Gorman-Rupp Pumps SFV4A-X 1531245 and up - Manual (Page 41)

SFV SERIES X‐PROOF PUMPS OM-06628
MAINTENANCE AND REPAIR PAGE E - 18
ment is to remove the screws securing the seal
plate to the motor assembly. Pry the assembled
seal plate and stationary element off the shoulder of
the intermediate. Remove the O‐ring and press the
stationary element and seat out of the seal plate
from the back side.
If no further disassembly is required, proceed to
the appropriate areas in PUMP END REASSEMB­
LY.
Seal Removal (With Shaft Sleeve)
Carefully remove the spring retainer and seal
spring. Slide the shaft sleeve and rotating portion
of the seal off the shaft as a unit.
Apply oil to the sleeve and work it up under the rub­
ber bellows. Slide the rotating portion of the seal off
the shaft sleeve.
Work a pair of stiff wires with hooked ends between
the rotor shaft and the stationary seat and pull the
stationary seat and O‐ring out of the seal plate.
NOTE
An alternate method of removing the stationary ele­
ment is to remove the screws securing the seal
plate to the motor assembly. Pry the assembled
seal plate and stationary element off the shoulder of
the intermediate. Remove the O‐ring and press the
stationary element and seat out of the seal plate
from the back side.
Remove the seal sleeve O‐ring from the rotor shaft.
Proceed to PUMP END REASSEMBLY.
PUMP END REASSEMBLY
NOTE
Reuse of old O‐rings or shaft seal parts will result in
premature leakage or reduced pump performance.
It is strongly recommended that new O‐rings and a
new shaft seal be used during reassembly (see the
parts lists for part numbers).
Hardware Torque Values
When reassembling the pump, use the following
table to determine the proper torque values for
hardware.
Table E-1. Hardware Torque Values
TIGHTENING TORQUE
FASTENER
SIZE
DRY LUBRICATED
FT. LBS. NM FT. LBS. NM
M3 0.8 1,1 0.7 1,0
M4 1.9 2,6 1.2 1,7
M5 3.8 5,1 2.5 3,4
M6 6.5 8,8 52.2 4.3
M8 15.8 21,4 10.7 14,5
M10 32.4 44 22.1 30
M12 54.8 74 36.9 50
M14 87.8 119 58.3 79
M16 135.0 183 89.2 121
M20 273.0 370 180.0 244
M24 220.0 298 145.3 197
M30 421.0 571 276.0 374
Cleaning and Inspection of Pump Parts
With the pump inverted, stuff a clean tissue into the
stationary seal seat bore of the intermediate or
wrap a small rag around the shaft to prevent for­
eign material from entering the motor cavity.
Carefully inspect any O‐rings before removal and
cleaning to determine if a proper seal existed prior
to disassembly. If sealing was faulty or question­
able, the cause must be determined and corrected
before reassembly. Replace any parts as required.
Thoroughly clean all reuseable parts with a soft
cloth soaked in cleaning solvent. Remove all O‐
rings and clean the sealing surfaces.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven­
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­
ers.
Inspect the rotor shaft for damaged threads, scor­
ing, or nicks. Remove nicks and burrs with a fine