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SERVICE
&
MAINTENANCE INSTRUCTIONS
I
I
INSPECT PARTS
FOR
WEAR
General
Clean and dry
all
parts.
Remove nicks and burrs from all parts with emery
cloth.
Gear
Assembly
1. Inspect drive gear shaft (6) for broken keyway.
2. Inspect both the drive gear and idler gear shafts
at bearing points and seal area for rough
surfaces and excessive wear.
3.
If
shaft measures less than .873" in diameter in
bearing area, the pump should be replaced.
4. Inspect gear face for scoring and excessive
wear.
5.
If
gear width is below 1.067", pump should be
replaced.
6. Assure that snap rings are in grooves on either
side of drive and idler gears.
7.
.If
edges of gear teeth are sharp, break edge
with emery cloth.
Front
&
Back
Plates
Oil grooves in bearings in both front and back
plates should be
in
line with dowel pin holes and
180' apart. This positions the oil grooves closest
to the respective pin holes.
If
ID of bearings in front plate
or
back plate exceeds
.879",
pump should be replaced.
Bearings in front plate should be flush with islands
in
groove pattern.
Body
Check inside gear pockets for excessive scoring
or
wear.
Pump should be replaced
if
the
ID
(internal
diameter) of the gear pocket exceeds 2.1
07
"
.
REASSEMBLY
1. The thrust plate, diaphragm, back
-
up gasket,
protector gasket, diaphragm seal, shaft seal
and
O
-
rings should be replaced as new parts.
Install O
-
ring (2) in groove in front plate (14).
2.
Tuck diaphragm seal (1 1) into grooves in front
plate with open part of
"V
section down. (Use
dull tool.)
3. Press protector gasket
(10)
and back
-
up
gasket (9) into diaphragm seal.
4.
Drop steel balls (1 3) into respective seats and
place springs (12) over balls.
5.
Place diaphragm
(8)
on top
of
back
-
up gasket,
bronze face up.
6.
Entire diaphragm must fit inside the raised rim
of the diaphragm seal.
7. Dip gear assemblies into oil and slip into front
plate bearings.
8. Install dowel pins
(5)
in body (4).
9.
Apply a thin coat of heavy grease to both milled
faces of body. Slip body over gears onto front
plate (half moon port cavities in body must face
away from front plate). Note small drilled hole
in one of the cavities. This hole must be on
pressure side
of
pump.
10. Install thrust plate
(3), bronze face toward
gears. Side with mid
-
section cut away must be
on suction side of pump. Thrust plate must fit
inside gear pockets.
11. Install O
-
ring (2) in groove in back plate
(1).
12. Slide back plate over gear shafts until dowel
pins are engaged.
13. Install bolts
(1
6
&
17) and tighten evenly
to
40
ft
-
lbs. torque.
14. Work shaft seal over drive gear shaft, taking
care not to cut rubber sealing
lip.
(Oil seal
liberally
before
installing.)
15. Place 1
-
5/1 6
"
O.D. (outside diameter) sleeve
over shaft and seat shaft seal by driving with
plastic hammer.
16.
Rotate pump shaft by hand orwith pliers. Pump
will have small amount
of
drag, but should turn
freely after short period of use.
I
44
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