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 STEP 12.
Remove and discard the two
STEP 6.
Make certain that shaft snap
O-Rings (Item 11) between
rings are secure; break off
end covers and pump center
and smooth up any sharp edges
sections.
on the sides of the gears.
DO NOT REMOVE drive shaft
STEP 13.
STEP 7.
Depress the seal pressurizing
seal (Item 2) in the front
valve.
(items 18,19,20 and
cover (Item 5) unless it is
21) to be sure that there is
damaged or is leaking. If
some resistance but that move-
this seal must be replaced
ment is free.
use care not to damage the
seal recess in the front
STEP 8.
Check bearing bore diameters
cover.
in front and rear covers
(Items 5 and 31) for wear.
Heating the cover to 250
Specification for maximum
degrees will reduce the
acceptable bore diameter is
press fit and make removal
.7518".
of this seal easirer.
STEP 9.
If bearings are scored, rough,
If the flow control valve
STEP 14.
or show signs of heat dis-
(Item 22) or the relief
coloration the end cover(s)
valve (Item 27) are found
must be replaced.
to be defective they must
be replaced as a unit.
S T E P 10.
Inspect wear plate (Item 10)
Refer to Troubleshooting.
and thrust plate (Item 32)
for wear.
If wear ridge
5-120 INSPECTION.
exceeds .0005" these plates
must be replaced.
Inspect drive and driven
STEP 1.
shaft assemblies (Item 16
STEP 11.
Inspect gear bore walls in
and 17) for roughness in
center section (Item 12)
the sealing and bearing
for excessive wear or score
areas.
marks.
A wear ridge will have
developed at the end of the
Measure drive and driven
STEP 2.
bore where the thrust plate
shafts (Items 16 and 17)
is located.
This wear ridge
Minimum accept-
for wear.
should not exceed 1/32".
able shaft diameter is
.7492".
REASSEMBLY
5-121.
Inspect shaft key for
STEP 1.
STEP 3.
All parts must be thoroughly
excessive wear.
cleaned prior to reassembly
by dipping in solvent and
Inspect gear end faces,
brushing to remove all traces
STEP 4.
outside diameters and
of contamination.
teeth for roughness or
wear.
STEP 2.
Install shaft seal (Item 2),
if it was removed, in front
Measure gear thickness and
STEP 5.
cover with the spring loaded
outside diameter for wear.
lip facing inward.
Force seal
Minimum acceptable gear
into place with a flat steel
width is -4531" and minimum
rod slightly smaller in dia-
gear diameter is 1.7140".
meter than the O. D. of the
seal.
5-92A
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