OM-07297
DIAPHRAGM PRIMER
MAINTENANCE & REPAIR
PAGE E - 6
NOTE
Whenever complete disassembly is necessary it is
recommended to remove the Diaphragm Primer
from the pump. The unit should be moved to a clean
working area, such as a workbench, for disassem
bly and reassembly.
Diaphragm Primer Removal
See documentation or manual provided from
pump manufacturer.
Diaphragm Primer Disassembly
(Figure E-1 & E-2)
To inspect the two outer valves, remove the suction
port (8). Disengage the cap screws (16) and sepa
rate the port and gasket (7) from the upper housing
(5). To remove the discharge port (8), disengage
the cap screws (16) and separate the port and gas
ket (7) from the lower housing (4).
Inspect the exposed valves (32) for wear or dam
age. To remove either valve, further disassembly is
necessary as described in the following instruc
tions.
To remove the upper housing (5), disengage the
mounting hardware (11, 12 and 13). Remove the
upper housing and disengage the retaining ring
(33) to remove the valve (32), washers (31) and re
taining pin (30) from the housing.
To inspect or replace the inner two valves (32), dis
engage the diaphragm assembly mounting hard
ware (9 and 10). Remove the diaphragm assembly
(6) from the lower housing (4). If the assembly
needs to be gently pried around the edges, use
caution not to damage the diaphragm. If the di
aphragm assembly (6) is damaged, it is recom
mended that it be replaced.
To replace the inner two valves (32) disengage the
retaining ring (33). Remove the valve (32), washers
(31) and retaining pin (30) from the diaphragm as
sembly. The discharge port valve can now be ac
cessed and replaced if necessary by disengaging
the retaining ring (33) and removing the valve (32)
and retaining pin (30) from the lower housing (4).
To remove lower housing (4) disengage the 4 cap
screws (43) and lift it off of the bearing housing.
With the lower housing removed, the neck seal (3)
is visible for inspection. If the seal is torn and leak
ing it should be replaced. When removing the seal,
use caution not to damage the machined surfaces
of the bearing housing (1).
Before further disassembly is completed, the bear
ing oil should be drained into an appropriate con
tainer. To drain the bearing housing (1) remove the
pipe plug (23) from the bottom. Clean and reinstall
the pipe plug.
In order to inspect or replace internal components,
the inspection cover (34) will need removed. Dis
engage the cap screws (16) and washers (17) fas
tening the inspection cover to the bearing housing
(1). Remove the inspection cover and gasket (35).
It is recommended that the gasket be replaced, not
reused, once removed.
With the inspection cover removed it may be possi
ble to see if internal components, such as the
slingers (22), connecting rod assembly (2) and
crankshaft (27) are damaged or worn.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
To remove the drive end bearing cover (29) disen
gage the cap screws (16). Slide the cover off the
end of the shaft using caution not to damage the
shaft or oil seal (28). Remove and discard the O‐
ring (20). It is recommended that the oil seal and
O‐ring be replaced once removed from the pump.
To remove the opposite bearing cover (15) disen
gage the cap screws (16). Slide the cover off of the
bearing housing (1). Remove and discard the O‐
ring (20). The O‐ring should not be reused.
