Gorman-Rupp Pumps 81 1/4B3-E.33 1P 24971 and up - Manual (Page 22)

80 SERIES OM−00793
MAINTENANCE & REPAIR PAGE E − 4
PUMP AND SEAL DISASSEMBLY
AND REASSEMBLY
Review all SAFETY information in Section A.
Follow the instructions on all tags, label and de-
cals attached to the pump.
This pump requires little service due to its rugged,
minimum-maintenance design. However, if it be-
comes necessary to inspect or replace the wearing
parts, follow these instructions which are keyed to
the sectional view (see Figure 1) and the accompa-
nying parts list.
This manual will alert personnel to known proce-
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel. However,
this manual cannot possibly anticipate and provide
detailed precautions for every situation that might
occur during maintenance of the unit. Therefore, it
is the responsibility of the owner/maintenance per-
sonnel to ensure that only safe, established main-
tenance procedures are used, and that any proce-
dures not addressed in this manual are performed
only after establishing that neither personal safety
nor pump integrity are compromised by such prac-
tices.
Before attempting to service the pump, disconnect
incoming power to the motor and lock it out to en-
sure that it will remain inoperative. Close all valves
in the suction and discharge lines.
For motor disassembly and repair, consult the lit-
erature supplied with the motor, or contact your lo-
cal motor representative.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man-
ual.
2. Unplug the motor power cable
from the electrical outlet to ensure
that the pump will remain inopera-
tive.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau-
tiously.
7. Drain the pump.
Suction Flap Valve Removal and Disassembly
Before attempting to service the pump, remove the
pump casing drain plug (9) and drain the pump.
Clean and reinstall the drain plug.
To service the suction check valve, impeller (2) or
seal assembly (3), disconnect the suction and dis-
charge piping.
To remove check valve assembly (13), disengage
capscrews (11) and separate the suction flange
(12) and flap valve assembly from the suction head
(10).
Remove the round head machine screw and lock
washer (17 and 18) to disassemble the flap valve
assembly.
Impeller Removal
Remove the hardware (20 and 21) and separate
the suction head (10) from the pump casing. Re-
move the casing gasket (8) from the groove in the
casing.
To remove the impeller, first remove the cover from
the back end of the motor. There is a 7/16-inch flat
on the motor shaft. Use an open end wrench
across the flat to immobilize the motor shaft.
Use a soft-faced maller to strike the impeller in a
counterclockwise direction until the breaks loose,
then unscrew it from the shaft.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (15)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.