OM-07297
DIAPHRAGM PRIMER
MAINTENANCE & REPAIR
PAGE E - 10
same sloped angle. Install the cap screw (9) and
the flat washer (10). Torque to 60 ft-lbs (81.35
N-m) and cover screw head with grease (GR P/N
18685-021).
Pre-assemble the upper housing (5) with the
valve (32) and suction port (8). Insert the retaining
pin (30) through the washer (31). Insert the retain
ing pin (30) through a valve (32) and another wash
er (31). The high side of the valve should be to
wards the shoulder on the retaining pin (30).
With the top of the upper housing (5) facing down
and the machined valve pocket facing up, install
the retaining pin (30) holding the valve (32) into the
center hole of the valve opening. While holding the
valve in place, flip over the upper housing. Install
the retaining ring (33), with sharp edge of retaining
ring is towards the small end of the retaining pin,
into the groove on the retaining pin (30) with pliers.
Lay the upper housing (5) flat on the work table
with the retaining ring (33) facing up. Line up the
suction port gasket (7) with the four tapped holes
around the installed valve. With the opening of the
port turned 90° to the right hand side from the cen
ter hole in the upper housing (4) (with the GR logo
of the upper housing closest to you on the table)
line up the suction port (8) with the four holes of the
gasket (7). Install cap screws (16) and lock wash
ers (17). Torque all four to 9 ft-lbs (12.20 N-m).
Lay the upper housing (5) over the lower housing
(4) lining up the holes around the edge. Ensure
that the diaphragm lines up with the lip in the upper
housing. It functions as the gasket used between
the housings and creates the seal. The upper
housing should be oriented with the suction port
(8) opening being turned 180° from the discharge
port (8) on the lower housing (4). Install cap screws
(11) from the top of the upper housing (5). Install
the washers (13) and nuts (12) from the bottom.
Torque all eight to 38 ft-lbs (51.52 N-m).
Once re-assembly is complete ensure that all
pipe plugs (23 and 36), sight gages (37), and the
vent assembly (38, 39 and 40) are installed and
tight on the bearing housing (1). It is okay if the pipe
plug (36) is not yet installed if you intend to fill the
bearing housing with bearing oil at this time (see
the installation section of this manual). A thread
sealant should be used when installing the thread
ed pipe plug (23) into the bottom of the bearing
housing (1).
Lubrication
(Figure E-2)
The bearing housing (1) was fully lubricated when
shipped from the factory. Check the oil level regu
larly through the sight gauges (37)
and maintain it
at ¾ full when not running and ¼ full when running.
When lubrication is required, remove the pipe plug
(36) and add SAE No. 30 non‐detergent oil through
the opening. When lubricating a dry (overhauled)
bearing housing, fill the bearing cavity with approx
imately 400 ml (13.53) of oil. Clean and reinstall the
pipe plug.
Do not
over‐lubricate. Over‐lubrication
can cause the bearings to over‐heat, resulting in
premature bearing failure.
Under normal conditions, drain the bearing hous
ing once each year, or every 500 hours of operating
time, and refill with clean oil. Change the oil more
frequently if the pump is operated continuously or
installed in an environment with rapid temperature
change.
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.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.
Diaphragm Primer Installation
See documentation or manual provided from
pump manufacturer.
