Pulsafeeder Pulsa GLM DM1-6 - Manual (Page 18)

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4.5 Pump Head Removal
The PULSA GLM® includes a Pump Head that clamps the diaphragm to the Reagent Head. In the event
of diaphragm failure process fluid can come into contact with this part (it includes a drain hole to prevent
fluid accumulation). Over time, it is possible for this part to suffer some level of deterioration and need
replacement.
1. Disconnect and Lockout the power supply to the drive motor.
2. Relieve all pressure from the piping system.
3. Take all precautions necessary to prevent contamination to the environment and personnel exposure to
hazardous materials.
4. Close the inlet and outlet shutoff valves.
5. Remove the Valving, Reagent Head and Diaphragm as described in section 4.2.1.
6. Drain the oil from the pump.
7. Set the pump stroke setting to 100%.
8. Rotate the pump motor until the Cross Head (the part that the Diaphragm threads onto) is fully retracted
into the Gear Box.
9. Evenly loosen all (4) bolts that retain the Pump Head to the Gear Box.
Figure 17: Pump Head
Retaining Bolt Removal
10. Remove old pump head from front of Gear Box.
a.
b. Figure 18, Pump Head Cross Section and Bellows Seal
11. Orient replacement Pump Head with drain hole pointed down. Assure o-ring is in place on Gearbox side.
12. Ensure the bellows oil seal is seated on the end of the cross head as shown above.
13. Insert Spring Guide of Pump Head over Cross Head and into spring. Take care to assure spring does not
catch on tapered guide during installation.
14. Install the four retaining bolts. Tighten evenly. Torque to 6.75N-M (60IN-LBF).
15. Install Diaphragm, Reagent Head and Valving as defined in Section 4.2.1.
Warning – Stored energy
release possible - use caution!
The pump head compresses a
large spring that is used to
return the diaphragm to its
retracted position. Special tools
may be required to reattach the
pump head.