OM-01479
D SERIES
MAINTENANCE & REPAIR
PAGE E - 7
NOTE
When appropriate recycling facilities are available,
the user should recycle components and fluids
when doing any routine maintenance / repairs and
also at the end of the pump’s useful life. All other
components and fluids shall be disposed of ac
cording to all applicable codes and regulations.
Suction and Discharge Check Valve Removal
(Figure 1)
To service the suction and discharge check valves,
remove the suction and discharge piping.
To service the suction check valve assembly (27),
remove the hardware (20) securing the suction
flange (28) and check valve assembly to the dia
phragm pot (24). Pull the check valve assembly
from the suction port.
To service the discharge check valve assembly
(22), remove the hardware (17, 20, and 23) secur
ing the discharge flange (22) 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 (29) and eccentric guard
assembly (15).
Remove the hardware (16 and 17) securing the re
tainer ring (13) to the diaphragm pot (24).
(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 (8).
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 (13) over the diaphragm.
Position the diaphragm and plunger rod in the di
aphragm pot (24) with the grease fitting (10, Figure
2) facing away from the gear reducer (9).
