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4.4.5 UNIBLOC 200-450 Seal Installation – Final Step
See section 5.3 for torque limits. If not part of the shaft seal
assembly, slide the plastic mounting sleeves over the splined
ends of the shafts. Slide on the rotor housing (1) tap it with a
rubber mallet to seat it properly on the dowel pins (20). Make
sure the alignment mark on the rotor housing lines up with the
one on the bearing housing (6). The rotor housing must make
firm contact with the bearing housing. On
UNIBLOC models
300-450
, fasten the hex nuts (43) with the split washer (44) on
the stud ends and tighten in a cross pattern.
On
UNIBLOC models 200-275
, insert the one piece studs
(15) through rotor housing and thread into the bearing
housing. Tighten them in a cross pattern by locking two M6
nuts against each other on the
protruding
stud
ends.
Remove the plastic sleeves from the shaft ends. If the shaft
seals are either flushed single or flushed double mechanical,
tighten the set screws through the flush housing’s port holes.
If the rotors are made from a polymer (nonmetal) material,
slide them on the shafts and turn the drive shaft to make sure
the rotors turn freely. They do not require o-rings (26) and
(27) or the rotor bolts (14a, 14b). If the rotors are metal, slide
the rotor shaft o-rings (27) over the splined shaft ends and on
the step, if applicable.
One of the rotors will have a small marking on the rear end.
This indicates that this rotors match with the drive shaft.
Slide the rotors over the corresponding shafts and push them
making sure the o-rings seat properly. The rotors must make
contact with the shafts. Place o-rings (26) on the rotor bolts
(14a, 14b). Lubricate them and the rotor bores. Place a
nonmetal object between the rotors to keep them from
turning. Thread the rotor bolts in to the shaft ends. Turn the
drive shaft to make sure the rotors turn freely. Measure the
clearances between the rotor housing and the rotors. Compare these values with those listed in section 5.4. If the measured
clearances at positions 1-7, 8, and 10 are smaller than those listed, the rotors must be ground and polished to achieve the correct
values. If the measured clearances at positions 9 and 11 are not within the tolerances listed the shafts must be adjusted by
disassembling the bearing housing, as instructed in section 4.5 and changing the shims (11).
Place the o-ring (28) in the groove on the cover (2). Slide the cover on the studs (15). Tighten the front cover nuts (16). Check the
oil level in the bearing housing as
described in section 5.2. The pump is now ready to be installed in the system. If flushed seals
were installed, reconnect the flush tubing. Refer to section 2.3 before starting the pump.
