Gorman-Rupp Pumps 3D-B 883512 and up - Manual (Page 31)

OM−01490 D SERIES
MAINTENANCE & REPAIR PAGE E − 15
flammable. Use them only in a well-ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Use a suitably sized dowel and an arbor (or hy-
draulic) press to install a new eccentric bearing (2)
into the eccentric cap until fully seated.
Slide the plunger rod (14) through the upper dia-
phragm plate (8). Install the flat washer (7), spring
(6), spring washer (5) and jam nut (4). Compress
the spring to the dimension shown in Figure 3 by
tightening the jam nut.
Install the T-type lockwasher (3). Apply ‘Loctite No.
242 Threadlocker’ or equivalent compound on the
plunger rod threads and screw the eccentric cap
on until tight.
NOTE
The lubrication fitting (15) in the diaphragm plate
must face the same direction as the lubrication fit-
ting (16) in the eccentric cap.
Lubricate the eccentric bearing (2) with a thin coat-
ing of No.2 lithium base grease.
Diaphragm Installation
(Figure 3)
Position the diaphragm (9) on the upper dia-
phragm plate, making sure the lip is properly
seated. Slide the studs (12) in the lower diaphragm
plate (11) through the holes in the upper plate and
secure with the nuts (13).
(Figure 1)
Install the plunger rod assembly (28) onto the ec-
centric cam (33, Figure 4) and secure with the snap
ring (7).
Install the eccentric guard (1) and secure it with the
hardware (2, 3, 4, 42, 43 and 44).
Lubricate the plunger rod assembly as described
in LUBRICATION, Section E.
Secure the diaphragm pot assembly (36) to the di-
aphragm ring (37) with the hardware (33, 34 and
35).
Suction And Discharge Check Valve
Installation
(Figure 2)
Inspect the check valve components and replace
as required. Subassemble the check valve weights
(27 and 30) and check valves (31) with the hard-
ware (28 and 29).
If the inboard discharge flange (23) was removed,
clean the mating surfaces and install the gasket
(19). Secure the flange to the diaphragm pot with
the hardware (21 and 22).
Subassemble the valve seat (25) and discharge
check valve (26) to the discharge elbow (1) with the
weights positioned as shown in Figure 2. Secure
with the hardware (3 and 4).
Clean the mating surfaces of the valve seat and dis-
charge flange (23). Install the gasket (24) and se-
cure the outboard discharge flange, check valve,
and seat to the inboard discharge flange with the
hardware (5 and 6).
Check the operation of the check valve to ensure
proper seating and free movement.
Clean the mating surfaces of the valve seat (5) and
suction accumulator (10). Position the suction
check valve, valve seat (15) and gasket (16)
against the diaphragm pot (19) with the weights
positioned as shown in Figure 2. Secure with the
hardware (7 and 8).
Check the operation of the check valve to ensure
proper seating and free movement.
Secure the suction accumulator (10) to the dia-
phragm pot with the hardware (13 and 14).
Connect the suction and discharge piping as de-
scribed in INSTALLATION, Section B.
Refer to OPERATION, Section C before starting
the pump.