Front Plate, Backplate
and Adapter Plates Inspection
1. Oil g
roove in bushings in front plate, backplate and
adapter plates should beinline with dowelpin holes and
180 degrees apart. This positions the oilgrooves closest
to respective dowel pin holes.
2. Repla
ce the backplate, front plate or adapter plates
if bushings are worn (Bushings are not available as sep-
arate items).
3. Bushing
s in front plate and backup gasket side of
adapter plates should be flush with face of plate.
4. Check f
or scoring on face of backplate or adapter
plates.
Body I
nspection
1. Check bod
ies inside gear pockets for excessive scor-
ing or wear.
2. Repla
ce bodies if l.D. of gear pockets is worn.
General Information
It i
s important that the relationship of the backplate,
adapter plates, bodies, wear plate and front plate is cor-
rect. You note two half moon cavities in the body which
must face away from the front plate or adapter plate.
Note: The smaller half moon port cavity must be on the
pressure side of the pump. The side of wear plate with
mid section cut out must be on suction side of pump.
Suction side of backplate or adapter plateis the side with
larger port boss.
Reassembly
1. Repla
ce the wear plates (4), seals (6), backup gas-
kets (5), shaft seal (10) and o--rings (1) as new parts.
2. Install o
--rings (1) in groove of front plate (7), adapter
plate (16), and backplate (21) with a smallamount of pe-
troleum jelly to hold in place.
3. Tu
ck backup gasket (5) in front plate (7) and adapter
plate (16) with open part of “V” section down.
4. Pla
ce balance pressure seal (6) in groove in front
plate (7) and adapter plate (16).
5. Apply a t
hin coat of petroleum jelly to both milled gear
pockets of front body (2). Slip body onto front plate (7)
with half moon port cavities in body facing away from
front plate.
NOTE: T
he small half moon port cavity must be on the
pressure side of pump.
6. Pla
ce wear plate (4) on top of backup gasket (5) with
bronze face up. The side with the mid section cut away
must be on suction side of pump.
7. Dip
drive gear assembly (3) and idler gear assembly
(13) in
to oil. Slip both gear assemblies into gear pocket
of front body (2) and into front plate bushings.
8. Pla
ce wear plate (4) on top of backup gasket (5) with
bronze face up. The side with the mid section cut away
must be on suction side of pump.
9. Install adap
ter plate (16) in place on front body (2).
Check positioning marks.
10. Install r
ear body (2) onto adapter plate (16).
11. Install k
ey (15) in slot of drive gear shaft (3). Dip slip
fit gear (13) in oil and slip on shaft and into gear pocket
of rear body (2). Check key for proper alignment.
12. Dip idle
r gear (13) in oil and install in gear pocket of
rear body (2).
13. Position
backplate (21) over shafts until dowel pins
in body are engaged.
14. Secure w
ith cap screws (9) and washers (8). Tighten
cap screws evenly in a crisscross pattern to 25 to 28 ft--
Ibs. [34 to 38 Nm] torque.
15. Pla
ce washer (11) over drive shaft into housing. Lib-
erally oil shaft seal (10) and install over drive shaft care-
fully so that rubber sealing lips are not cut.
16. Pla
ce a sleeve over shaft and press in shaft seal (10)
.20 in. (5.08mm) below front surface of front plate.
Repairs
P
age 4 -- 39.3
Rev. C
Groundsmaster 455--D
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