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7.4 Removal and Replacement
To replace the pump shaft seal:
Following the instructions in the previous sections, remove the reagent head assembly.
Then remove the diaphragm. Remove the pump shaft by unscrewing counter-clockwise.
Take care not to allow any shims to drop into the eccentric box when removing the shaft.
A thread-locking compound is used between the pump shaft and the crosshead
assembly. Remove the three (3) socket head screws and seal retainer plate. The seal
can now be removed. DO NOT reuse a damaged pump shaft or polish an old one too
smooth. A shaft that is too smooth will weep oil over time when running.
Reinstall by reversing the disassembly procedure. Lubricate the ID of the seal liberally
with silicone grease (ex. Parker ‘Super O-Lube’). Refill the eccentric box with Pulsalube
Oil 9M per the Lubrication Section.
Figure 19
To replace the motor adapter seal:
First remove the motor per Motor Removal and Reinstallation. Loosen the coupling
setscrew through the access hole in the motor adapter and remove the worm coupling
half. Remove the four motor adapter bolts and withdraw the motor adapter from the
gearbox. Take care not to lose the shims from between motor adapter and gearbox.
Remove the oil seal from the motor adapter. Lubricate the replacement seal with
Pulsalube 8G gear oil and install by pressing into position. Reassemble by reversing the
above disassembly procedure.
