Gorman-Rupp Pumps 12B9-B 723228 and up - Manual (Page 27)

10 SERIES OM-00582
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 E-1) and the ac­
companying 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
or lock out the power source to ensure that the
pump will remain inoperative. Close all valves in the
suction and discharge lines.
For power source disassembly and repair, consult
the literature supplied with the power source, or
contact your local power source representative.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man­
ual.
2. Disconnect or lock out the power
source 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 Removal
and Disassembly
Before attempting to service the pump, remove the
pump casing drain plug (37) and drain the pump.
Clean and reinstall the drain plug.
To service the suction check valve assembly (52),
remove the suction piping. Remove the nuts (51)
securing the suction flange (58), check valve gas­
kets (59), check valve seat (49) and check valve as­
sembly (52) to the pump casing (1). Separate the
check valve assembly from the check valve seat.
Inspect the check valve parts for wear or damage.
If replacement is required, remove the hardware
(54 and 55) and separate the check valve gasket
(56) and weights (53 and 57).
If no further disassembly is required, see Suction
Check Valve Installation.
Back Cover Removal
The wear plate assembly (38) is easily accessible
and may be serviced by removing the back cover
assembly (42). Loosen the clamp bar screw (47)
and remove the clamp bar (48). Pull the back cover
and wear plate from the pump casing. Remove the
back cover gasket (41). Clean the mating surfaces
of the back cover plate and pump casing.
Inspect the wear plate and replace it if badly scored
or worn. To remove the wear plate, disengage the
hardware (39 and 40) securing it to the back cover.
If no further disassembly is required, see Back
Cover Installation.