Removal:
a) Remove end cover (see section 6.01),
rotors (see 6.02), rotorcase (see 6.04).
b) Position rotorcase (51) face down on a
clean smooth surface, seal housings (89 or
95) uppermost. Taking care not to damage
the front of the rotorcase.
c) If double seals are fitted remove static
seal seats (92) from the housings (95),
keeping mating seal faces together. You
may wish to label the components. (See
section 6.05).
d) Loosen screws (85) by half a turn and
rotate excentric clamp plate (84) by half a
turn. Carefully withdraw the seal housings.
Note the position of drive plates, wave
springs and backing rings.
e) Inspect components for wear, replace as
required.
Re-fitting:
For single flushed seal housings refer to
section 6.05 for lip seal replacement.
a) Single or Single Flushed Seal -
Assemble wave spring (82) followed by
drive plate (81). Ensure that the 3 slots on
the outer edge of the drive plate locate on
the 3 pins in the housing. Drive plate should
be assembled with drive 'dog' side last.
a) Double Seal -Assemble one drive plate
(94) with drive 'dog' side entering first and
the 3 slots on the outer edge locating on the
3 pins in the housing. Assemble wave spring
(82) followed by the second drive plate (81).
Ensure that the 3 slots on the outer edge of
the drive plate locate on the 3 pins in the
housing. Drive plate should be assembled
with drive 'dog' side last ie opposing
direction to first drive plate.
b) For flushed or double seals, position
O-ring (91) on to the step on the outside
diameter of the seal housing.
c) Holding seal housing (86), drive plate(s)
(81 & 94) and wave spring (82), together;
position housing assembly into bore on back
of rotorcase to fit flat with rear face of
rotorcase.
d) Hold in position and rotate clamp plates
(84) half a turn in order to retain the housing.
Tighten screws (85) finger tight only
e) Ensure drive plate(s) is free to move.
Tighten housing screws to correct torque.
6.07 SINGLE O-RING SEAL
(Hy~Line Option only)
This seal is designed such that it can be
maintained without removing the rotor case.
It will be neccesary to remove the end cover
to gain access to the seals.
Removal :
a) Remove the rotor retaining screws (59),
being careful not to lose the O-rings (58).
Withdraw the rotors from their shafts. The
rotor has a small sleeve (96) inserted into
the rear face, this should come out together
with the rotor. If it does not then it will be
necessary to remove this sleeve from the
rear of the rotor case.
b) Remove the sleeve from the rotor and the
O-ring (99) from the groove in the sleeve.
c) To replace the dynamic O-ring (100)
simply pull it out from the bore in the rear of
the rotor case.
Page 29
Hy~Line and Ultima Lobe Pumps
07/03
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