Gorman-Rupp Pumps 2D-X.75 3P 652300 thru 1462003 - Manual (Page 23)

OM−01479 D SERIES
MAINTENANCE & REPAIR PAGE E − 7
ing the discharge flange (24) and check valve as-
sembly to the diaphragm pot. Pull the check valve
assembly from the suction port.
Individual parts for the suction and discharge
check valve assemblies are not available. Replace
the complete assemblies if they are excessively
worn or damaged.
If no further disassembly is required, see Suction
And Discharge Check Valve Installation.
Diaphragm and Plunger Rod Removal and
Disassembly
(Figure 1)
Before attempting ro remove the diaphragm (11,
Figure 2), rotate the motor shaft until the eccentric
(1, Figure 2) is at the top of its stroke and the spring
(8, Figure 2) is decompressed.
Remove the tap screws (36) and eccentric guard
assembly (16).
Remove the hardware (20 and 21) securing the re-
tainer ring (14) to the diaphragm pot (28).
(Figure 2)
Loosen the socket head cap screw (2) and slide
the eccentric (1) off the motor shaft. Lift the as-
sembled plunger rod assembly and diaphragm out
of the diaphragm pot.
Inspect the diaphragm for excessive wear or tears.
To replace the diaphragm, disengage the nuts (14)
and remove the diaphragm plate (12) and dia-
phragm (11).
If the eccentric (1) requires replacement, remove
the capscrew (4) and separate the eccentric from
the rod end (3).
If the rod end or spring (8) requires replacement,
use a socket wrench to hold the plunger rod (13)
securely and unscrew the rod end.
To remove the spring, remove the jam nut (6),
spring centering washer (7) and spring (6).
Plunger Rod and Diaphragm Reassembly and
Installation
(Figure 2)
Slide the plunger rod (13) through the diaphragm
plate (9). Install the spring (8), spring centering
washer (7) and jam nut (6). Compress the spring to
the dimension shown in Figure 2 by tightening the
jam nut.
Screw the rod end (3) onto the plunger rod until
tight.
Position the eccentric (1) against the rod end. Ap-
ply Loctite Threadlocker No. 242" or equivalent
compound to the threads of the capscrew (4) and
secure the eccentric to the rod end with the caps-
crew.
Position the diaphragm (11) on the diaphragm
plate (12). Slide the studs in the diaphragm plate
through the holes in the upper diaphragm plate
and secure with the nuts (14).
(Figure 1)
Position the retainer ring (14) over the diaphragm.
Position the diaphram and plunger rod in the dia-
pragm pot (28) with the grease fitting (10, Figure 2)
facing away from the gear reducer (10).
If removed, secure the key (15) in the gear reducer
keyway with Loctite Retaining Compound No.
680" or equivalent and slide the eccentric over the
gear reducer shaft. Secure it by tightening the
socket head capscrew (2, Figure 3).
Secure the diaphragm and retainer ring to the dia-
phragm pot by tightening the hardware (20 and 21)
in an alternating sequence.
Install the guard (16) over the plunger rod and se-
cure it with the tapscrews (36).
Suction And Discharge Check Valve
Installation
(Figure 1)
Inspect the check valves and replace as required.
Individual parts for the suction and discharge
check valve assemblies are not available. Replace
the complete assemblies if they are excessively
worn or damaged.