Gorman-Rupp Pumps 12D1-1B20 1463862 and up - Manual (Page 24)

10 SERIES OM−06361
MAINTENANCE & REPAIR PAGE E − 6
PUMP AND SEAL DISASSEMBLY
AND REASSEMBLY
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals 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 views (see Figures 1 and 2) and the
accompanying parts lists.
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, shut down
the engine and take precautions7to ensure that it
will remain inoperative. Close all valves in the suc-
tion and discharge lines.
For engine disassembly and repair, consult the lit-
erature supplied with the engine, or contact your
local Yanmar engine representative.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man-
ual.
2. Shut down the engine and take
precautions to ensure that the
pump will remain inoperative.
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 Check Valve Disassembly
(Figure 2)
Before attempting to service the pump, remove the
pump casing drain plug (19) and drain the pump.
Clean and reinstall the drain plug.
To service the suction check valve, remove the suc-
tion piping. Remove the hex nuts (7) securing the
suction flange (26) to the pump casing (1). Pull the
check valve assembly (27) from the suction port.
Inspect the check valve assembly for wear or dam-
age. Remove the hardware securing the check
valve weights to the check valve. Replace parts as
required.
If no further disassembly is required, see Suction
Check Valve Installation.
Back Cover Removal
(Figure 2)
The wear plate (15) can be serviced after the back
cover assembly (25) has been removed.
Remove the wing nuts and washers (23 and 24) se-
curing the back cover to the casing. Pull the back
cover and assembled wear plate from the pump
casing. Inspect the wear plate for excessive wear
or scoring. If replacement is required, remove the
hardware (21 and 22) securing it to the back cover.
Remove the cover plate gasket (20) and clean the
mating surfaces.
Pump Casing Removal
(Figure 1)
To service the impeller or seal assembly, discon-
nect the discharge piping. Remove the hardware