Varisco S.p.A.
Z.I. Nord - Terza Strada, 9 - 35129 PADOVA – ITALY
Tel.+39.049.8294111 Email: [email protected]
Fax+39.049.8076762 Web: www.variscospa.com
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9.4.2 MECHANIC SEAL REPLACEMENT
9.4.2.1 SMALL-SIZED PUMPS (MOD. 010 – 015 – 020 – 022)
DISASSEMBLY
1. Remove stator and pump body following the steps outlined in Chap. 9.3.1 (p. 1 and 2)
2. Loosen the fixing grub screw (06) and remove the pump motor by extracting it in the
direction of the black arrow.
3. Move the sleeve (07) in the direction of the black arrow.
4. Unscrew the grub screw from the bush (08) in order to be able to move it along the shaft in
the direction of the black arrow.
5. Extract the long pin (09) and detach the propeller shaft by moving the whole in the direction
of the black arrow.
6. Extract the hollow shaft (10) from the pump in the opposite direction of the black arrow,
holding the seal face (11) to prevent it from damage upon the disjunction of the seal from
the hollow shaft.
7. Remove the stationary seat (12) using a screwdriver.
RE-ASSEMBLY
1. Check the condition of O’Rings, seal and stationary seat faces.
2. Check the condition of the hollow shaft.
3. Clean the hollow shaft, the housing (13) (see picture above) and all involved parts.
4. Clean and oil the propeller shaft (Rust jams the shafts coupling, thus increasing the danger
of damage during disassembly).
5. Wet with glycerine the hollow shaft (10) and the bush (08) on the involved area to ease the
insertion of the mechanic seal.
6. Carefully clean the seal faces before assembly.
7. Perform the steps backwards described in Chap. 9.5.2.1.1.
WARNING: During re-assembly, it is necessary to distribute the pressure uniformly on the fixed
ring, to prevent malfunctioning or failures.
9.4.2.2 MEDIUM AND LARGE SIZED PUMPS
DOUBLE MECHANIC SEAL
9.4.2.2.1.1 DISASSEMBLY
1. Disconnect the flow pipes at the indicated points (01) (see picture A).
2. Remove stator and pump body following the procedure in Chap. 9.3.1 (points 1 and 2).
