Gorman-Rupp Pumps 81 1/2D3-E.75 1P 252952 and up - Manual (Page 22)

80 SERIES OM−00752
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.
Pump Casing and Vane Plate Removal
Before attempting to service the pump, remove the
pump casing drain plug (21) and drain the pump.
Clean and reinstall the drain plug.
To service the impeller (2), vane plate (6) or seal as-
sembly (3), disconnect the suction and discharge
piping.
Remove the nuts (9) securing the pump casing (1)
to the intermediate (19). Remove the pump casing
by pulling straight away.
Remove the casing gasket (20) and vane plate O-
ring (24).
To remove the vane plate, disengage the screws
(5).
Impeller Removal
Insert a large screwdriver in the slot in the end of
the motor shaft to prevent shaft rotation. Remove
the impeller jam nut (23). 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.
Seal Removal
(Figures 1 and 2)
Remove the seal washer (15), spring centering
washer and seal spring.
Apply oil to the seal area of the shaft and work it up
under the rubber bellows. Remove the hardware