Gorman-Rupp Pumps 3D-B 883512 and up - Manual (Page 27)

OM−01490 D SERIES
MAINTENANCE & REPAIR PAGE E − 11
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.
Disengage the hardware (23 and 24) and remove
the coupling guard (11). Loosen the attaching
hardware, separate the coupling halves (13 and
14) and remove the spider (15). Remove the gear-
box assembly and slide the coupling half off the
pinion drive shaft (26, Figure 4).
(Figure 4)
Before attempting to disassemble the gearbox as-
sembly, drain the lubricant by removing the oil cup
(29) and turning the gearbox on its side. Clean and
reinstall the oil cup.
Remove the two lower and the five upper pieces of
hardware (8, 9 and 10) securing the cover plate (7)
to the gear housing (1). Pull the bearing housing
(16) and cover plate from the pinion shaft (31) and
gear (15). Remove the gasket (6) and clean the
mating surfaces. Replace the gasket as necessary.
Remove the remaining two pieces of hardware (9
and 10) and separate the cover plate from the bear-
ing housing. Remove the gasket (14) and clean the
mating surfaces. Replace the gasket as necessary.
To disassemble the pinion drive shaft components,
remove the key (20) and pry the oil seal assembly
(21) from the bearing housing. Press the oil seal
(23) from the seal adaptor (22).
Remove the washer (19) and slide the assembled
pinion drive shaft (26), bearings (25 and 25A) and
sleeve (27) from the bearing housing.