TM5-4610-218-34
straight edge placed across the flat portion of
d. Clean, Inspect and Repair,
the diaphragm.
(1) Clean all parts with dry cleaning sol-
(e) Reinstall the knurled gear shift cap.
vent P-D-680.
(6) Reassemble the solution feeder di-
(2) Inspect top housing cover, gear unit
aphragm pump as shown in figure 5-19.
housing, and the lever and drive arms for
cracks.
(7) Reassemble the drive arms as illus-
trated in figure 5-18.
(3) Inspect the gears and shafts for worn,
chipped or broken teeth.
f. Installation.
(4) Inspect push rods for misalignment,
(1) Install the chemical solution feeder di-
worn or damaged threads.
aphragm pump bodies as shown in figure 5-17.
(5) Inspect the electrical components and
(2) Install the chemical solution feeder as
spacers for deterioration and damage.
shown in figure 5-17.
(6) Repair or replace all unserviceable parts
(3) Lubricate the chemical solution feeder
not conforming to the Repair and Replacement
as indicated in LO 5-4610-218-12.
Standards indicated in table 5-1.
(4) The rate of discharge from each pump
e. Reassembly.
shall be within plus or minus 5 percent of indi-
cated rate at any scale setting and operate
(1) Reassemble the gear unit as illustrated
against a back pressure from 0 to 5 PSIG and a
in figure 5-23.
suction lift from 0 to 6 feet.
(2) Install the gear unit as illustrated in
( 5 ) Installation must be such that
siphoning cannot occur, be sure all hose con-
(3) Refer to figure 5-21 and reassemble the
nections are tightly secured. Filtered water shall
junction box cover, receptacle, top housing and
be used as the testing solution.
lever arm shaft.
(6) With a suction lift of not less than 1
(4) Reassemble the lever arms and push
foot (30.48 cm) and 4 feet (1.219 m) discharge
rods as illustrated in figure 5-20.
pressure, measure volumetrically the discharge
for one minute at a scale setting of 1.2 from
(5) Prior to test procedure or operation,
each head. Volume from each pumping head
each diaphragm on each pump shall be adjusted
shall be 33.2 (plus or minus 1.6) ml/min.
as follows:
(7) Measure volumetrically the discharge for
(a) Set the length of stroke adjustment
one minute at a scale setting of 6.0 from each
on the feeder scale at 6.0.
head. Volume from each pumping head shall be
(b) Remove the knurled gear shift cap
166 (plus or minus 8.3) ml/min
(located on the side of the feeder housing).
(8) The interval of time after any change of
(c) Rotate the knurled shift nut until the
the scale setting and before measuring shall be
pump push rod is pulled back as far as it will
not less than two minutes.
go.
(9) Failure of the chemical solution feeder
to function as specified will require readjust-
(d) Screw the diaphragm on the push rod
ment of the pumping head diaphragms and re-
to such a point that the center of the diaphragm
has .12 inch (3.05 mm) clearance between a
testing.
5-21
