Flowserve Gearex Rotary Gear Pumps External and Internal Bearing - Manual (Page 40)

EXTERNAL GEAREX USER INSTRUCTIONS ENGLISH 71569246 (2167B-E1)
Flowserve Pump Division 40
®
p) Install the bearing outer races, oil seals, glands
and/or seal seats in the front bracket if non
cartridge seals are used. Mount a new gasket
and install the front bracket, noting location of the
top mark. Tighten capscrews finger tight only.
Note that if the pump is fitted with split brackets
the seal housing (2B) can be mounted first, then
the seal assembly (don’t tighten drive screws at
this time) followed by the bearing half (2A).
q) Mount a new gasket (50) on the front of the
bracket (3)and install the front cover (5) complete
with lipseal (26).
r) Line up dowel pin holes in front and rear brackets
and insert dowel pins (61). Tighten all
capscrews(55). Pump should now turn freely. If
the pump does not turn freely, refer to section
6.11 Free movement.
s) Repack the stuffing boxes with new packing if so
fitted.
6.9.2
Re-assembly of external bearing pump
size E
Refer to typical sectional drawing Figure 3 in section
12.3 of this manual.
a) Inspect all new parts. Remove all nicks and burrs
which may have occurred in handling.
b) If new rotors are required, they should be installed
on the shafts now. Apply anti-seize compound to
the shafts at the rotor location. Fit the key into the
shaft keyway. Slide the rotors onto the shafts
from the end opposite the time gear location.
(There is a reduced diameter lead on section
here). Fit the rotor and shaft into a press and
push the rotor on until it aligns with the reference
marks scribed during disassembly.
c) Apply anti-seize compound to the shafts at the
location of the front inner race. Install the inner
race on the shaft. Use an induction heater or hot
oil bath to first heat the race. (90
°
C (200
°
F)
recommended).
d) Temporarily install the timing gears and keys onto
the shafts. (Spacers and locknuts, etc., are not
required.)
e) Intermesh the drive and driven shafts, taking care
to align the timing marks on the face of the timing
gears. Slide the shaft assembly into the body and
remove the timing gears and keys.
f) If rotor spacers are required, slide them onto the
shafts and up against each end of the rotors.
g) Install the thrust bearings (14 ) in the front bracket
(3).
h) Mount a new end flange gasket (50) on the front
of the body.
i) Mount the front bracket, with oil seals (27) in
place, on the body (1), noting the top mark. If
pumps are fitted with mechanical seals, the
rotating heads of the seals must be in the correct
position on the shafts prior to mounting the
brackets. If a new rotating element is being
installed in the pump, do not mount seals at this
time. Refer to section 6.10.1.1 External bearing
pump.
j) Install locknuts (20) and lockwashers (21).
k) Replace the front bracket to body capscrews (55)
and tighten finger tight only.
l) Install the bearings (15) and oil seals (27) in the
rear bracket along with glands and/or seal seats.
Mount a new gasket (50) and install the bracket
noting location of the top mark. Tighten
capscrews finger tight only.
m) Mount the timing gear spacers (17), and timing
gears (13) on the appropriate shafts.
n) Install locknuts (18) and lockwashers (19).
o) Install a gasket (50) on the rear of the bracket (2)
and install the rear cover (4).
p) Install a new oil seal (28) in the front cover (5) and
using a new gasket (50) install the cover on the
front bracket (3).
q) Line up dowel pin holes in front and rear brackets
and insert dowel pins (63). Tighten all capscrews
and nuts. Pump should now turn freely. If the
pump does not turn freely, refer to section 6.11
Free movement.
r) Repack the stuffing boxes with new packing.
6.9.3
Reassembly of internal bearing pump
a) Inspect all new parts. Remove all nicks and burrs
which may have occurred in handling.
b) If new rotors are required, they should be installed
on the shafts now. Apply anti-seize compound to
the shafts (10,11) at the location of the front
bearing inner race. Fit the key (23) into the shaft
keyway. Slide the rotors (12) onto the shafts from
the end opposite the time gear location. (There is
a reduced diameter lead on section here). Fit the
rotor and shaft into a press and push the rotor on
until it aligns with the reference marks scribed
during disassembly.
c) Apply anti-seize compound to the shafts at the
location of the front bearing inner race (15).
Install the inner race on the shaft. Use an
induction heater or hot oil bath to first heat the
race. (90
°
C (200
°
F) recommended). Press the
inner race on the shaft with the aid of a sleeve so
that it remains square to the shaft.
d) Temporarily install the timing gears (13) and keys
(22) onto the shafts. (Spacers and locknuts, etc.,
are not required.)
e) Intermesh the drive and driven shafts, taking care
to align the timing marks on the face of the timing