Gorman-Rupp Pumps 112A20-B 814882 and up - Manual (Page 26)

10 SERIES OM−00701
MAINTENANCE & REPAIR PAGE E − 6
to loosen the taper fit between the impeller and the
shaft.
Seal Removal and Disassembly
This pump is designed with two seals; a primary
mechanical seal (3) located directly behind the im-
peller, and a secondary oil seal (31) located at the
back of the seal oil cavity. If the liquid being
pumped begins to leak past the oil seal, both seals
should be replaced as soon as possible.
Remove the air vent and piping (6, 7 and 8) from
the seal plate (33).
Remove the seal spring. Apply oil to the shaft in the
area of the mechanical seal bellows. Slide the ro-
tating portion of the seal off the shaft.
Remove the machine screws (12) and slide the
seal plate, remaining stationary mechanical seal
components, and oil seal off the shaft as a unit. Be
careful not to drop or damage the seal compo-
nents when removing the seal plate.
Use a dowel or other suitable tool to press the sta-
tionary element, seat and O-rings out of the seal
plate from the back side.
Use a screwdriver or other suitable tool to press or
pry the oil seal (31) out of the seal plate. Be careful
not to scratch or damage the seal plate bore.
If no further disassembly is required, see Seal
Reassembly and Installation.
Shaft and Bearing Removal and Disassembly
When the pump is properly operated and main-
tained, the pedestal should not require disassem-
bly. Disassemble the shaft and bearings only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly-
equipped shop by qualified personnel.
Remove the pedestal drain plug (91) and drain the
pedestal. Clean and reinstall the plug.
Remove the hardware securing the pedestal (28)
to the base. Remove the shaft key (24).
Remove the hardware (21 and 22) and slide the
outboard bearing cap and oil seal (20 and 23) off
the shaft as a unit. Remove the bearing cap gasket
(19) and bearing adjusting shims (26). Tie and tag
the shims or measure and record their thickness
for ease of reassembly.
Press the oil seal out of the bearing cap.
Remove the hardware (13 and 14) and slide the in-
board bearing cap and oil seal (15 and 30) off the
shaft as a unit. Remove the bearing cap gasket
(29).
Press the oil seal out of the bearing cap.
Place a block of wood against the impeller end of
the shaft and tap the shaft and assembled bear-
ings (16 and 18) from the pedestal bore. Be care-
ful not to damage the shaft.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and bear-
ings are removed.
Clean the pedestal, shaft and all component parts
(except the bearings) with a soft cloth soaked in
cleaning solvent. Inspect the parts for wear or dam-
age and replace as necessary.
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.