REASSEMBLY
NA Series Operating & Instruction Manual
Page 26
Support and rotor disassembling
1.
Unscrew the impeller nut
2.
Remove the impeller
3.
Remove the key
For lifting instructions, please refer to GENERAL Transport section .
Gland packing inspection
1.
Remove from the complete support the stuffing box housing with the gland collar, the packing,
the shaft sleeve and the shaft sleeve gasket.
2.
Remove the gland collar and extract the packing, the lantern ring, if assembled, and the shaft.
Gaskets must be in good condition and shaft sleeve must not have roughness.
Mechanical seal inspection
Pump with integral mechanical seat site in stuffing box housing:
1.
Remove shaft sleeve complete with stop ring and the rotating part of mechanical seal.
2.
Disassembly from the complete support the stuffing box housing complete with stationary ring
of the mechanical seal.
Pump with integral mechanical seat site in mechanical seal cover:
1.
Disassembly from the complete support the stuffing box housing complete with sleeve,
mechanical seal, cover and gasket.
2.
Unscrew stub nuts from the mechanical seal cover and remove it.
3.
Extract the shaft sleeve with the mechanical seal and the gaskets.
4.
Find the exact position of the mechanical seal rotating ring before parting it from its sleeve.
Surfaces in contact to the mechanical seal must be integral and smooth and the gaskets must be in
good condition, while shaft sleeve must be perfectly smooth particularly in contact point with the
gasket.
Bearings inspection
1.
After removing the stuffing box housing as described above, remove the bearing cover pump
side and drive side, if installed.
2.
Remove the key.
3.
Withdraw the shaft complete with bearings by slightly forcing on motor side.
4.
Remove the two bearings.
