OM-01490
D SERIES
MAINTENANCE & REPAIR
PAGE E - 11
To service the suction check valve assembly, re
move the suction accumulator (10) by disconnect
ing the hardware (13 and 14) securing it to the dia
phragm pot (1). Remove the hardware (7 and 8) se
curing the valve seat (15) and check valve assem
bly to the diaphragm pot (18). Pull the check valve
assembly from the suction port.
To service the discharge check valve assembly,
loosen the hardware (3 and 4). Remove the hard
ware (5 and 6) and remove the assembled dis
charge flange (1), check valve and seat (25). Re
move the gasket (24).
To remove the inboard discharge flange (23), loos
en the hardware (21 and 22) securing the flange to
the diaphragm pot. Remove the gasket (19).
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 (28 and 29) securing the check valve
weights (27 and 30) to the check valve (31). Inspect
and replace the parts as required.
If no further disassembly is required, see
Suction
And Discharge Check Valve Installation
.
Diaphragm Removal
(Figure 1)
To remove the diaphragm (9, Figure 3), disengage
the hardware (33, 34 and 35) and remove the dia
phragm pot assembly (36). Inspect the diaphragm
ring (37) for wear or damage. If replacement is re
quired, the gearbox assembly (10) and the eccen
tric guard (1) must be removed.
(Figure 3)
Remove the nuts (13). Separate the lower dia
phragm plate (11) from the diaphragm (9) and the
upper diaphragm plate (8). Inspect the diaphragm
and replace a required.
If no further disassembly is required, see
Dia
phragm Installation
.
Plunger Rod Removal And Disassembly
(Figure 1)
With the diaphragm pot assembly and diaphragm
removed, disengage the hardware (2, 3, 4, 42, 43
and 44) and remove the eccentric guard (1).
Removing the snap ring (6) and slide the plunger
rod assembly (27) off the eccentric cam (33, Figure
4).
(Figure 3)
Use a socket wrench to hold the plunger rod (14)
securely and unscrew the eccentric cap (1). Re
move the T‐type lockwasher (3), jam nut (4), spring
washer (5) and spring (6). Remove the flat washer
(7) and slide the plunger rod out of the upper dia
phragm plate (8).
Inspect the eccentric bearing (2) for excessive
wear. If replacement is necessary, use a suitable
tool to cut the bearing into sections and remove it
from the eccentric cap.
Be careful
not to damage
the eccentric cap.
Gearbox Removal And Disassembly
(Figure 1)
When properly operated and maintained, the gear
box assembly (10) should not require disassembly.
Disassemble the gearbox
only
when there is evi
dence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
Support the diaphragm ring (37) with wooden
blocks. Disengage the hardware (26 and 27) se
curing the gearbox to the diaphragm ring and re
move the diaphragm ring. Inspect the diaphragm
ring for wear or damage and replace as necessary.
It is not necessary to remove the drawbar (29) from
the diaphragm ring unless replacement is re
quired. Disengage the nuts (31) from the U‐bolts
(30) to remove the drawbar.
