Gorman-Rupp Pumps 2D-E.50 1P 649393 thru 1485340 - Manual (Page 24)

D SERIES OM−01476
MAINTENANCE & REPAIR PAGE E − 8
Position the discharge check valve (28) against the
diaphragm pot with the weight positioned as
shown in Figure 1. Secure the discharge flange
(20) and diaphragm to the diaphragm pot with the
hardware (19, 22 and 23).
Position the suction check valve (21) against the di-
aphragm pot with the weight positioned as shown
in Figure 1. Secure the suction flange (30) and dia-
phragm to the diaphragm pot with the hardware
(29).
Check the operation of the check valves to ensure
proper seating and free movement.
Connect the suction and discharge piping as de-
scribed in INSTALLATION, Section B.
Refer to OPERATION, Section C before starting
the pump.
LUBRICATION
Plunger Rod Assembly
(Figure 2)
The rod end should be lubricated thor-
oughly after each 8 hours of operation.
Failure to do so may cause the rod end
bearing to overheat and fail.
Before attempting to lubricate the plunger rod as-
sembly, rotate the eccentric cam until the upper
grease fitting (5) can be accessed through the
slotted hole in the eccentric guard (13, Figure 1).
Use a grease gun to apply No. 2 lithium base
grease to the upper lubrication fitting until grease
escapes from the eccentric cap. Lubricate the low-
er fitting (10) until grease escapes from the top of
the upper diaphragm plate inside the spring.
Gear Reducer
(Figure 1)
The gear reducer was fully lubricated when
shipped from the factory. Change the oil in a new
gearbox at operating temperature after 100 hours
of operation or four weeks, whichever comes first.
To drain the oil, remove the lowermost pipe plug lo-
cated below the output shaft. After draining, rein-
stall the drain plug and flush the case thoroughly
with a light oil. Remove the drain plug and drain the
flushing oil. Reinstall the drain plug.
To lubricate the gear reducer, add ISO Grade
VG150 gear oil through the hole for the vented plug
(5) until the oil reaches the level of the pipe plug lo-
cated in the middle of the gear reducer housing be-
low the output shaft. Check the oil regularly and
maintain it at this level.
Monitor the condition of the bearing lubri-
cant regularly for evidence of rust or mois-
ture condensation. This is especially im-
portant in areas where variable hot and
cold temperatures are common.
The lubricant supplied with the gear reducer is suit-
able for operating temperatures between 14
_F and
122 _F (−10_C and 50_C). If operating below 14_F
(−10
_C) use an ISO Grade VG68 oil. If operating
above 122 _F (50_C), use an ISO Grade VG320 oil.