Gorman-Rupp Pumps 4D-B 461594 and up - Manual (Page 24)

D SERIES OM--01505
MAINTENANCE & REPAIR PAGE E -- 10
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 views (see Figures 1, 2, 3 and 4) and
the accompanying parts lists.
Most service functions may be performed without
separating the pump and gearbox from the motor.
If major repair is required, the pump, gearbox and
motor must be disconnected.
Before attempting to service the pump, shut off in-
coming power to the motor and lock it out to ensure
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. Shut off incoming power to the mo-
tor and lock it out to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Close the discharge valve (if
used).
5. Drain the pump.
Before attempting to service the pump, drain the
pump by removing the drain plug (11, Figure 2).
Clean and reinstall the drain plug.
Suction And Discharge Check Valve Removal
(Figure 2)
To service the suction and discharge check valves,
remove the suction and discharge piping.
To service the suction check valve assembly (32),
remove the suction accumulator (3) by disconnect-
ing the hardware (8 and 9) securing it to the dia-
phragm pot (1). Remove the hardware (5 and 6) se-
curing the valve seat (31) and check valve assem-
bly to the diaphragm pot. Pull the check valve as-
sembly from the suction port.
To service the discharge check valve assembly
(25), loosen the hardware (21 and 22) and remove
the assembled outboard discharge elbow (23),
check valve, and seat (24). Remove the gasket
(19).
Remove the hardware (16 and 17) securing the
valve seat (24) and discharge check valve assem-
bly to the discharge elbow.
To remove the inboard discharge flange (18), loos-
en the hardware (14 and 15) securing the flange to
the diaphragm pot. Remove the gasket (12).
The suction and discharge check valve assemblies
are identical parts and operate in the same direc-
tion. For removal and/or replacement, remove the
hardware (29, 30, 35 and 36) securing the check
valve weights (26, 28, 33 and 34) to the check
valves (27 and 37). Inspect and replace as re-
quired.
If no further disassembly is required, see Suction
And Discharge Check Valve Installation.
Diaphragm Removal
(Figure 1)
To remove the diaphragm (6, Figure 3), disengage
the hardware (28, 29 and 30) and remove the dia-
phragm pot assembly (31). Inspect the diaphragm
ring (20) for wear or damage. If replacement is re-
quired, the gearbox assembly (25) and the eccen-
tric guard (39) must be removed.
(Figure 3)
Remove the nuts (10). Separate the lower dia-
phragm plate assembly (8) from the diaphragm (6)