INOXPA HLR, Installation, Service And Maintenance Instructions

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26 7.Maintenance (A) 2021/11
7.7. MECHANICAL SEAL ASSEMBLY AND DISASSEMBLY
7.7.1. Single mechanical seal
Mechanical seals are fragile parts. Take care when handling them.
Do not use any screwdriver or similar tool to pull out the parts.
• Clean all the components of the mechanical seal before placing them.
• Check that the working surfaces are not damaged. INOXPA recommends replacing the entire mechanical seal if one of the
working surfaces has a defect.
• Replace the O-rings during assembly.
Pos. Description
Single mechanical seal
01 Rotary part
02 Stationary part
03 O-ring
04 Washer
05 Drive Ring
06 Wave Spring
07 O-ring
Disassembly
Pump size 0: Remove the shaft sleeve (13) mounted on each shaft. Sleeves are not interchangeable.
Remember the shaft each sleeve was mounted on.
Pump size 1, 2, 3, 4: Remove the shaft shims (32) mounted on each shaft. If more than one is
mounted on each shaft, keep them separate to prevent them from getting mixed up.
•
Normally the Rotary Assembly (01) remains housed in the lobe rotor during disassembly. Remove them carefully.
• Remove the stationary parts (02 + 05) from the rotor case bores along. Please proceed carefully.
Assembly
Pump size 0: Fit the sleeves (13) on each origin shaft.
Pump size 1, 2, 3, 4: Fit the shims (32) on each origin shaft.
• Lubricate all the O-rings of the mechanical seal with soapy water or oil compatible with the material of the seals, pumped
liquid and application.
• Mount the drive ring (05) into the rotor case bore, taking care to align it with the 4 seal washer located in the back of the
rotor case.
• Fit the stationary part (02) with the drive ring (05) into the rotor case bore, ensuring that the pins of the drive ring (05)
engage with the biggest slots of stationary part (02).
Note:
Pumps size 0. Be sure that shaft sleeves (13) are already assembled on the pump before mounting the
mechanical seal.
• Mount the rotary assembly (01) to the lobe rotor ensuring that the pins of the lobe rotor engage with the slots of the
rotary assembly, and it remains perfectly flat.
• Clean the working surfaces with solvent.
• Reassemble the lobe rotor according to 7.5.5 Lobe assembly .
• See paragraph
7.6.3 Lobe/Pump Rotor case adjustment using shims .