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P5510
Users Manual
8
2. Remove 4 screws from sides of the housing (2 each side), and lift out cover plate
from underside.
3. Disconnect nylon tubing from check valves (23) and (19).
4. Loosen locknut (3) approximately 1 turn.
5. Remove spring clip (1) from clevis (2), and swing the pump handle out of the way.
6. Unscrew clevis from piston shaft.
7. Loosen set screws (4) approximately 1 turn, and unscrew pump lock (5).
8. Pump assembly can be withdrawn from the instrument housing.
Pump Disassembly
1. Disassemble outlet check valve assembly, by unscrewing valve body (19). Take care
not to loose the small internal items that may spring out.
2. Disassemble inlet check valve assembly. If there is any doubt about the functionality
of the in-line check valve (23) it should be replaced, as it is difficult to clean
effectively.
3. Remove guide (6) from cylinder (13) — take care not to damage this, as it is a tight
fit within the cylinder.
4. Remove piston assembly from cylinder (13).
5. The piston head assembly (12) can be separated from the piston shaft (10) by
removing the snap ring (9).
Cleaning & Inspection
Note
The piston head assembly cannot be further disassembled without damage
to the components, so it must be wiped clean with a soft cloth to remove any
contamination.
Check all seals for signs of wear and/or damage.
Check the cylinder bore for signs of excessive wear, scratches/scoring, etc.
Replacement seals are available; however, if there is significant damage to the internal
components, the pump is available as a replacement assembly.
Pump Reassembly
1. Reassembly is the reverse of the above disassembly instructions.
2. Care should be taken whenever a seal comes in contact with metal components, to
avoid damage to the seal from sharp edges, etc.
Examples:
• When introducing the piston head assembly (12) into the cylinder (13).
• When introducing the piston shaft (10) through the central hole in the guide (6).
• When introducing the guide (6) into the cylinder (13).
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