Gorman-Rupp Pumps 83D20-B 733876 and up - Manual (Page 25)

OM-00889 80 SERIES
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, lock out or
disconnect the power source to ensure that it 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. Lock out or disconnect 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.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­
age to equipment. Suction and dis­
charge hoses and piping must be re­
moved from the pump before lifting.
Suction Check Valve Disassembly
Before attempting to service the pump, remove the
pump casing drain plug (42) and drain the pump.
Clean and reinstall the drain plug.
To service the suction check valve, remove the suc­
tion piping. Remove the nuts (54) securing the suc­
tion flange (45) and the check valve assembly (47)
to the pump casing (1). Pull the check valve assem­
bly from the suction port.
Inspect the check valve parts for wear or damage.
If replacement is required, remove the hardware
(48 and 49) and separate the valve gasket (52) and
weights (50 and 51).
If no further disassembly is required, see Suction
Check Valve Installation.
Pump Casing Removal
To service the impeller (2), wear plate (36) and seal
assembly (3), disconnect the discharge piping.
Remove the hardware securing the pump casing
(1) to the base.
Remove the nuts (32) securing the pump casing
(1) and gasket set (34) to the pedestal (16) and seal
plate (35). Install a standard 5/8-11 UNC lifting
eye in the tapped hole in the top of the pump cas­
ing. Be sure to screw the eye into the casing until
fully engaged. Use a hoist and sling of suitable ca­
pacity to separate the casing from the seal plate
and pedestal.