Viking Pump TSM285: Classic+ Lobe Pump - Manual (Page 25)

SECTION TSM 285 ISSUE A PAGE 25 OF 36
5.0 CLASSIC+ MECHANICAL SEAL
REMOVAL & REPLACEMENT
5.1 GENERAL PROCEDURES fOR
INSTALLING MECHANICAL
SEALS
“Quick summary” of mechanical seal installation
- Mechanical seals are precision-engineered assemblies
incorporating finely lapped seal faces and seats. They must
be handled with care and will not give optimum performance
unless installed carefully and according to instructions.
- When mechanical seals are to be reused, ensure seal
components are kept in their appropriate sets. Do not mix
old and new seal faces on the same seal.
- Remove any sharp corners and burrs that may damage any
elastomers such as O-rings or lipseals.
- Be sure that all seal component fitting bores and housings
are thoroughly cleaned before installation.
- The seal faces and seats must be handled with care and
cleaned thoroughly before installation.
- Be sure that seal faces are undamaged and the O-rings are
not cut, swollen or cracked.
- All O-rings should be lightly lubricated with a suitable
lubricant (silicon grease, soap etc.) before installation but
ensure there is no excessive amount of lubricant especially
around the seal face area.
- Ensure when installing seals with brittle faces and seats
such as silicon carbide that extra care is taken.
- Do not use any excessive force to install a mechanical
seal. If it is difficult to position and assemble the seal then
something is wrong.
- If you drop or damage a seal, do not install it before an
inspection has been carried out.
- Do not run a mechanical seal dry.
5.2 CP10, CP20, CP30 AND CP40
MECHANICAL SEALS
5.2.1 CP10, CP20, CP30 AND CP40
SINGLE MECHANICAL SEAL
REMOVAL
- Remove head (1.01), rotor retainers (2.02), O-rings (2.04)
and casing (3.01), refer to section 4.1.2.1 (CP10, CP20 and
CP30) or section 4.2.2.1 (CP40).
- Loosen but do not remove screws in rotary cartridge assembly
(7.05) which secure rotary seal cartridges to shafts (5.01 and
5.02).
- Remove rotary seal cartridges (7.05) with O-ring (7.02) from
shafts (5.01 and 5.02).
- Remove stationary seal seats (7.04) and O-rings (7.01) from
casing (3.01).
5.2.2 CP10, CP20, CP30 AND CP40
SINGLE MECHANICAL SEAL
REPLACEMENT
Refer to Figure 50 for CP10, CP20, CP30 and CP40
- Install O-rings (7.01) to stationary seal seat (7.04).
- Install stationary seal seats (7.04) to casing (3.01) ensuring
correct location of O-rings (7.01).
Note: On CP10 models the stationary seal
seat (7.04) has a location recess which fits
over the anti-rotation washer (7.13).
Note: On CP20, CP30 and CP40 models the
stationary seal seat (7.04) has a triangular
shape, which must locate fully into the casing
(3.01) bore.
- Install rotary seal cartridges (7.05) with O-ring (7.02) to
shafts (5.01 and 5.02) positioning to correct setting distance,
see Figure 50 and tighten screws (7.05) to correct torque,
refer to section 8.2.
- Install casing (3.01), O-rings (2.04), rotors (2.01), O-rings
(2.03), rotor retainers (2.02) and head (1.01), refer to sections
4.1.4 (CP10, CP20 and CP30) or 4.2.5 (CP40).
figure 49
Single Un-flushed Mechanical Seal
Pump Model X (mm) X (inches)
CP10 14.3 0.5630
CP20 10.8 0.4252
CP30 13.4 0.5276
CP40 17.5 0.6890
figure 50
Setting Distance for Seals
WARNING
WARNING
WARNING