f.
Using two flat blade screwdrivers, pry main
(2) Check body (19) and case (21) carefully
for cracks or damage.
seal (13) from pump body. Use the two recesses in
(3) Check bearing surfaces within hub of
pump body at edges of seal for this purpose. Discard
body (19). This surface must be free of scratches, nicks,
seal. Pressure should be applied evenly to both sides of
and burrs.
seal to prevent damage to pump body. Blocking under
(4) Check all threaded parts for crossed or
screwdriver will increase leverage.
Note:
otherwise damaged threads.
(5) Check condition of all gaskets. Discard
At this point in disassembly, check
broken or cracked gaskets.
condition of bearings to determine if
c. Repair or replace parts of pump assembly as
further disassembly is necessary. If
required, noting the following:
further disassembly is necessary,
(1) Replace bolt (8), seal assembly (10 and
continue with succeeding steps. If not,
13), and bearings (17) at overhaul, regardless of their
apparent condition.
reassemble pump assembly.
Note:
g. Using snap ring pliers, remove snap rings (14)
Seal assembly (10 and 13) on original
from both ends of shaft (18) within body hub.
unit contains viton rubber components.
CAUTION
Replacement seals contain Teflon
Do not hammer shaft and bearings
components.
Therefore, on first
from body as damage to shaft and
overhaul of unit, the replacement seal
body will result.
may look different than the seal being
h. Using an arbor press and a large socket or a
replaced.
piece of pipe, press shaft and bearing assembly (15)
(2) Remove minor scratches from sealing
from body.
surface of impeller (12) and from interior of body (19)
i.
Remove snap rings (16) from shaft.
hub. Use crocus cloth, Federal Specification P-C-451.
j.
Using arbor press and large socket or piece of
Polish in direction of part rotation only, never cross
pipe, press bearings (17) off shaft. Discard bearings.
sealing or bearing areas. Reclean parts per step a,
k. Remove plugs (20)) from case, to complete
preceding, after repair.
disassembly of pump assembly.
l.
If necessary for replacement, remove
7-15.
Assembly
identification plate (22) from body (19).
Assemble the pump assembly using figure 7-3 and the
7-14.
Cleaning, Inspection, and Repair
following steps as guides:
a. Using snap ring pliers, insert snap ring (14) in
WARNING
groove within body (19) hub on side toward impeller.
Use cleaning solvent in well-
CAUTION
ventilated area. Avoid breathing of
Use care when installing bearings not
fumes and excessive contact with
to allow them to cock to one side.
skin. Keep away from open flame.
Scoring of bearing surface in hub and
Wash hands before eating or
preloading of bearings may result.
smoking.
b. Using an arbor press and a piece of pipe,
CAUTION
press one new bearing (17) into body hub. Insert from
Do not use wire brush or other
brake side of hub and press carefully down against snap
materials which might scratch metal
ring. Use care not to press against bearing surfaces.
surface on sealing surface of impeller
c. Using snap ring pliers, install two snap rings
or on bearing surface within body
(16) into grooves on shaft (18) away from woodruff key
hub.
recess.
a. Clean all portions of the pump assembly
d. Install shaft (18) in body hub and press into
thoroughly to remove buildup of spray fluid residue, dirt,
bearing using an arbor press. Press in carefully, until
lubricants, and sealants. Use cleaning solvent per
snap ring on shaft contacts bearing.
Federal Specification P-D-680 to remove oily
e. Using arbor press and a large socket or piece
substances.
A stiff wire brush may be used on
of pipe, press remaining bearing (17) onto shaft. Press
nonsealing areas such as the impeller face and body
carefully down against snap ring on shaft. Use care not
casting to remove caked material.
to press against bearing surfaces.
b. Inspect condition of all components and
f.
Using snap ring pliers, install second snap ring
replace any parts not found to be usable. Make the
(14) into groove in body hub.
following specific checks:
g. Using arbor press and a large socket or piece
(1) Check sealing surface within impeller hub
of pipe, carefully press new main seal (13) into
(12, fig. 7-3). This surface must be clean and smooth for
assembly.
7-7
