
FF-MM-321-REV - 03
Page 11
Operation and Maintenance Guide Sump Pump
Diassembly and Re-assembly of SP25
a. Unscrew and remove Gate Valve (1), Ex-
haust Pipe (36), and Discharge Nipple (47)
from Impeller Housing (48).
b. Unscrew Allen Bolt (38) with Spring
Washer (8) to separate Motor Housing
(37) from Impeller Housing (48).
c. Now Unscrew Allen Bolt (7) with Spring
Washer (8) to separate Governor Housing
(6) from Motor Housing (37) and replace
it with a new one. (If found damaged)
d. Unscrew Impeller (43) from Rotor Body
(25) and replace it with a new one. (If
found damaged).
e. Now remove motor assembly (Parts in
Detail B) from Motor Housing (37).
f. Unscrew Governor Body (18) (Clockwise)
from Rotor Body (25). Now remove Pin
(19) from Governor Body (18) to remove
Governor Weight (17) and replace it with a
new one. (If found damaged)
g. Remove Upper-End Plate (22) from Rotor
Body (25) to remove Ball Bearing (20) &
Spacer (23) from Upper-End Plate (22)
and replace with a new one (If found dam-
aged)
h. Remove Cylinder (29) and Rotor Blades
(24) from Rotor (25). Now remove Roll
Pin (28) from Cylinder (25) and replace it
with a new one. (If found damaged)
i. Now push Rotor Body (25) from Lower
End Plate (30) side to remove Rotor Body
(25). Now remove Impeller Sleeve (41)
from Upper Wear Plate (40) and remove
O-ring (42) and replace it with new ones.
(If found damaged)
j. Now remove Ball Bearing (32) and O-ring
(31) from Lower End Plate (30) and
replace them with new ones. (If found
damaged)
k. Now remove Spacer for Rotor (27) and
O-ring (26) from Rotor Body (25).
l. Now remove the Upper Wear plate (40),
O-ring (39), and Oil Seal (34) from Motor
Housing (37) and replace them with new
ones. (If found damaged)
m. Now remove Seal Plate (35), Oil seal (34),
Gasket (33), and O-ring (21) from Motor
Housing (37) and replace it with new ones. (If
found damaged)
n. Now remove Internal Circlip (15) from Gov-
ernor Housing (6) using Circlip remover to
remove Governor Valve Cage (14).
o. Now remove O-ring (5) from Governor Valve
Cage (14)
p. Now remove Internal Circlip (9) from Gov-
ernor Valve Cage (14) using circlip remover.
Now remove Spring Retainer (10), spring
(11), Governor Valve (12) & Pin (13) from
Governor Valve Cage (14) and replace them
with new ones. (If found damaged)
q. Now remove Internal Circlip (2) from Air
Inlet Bushing (4) using circlip remover. Now
remove Air Strainer (3) from Air Inlet Bush-
ing (4)
r. Now unscrew Air Inlet Bushing (4) from
Governor Housing (6) and O-ring (5) from
Air Inlet Bushing (4) replace it with new
ones. (If found damaged)
s. Now insert a 6 mm diameter rod (1/4”) into
the holes in the underside of impeller housing
(46) and evenly tap the Lower Wear Plate out
of the housing.
t. When reassembling the pump, there should
be a clearance of 0.15 mm (0.007”) to 0.3 mm
(0.012”) add the appropriate thickness of
shims under the lower wear plate (30). Insure
that the shims slots are aligned with the three
knockout holes in the impeller housing (48).
When assembling Motor Housing (37) the
Upper-End Plate (22) must protrude above
the Motor Housing (37), between 0.035 mm
(0.001”) and 0.075 mm (0.003”). If not add
shims - similar to wave washers.
u. Ensure while assembly of Upper-End Plate
(22) with Cylinder (29) that holes are aligned.
v. Now follow the above steps in reverse manner
to reassemble the Sump Pump.
Disassembly and Re assembly SP25
Disconnect the air supply to the pump.