
1. While holding the piston in-place by its wrench flats, remove the M6
torque nut.
2. Remove the two piston cups and the piston seal washers.
Check/Repair
Piston cup, P/N 163039
Piston cup for high
output pump, P/N
1044068
Piston cup for low
pressure pumps,
P/N 1065445
Not torn or deteriorated, pliable
Special Reassembly Instructions
S To prevent damage to the upper piston cup when reinstalling the cylinder,
install only the bottom seal washer, the bottom piston cup, center seal
washer, and the M6 nut.
S Slide the cylinder over these components.
S Remove the M6 nut.
S Install the top piston cup and top seal washer.
S Reinstall and tighten the M6 nut.
Remove the Siphon Check Valve Assembly and Hydraulic Piston
Assembly (All Pumps)
CAUTION! Handle the piston with care. Damaging the surface of the piston
or bending the piston can cause pump leakage and/or failure.
1. Wrap shop rags or other cushioning material around the lower section of
the pump body to protect it from damage and clamp it securely in a vise.
2. Heat the siphon seat, the lower part of the pump body, and the upper part
of the pump body to ensure that the adhesive within is melte d.
3. Unscrew the siphon seat.
4. Remove the siphon seat, cage, and ball.
5. Push the piston assembly out of the bottom of the pump body.
Check/Repair
Inspect piston assembly for damage. Inspect siphon check valve parts for
damage or deposits.
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