Primary Seals - Packo HP Series Instruction Manual

Figure 18 - Loosen the rotor bolt (bottom rotor)
• Use only the special tool (181) supplied to
loosen and retighten. Both screws have a
right-hand thread.
• Withdraw the rotors carefully to avoid seal
damage by contact between the shaft
ends and seals faces which are located on
the back of the rotors.
• Make note of which shaft the rotor fits to,
so that you can fit the rotor back onto the
correct shaft.
matched seal faces)
• Note: When removing the rotors the static
seals can, on occasion, be pulled out of
their seal bores. This does not damage
the seal but extra care must be taken not
to drop the static seal face.
Re-fitting:
• With the seal and cup rubber correctly
fitted within the back of the rotor (see 6.3
PRIMARY SEALS) clean and dry the seal
faces with a soft tissue before re-fitting.
Do not lubricate the seal faces.
• Slide the rotor assemblies onto their
respective shafts. When fitting each rotor
it should slide freely on its drive splines.
(HP32 & 34 scimitar rotors locate on flats)
• Lock the rotors using a soft spacer (Figure
19) - a plastic block (180) is provided with
the pump for this purpose.
Figure 19 - Tighten the rotor bolt (bottom rotor)
• Lubricate the O-ring (58) and fit into the rotor
bore in the front of the rotor and refit the
screw.
• Retighten using the special tool provided to
the torque specified in Table 4 - Rotor torque.
Retighten using the special tool provided to the
torque specified in Table 4.
Pump Size
HP 32/34 Rotor Screw
HP 42/44 Rotor Screw
(preventing mixing
Fixings Torque
18Nm
55Nm
HP 52/54
HP 62/64
LH 72/74/76
(tri-bolt)
Table 4 - Rotor torque

6.3 PRIMARY SEALS

When the rotors have been removed (see 6.2
ROTORS) the primary seals can be inspected for
wear, cracks, chips, scratches or signs of burning
of
caused by running dry.
Inspect rubber joints for damage or deterioration.
Clean the seal faces with soft lint-free tissue
before re-assembly.
It is advisable to purchase and fit new elastomer
trim kits from your local distributor, when
removing and
precaution it is also advisable to have a spare set
of seal faces available as these parts are very
brittle and are easily broken.
To dismantle mechanical seals:
ATTENTION
Ensure that you DO NOT scratch any components
of the pump, as this will compromise the
cleanability of the pump.
HP 4-6
• Carefully remove the static seal seats (80)
from their bores in the rotor case (51), This is
done by using the special seal removal tool
(182) supplied with the pump. Carefully insert
the seal removal tool between the outside
diameter of the static seal seat and the bore
in the rotor case. (Figure 20)
Figure 20- Seal seat removal
Rotor Screw 55Nm
Rotor Screw 100Nm
Hygienic Cap 40Nm
Bolts 50Nm
re-fitting seal faces. As a
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