Specifications

15
Figure 11
BLB Series
Assembly
#1 #3
#4 #2
#1 #3#5
#4 #2#6
Considerable care should be taken to
prevent wedging or jamming. Never
force parts together. They will drop into
place if properly aligned.
1) Provide a can of clean oil, preferably
SAE-50 motor oil or mineral oil.
2) Using the Driven Metering Gear (7) as
an upright guide, press the Arbor (9),
using an arbor press, into the Front
Side Plate (2) until flush with the out-
side of the plate. Apply a light film of
oil to the Arbor (9) before pressing it
into the plate.
3) Making sure that the surfaces are
clean, place the Center Plate (4) on
top of the inside surface of the Rear
Side Plate (3). Be sure that the port
hole sizes on the Center Plate coin-
cide with the port holes on the Rear
Side Plate. The thicker center plates
have only a short portion of the dowel
hole precision ground. This ground
portion should be placed adjacent to
the rear plate.
4) Insert the lightly oiled Dowels (10) into
the Center Plate (4) and carefully
press them into the Rear Side Plate
(3) and flush with its outer surface.
5) Place the sub-assembly on a clean
bench top. Making sure that the
Center Plate (4) and Rear Side Plate
(3) are in close contact, insert the
Driving Gear (6) and Driven Gear (7)
into their respective gear pockets.
Do not force the gears into the gear
pockets. If force is necessary, there is
something wrong, and the plates and
gears should be checked for burrs,
dents, or the like.
6) Install the Drive Shaft (5) and the
Drive Shaft Key (8) into the Driving
Gear (6) and the lightly oiled bearing
of the Rear Side Plate (3). Turn the
drive shaft to assure free rotation of
the gears. If there is any binding,
remove the gear shaft and key and
examine for damage.
7) Apply a thin coat of oil to the drive
shaft bearing and arbor of the Front
Side Plate (2) and place into position
over Center Plate (4).
8) Insert Binder Screws (21) finger tight
and rotate drive shaft to insure free
rotation.
9) Clamp pump into vise by front side
plate edges, Rear Side Plate (3) facing
upward. Tighten Binder Screws (21)
in the order shown in Figure 11 to 390
lbs.-in., 50% of the full recom-mended
tightening torque. Rotate to make sure
the pump turns freely.
10) Tighten Binder Screws (21) in the
order shown in Figure 11 to the full
recommended tightening torque of
780 lbs.-in. Rotate to insure free
rotation.
11) Install Seal Assembly per instructions
on page 18.
Note: If the pump does not turn freely
after each component is installed, then
the last piece installed needs additional
attention or replacement.
New pumps may occasionally develop
intermittent bind points or tight spots.
Since precision metering requires minute
tolerances, this is perfectly normal and
will pass quickly as the pump “wears
in.”
If a tight spot is interfering with operation,
it can be reduced or minimized by lifting
one of the metering gears out of the
center plate and rotating it a few teeth.